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Polypodiaceae s.l. (Lidsaeaceae)

Lindsaea javanensis Blume

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial fern on open wet steep slope along trail. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1526.

Convallariaceae

Peliosanthes sinica F.T. Wang & Tang

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb on shady very steep stream slope. Locally common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1525.

Oleaceae

Chionanthus ramiflorus Roxb.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree 15-20 m tall on very steep stream slope. Fruits almost black. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1524.

Melastomataceae

Sonerila plagiocardia Diels

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Lithophytic herb on vertical shady mossy bluff along rocky stream. Leaves pale green, dull purple below. Flowers pale pink-purple, anther yellow. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1523.

Polypodiaceae s.l. (Lidsaeaceae)

Lindsaea javanensis Blume

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial fern on steep open wet slope along trail. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1522.

Hamamelidaceae

Rhodoleia championii Hook.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree 15-20 n tall on steep slope. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1521.

Smilacaceae

Smilax lanceifolia Roxb.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Woody vine 3-4 m long in open place along trail. Flowers light green. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1520. Det.: Pan Li 10.12.2019

Meliaceae

Trichilia connaroides (Wight & Arn.) Bentv.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree about 15 m tall on steep rocky slope along trail. Fruits dull green. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1519.

Polypodiaceae s.l. (Lendsaeaceae)

Odontosoria chinensis (L.) J. Sm.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial fern on very steep rocky open slope along trail. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1517.

Polypodiaceae s.l. (Marattiaceae)

Angiopteris danaeoides Z.R. He & Christenh., aff. ( = Archangiopteris caudata Ching)

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial fern on very steep rocky shady slope. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1515.

Begoniaceae

Begonia versicolor Irmsch.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial rosulate rhizomatous herb on steep shady slope. Leaves above dark green to purple, often with palmate spots, below dark purple. Flowers pink, anthers yellow. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1514.

Fabaceae (Mimosoideae)

Archidendron laoticum (Gagnep.) I.C. Nielsen?

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree to 25 (30) m tall. Fruits 1-4 seeded, pod dull brown, to 20 cm long and 5 cm in diameter, seeds brown mottled with light brownish. Common. One of the forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1513. Det.: Sawai Mattapha 29.11.2019

Rubiaceae

Ophiorrhiza sp.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb to 1 m tall on steep shady rocky river slope. Flowers white. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1512.

Melastomataceae

Sonerila mollissima Aver., sp. nov.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb in open steep wet shady slope along trail. Flowers light pink-purple, anthers yellow. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1510.

Urticaceae

Boehmeria clidemioides Miq.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb or undershrub to 1 m tall in open place along trail. Inflorescences dull green. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1509. Det.: Fu Longfei 09.12.2019

Musaceae

Musa splendida A. Chev.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Giang herb to 3 m tall on very steep open slope along rocky river. Inflorescence bracts purple, flowers yellow. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1508. Det.: Jana Skornickova 10.12.2019

Polypodiaceae s.l. (Cibotiaceae)

Cibotium barometz (L.) J. Sm.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Woody fern on open steep slope along trail. Stem 0.5 m tall, fronds to 3 m long. Very common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1507.

Polypodiaceae s.l.

Haplopteris elongata (Sw.) E.H. Crane

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Epiphyte on old mossy tree, leaves pendulous, to 1.5 m long. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1506.

Polypodiaceae s.l. (Dryopteridaceae)

Peranema aspidioides (Blume) Mett.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial ferb on open shrubby place on steep stream slope. Fronds to 1.2 m long. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1505.

Araliaceae

Aralia armata Seem.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Scandent shrub on open shrubby place on steep stream slope. Flowers light greenish, fruits black. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1504.

Commelinaceae

Floscopa scandens Lour.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb in open rocky place along stream. Flowers pinkish. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1503.

Polygalaceae

Salomonia cantoniensis Lour.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb in open wet grassy place along trail. Flowers pink-violet. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1502.

Polypodiaceae s.l. (Thelipteridaceae)

Cyclosorus subpubescens (Blume) Ching

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial fern on very steep wet shady slope. Fronds to 2 m long. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1501.

Rubiaceae

Schizomussaenda dehiscens (Craib) H.L. Li

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Treelet 6-8 m tall on open steep river slope. Inflorescence bract pure white. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1540.

Melastomataceae

Pseudodissochaeta septentrionalis (W.W. Sm.) Nayar

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Scandent shrub to 3 m tall on open steep river slope. Fruits black. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1541 (LE 01067136).

Magnoliaceae

Magnolia hookeri (Cubitt & W.W. Sm.) D.C.S. Raju & M.P. Nayar var. longirostrata D.X. Li & R.Z. Zhou

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Treelet 6-8 m tall on open steep river slope. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1542. Det.: N.T. Hiep 30.11.2019

Fagaceae

Castanopsis fissa Rehder & E.H. Wilson

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree 20-25(30) m tall. Common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1543.

