Гербарий БИН РАН - Образцы

FLORA OF VIETNAM

Orchidaceae

Liparis viridiflora (Blume) Lindl.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Clustering epiphyte and lithophyte on mossy slope. Common. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 151 (HN).

FLORA OF VIETNAM

Orchidaceae

Dendrobium nobile Lindl.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Clustering epiphyte on mossy tree. Not common. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 147.

Orchidaceae

Podochilus khasianus Hook.f.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Clustering lithophytic (or occasionally epiphytic) herb on vertical shady mossy cliff. Not common. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 145 (HN, LE01058118 – photo).

FLORA OF VIETNAM

Orchidaceae

Paphiopedilum henryanum Braem

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Lithophytic rosulate herb on vertical mossy shady cliff. Not common. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 143 (HN).

FLORA OF VIETNAM

Orchidaceae

Cymbidium lancifolium Hook.

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point 23º05ʹ26.3ʺN 105º01ʹ03.0ʺE, 1100-1150 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Terrestrial herb among shady rocks. Flower buds dull pink-purple. Not common. 14 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 140 (HN, LE01058117 – photo).

FLORA OF VIETNAM

Orchidaceae

Dendrobium chittimae Seidenf.

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1100-1200 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on very steep rocky slopes. Terrestrial and lithophytic herb on open mossy, very steep rocky slope. Flowers white, lip with yellow center and pinkish basal half. Occasional. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 086 (HN, LE01058107 – photo).

FLORA OF VIETNAM

Orchidaceae

Pomatocalpa spicatum Breda, Kuhl & Hasselt

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1000-1200 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary and partially degraded evergreen broad-leaved humid forest on rocky mountain slopes. Epiphyte on mossy tree. Occasional. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 082 (HN, LE01058106 – photo).

FLORA OF VIETNAM

Orchidaceae

Bulbophyllum longibrachiatum Z.H. Tsi

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1100-1200 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on very steep rocky slopes. Creeping lithophytic herb on exposed mossy rocks, or occasionally epiphyte on mossy rocks near mountain top. Leaves purple-violet below. Not rare. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 048 (HN, LE01058088).

FLORA OF VIETNAM

Orchidaceae

Liparis mannii Rchb.f.

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1100-1290 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen coniferous humid forest with Pseudotsuga sinensis on rocky mountain tops and ridges. Lithophytic herb on open mossy rocks on mountain top. Common.

13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 039 (HN, LE01058082 – photo).

FLORA OF VIETNAM

Orchidaceae

Oberonia ensiformis (Sm.) Lindl.

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1100-1290 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen coniferous humid forest with Pseudotsuga sinensis on rocky mountain tops and ridges. Lithophytic herb on vertical shady cliff. Old flowers yellowish. Occasional. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 037 (HN, LE01054067).

FLORA OF VIETNAM

Orchidaceae

Coelogyne dolichopoda Aver. & K.S. Khang

Ha Giang prov., Quan Ba distr., Bat Dai Son commune, Bat Dai Son Nature Reserve, San Chu village, around point 23º08ʹ55.1ʺN 104º59ʹ45.7ʺE, 1100-1290 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen coniferous humid forest with Pseudotsuga sinensis on rocky mountain tops and ridges. Creeping lithophytic vine to 1.5 m long with large erect pseudobulbs. Flowers yellowish. Locally very common. 13 April 2018, L. Averyanov, Nguyen Sinh Khang, Chuong Quang Ngan, T. Maisak, VR 027 (holotype – LE01050357, isotype – HN, LE01050470).

Orchidaceae

Dimymoplexis micradenia (Rchb.f.) Hemsl.

Hoa Binh, Lac Thuy, Phu Lao, bamboo forest at base and slopes of limestone mountains, around point 20.55658oN, 105.74669oE, at elevation of 50-70 m a.s.l.

Leafless and achlorophyllous terrestrial herbs about 10-25 cm tall, single or branching one to twice time, flower dull white to brownish white, lip tinted with orange spots, fruit light brown, locally common.

9 May 2019, Nguyen Sinh Khang et al., NSK 1282.

Orchidaceae

Coelogyne schultesii S.K. Jain & S. Das

Son La province, Quynh Nhai district, Muong Giang commune, Remnant primary evergreen broad-leaved forest on limestone mountains, at top of mountain, around point 21.63116° N 103.55614° E, at elevation of 1180 m a.s.l. Lithophytic and epiphytic herb about 25-30 cm tall, flower yellowish orange and dark red, locally common.

March 2019, Nguyen Sinh Khang et al., NSK 1173

Orchidaceae

Eria boniana (Gagnep.) Tang & F.T. Wang

Ha Giang prov., Quan Ba distr., Bat Dai Son Nature Reserve, Can Ty commune, Dau Cau 1 village