Loranthaceae

Taxillus umbellifer (Schultes) Danser

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Parasitic undershrub on canopies of Betula alnoides. Shoots to 1.5 m long, flowers orange-red, tepal apices dark green. Locally very common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1544 (LE 01067140).

Orchidaceae

Tainia cordifolia Hook.f.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Creeping herb on steep shady river slope. Leaves dark green. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1545.

Urticaceae

Pouzolzia hirta (Blume) Hassk.

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Terrestrial herb in open grassy place along trail. Flowers light green to light pinkish. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1546 (LE 01067139).

Fabaceae s.l. (Mimosoideae)

Archidendron balansae (Oliv.) I.C. Nielsen

Ha Giang Prov., Quan Ba Distr., Thai An Commune, Seo Lung Two Village, around point 22.96988ºN 105.08646ºE. Very steep mountain slopes composed of stratified shale and clayey subsoil at elevation 800–1000 m a.s.l. Primary and secondary evergreen broad-leaved humid forest. Tree to 30 m tall on steep mountain slope. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1547 (LE 01067138, LE 01067135). Det.: Sawai Mattapha 29.11.2019

Convallariaceae

Aspidistra obliqua K.S. Nguyen & Aver., sp. nov.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial rhizomatous herb in shady place among rocks. Leaves rigid, velvety dark green with unclear yellowish spots, pale green below. Flowers almost entirely black, stigma at apex yellow, below black. Not common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1548 (holotype – LE 01067134, isotype – HN).

Begoniaceae

Begonia sp.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial and lithophytic rhizomatous herb in shady place among rocks. Leaves dark green above, light pale green below, petioles dull dirty purple. Flowers white with light pink tint. Locally very common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1549.

Begonia longa C.-I Peng & W.C.Leong, 2014, in Ching-I Peng et al., Botanical Studies 55: 8 (Two new species of Begonia sect. Coelocentrum, B. guixiensis and B. longa, from Sino-Vietnamese limestone karsts)

TYPE: VIETNAM. Ha Giang Province, Quan Ba District, Can Ty Community, Sin Suoi Ho Village, elev. 650–1500 m; on face of limestone rock, in shaded and moist broadleaf forest on mountain slope. Locally frequent. Living collection made on 12 Nov 2004; type specimens (in flower) pressed from plants cultivated in the experimental greenhouse, Academia Sinica, 10 May 2007. Ching-I Peng, Wai-Chao Leong, Shin-Ming Ku, Tien Hiep Nguyen, Van The Pham & Xuan Tam Nguyen 20076-A (holotype: HAST; isotypes: A, E, FRIM, MO, P).

Ebenaceae

Diospyros curranii Merr.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Tree 10-15 m tall. Fruits light dull brownish. Common. Timber of a good quality. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1550.

Convallariaceae

Ophiopogon tonkinensis L. Rodr.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial herb in shady place among rocks. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1551.

Convallariaceae

Aspidistra sp.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial rhizomatous herb in shady place among rocks. Leaves dark green with many unclear yellowish spots (sometime uniform green). Old flowers looks black. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1552.

Orchidaceae

Bulbophyllum tipula Aver.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Creeping epiphyte on old mossy tree. Occasional.

11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1553.

Sterculiaceae

Sloanea mollis Gagnep.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Tree 15-20 m tall. Young fruits light green, old fruits brown, with soft hairs. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1554.

Polypodiaceae s.l. (Aspleniaceae)

Asplenium dianguiense X.C. Zhang

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial and lithophytic fern on steep rocky slope. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1555.

Orchidaceae

Odontochilus elwesii C.B.Clarke ex Hook.f.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Creeping terrestrial herb in shady rocky place. Leaves uniform glossy dark purple. Not common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1556.

Euphorbiaceae

Phyllanthus elegans Wall.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Shrub 2-3 m tall in open place. Fruits light yellowish-green. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1557.

Rubiaceae

Spiradiclis sp.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial herb or undershrub to 1 m tall in open rpcky place. Flowers purple. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1558.

Fagaceae

Quercus glauca Thunb.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Tree 7-10 m tall on mountain top. Seeds glossy green. Not common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1559.

Orchidaceae

Coelogyne fimbriata Lindl.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Creeping epiphyte and lithophyte. Flowers dull yellowish, lip with brown center. Very common.

11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1560.

Orchidaceae

Bulbophyllum apodum Hook.f.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Creeping epiphyte and lithophyte. Common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1561.

Orchidaceae

Bulbophyllum macraei Rchb.f.?

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Creeping epiphyte and lithophyte. Common. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1562.

Orchidaceae

Thelasis khasiana Hook.f.

Ha Giang Prov., Quan Ba Distr., Can Ty Commune, Sin Suoi Ho Village, around point 23.09566ºN 105.02142ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800–1000 m a.s.l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Clustering epiphyte on old mossy tree. Occasional. 11 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1563.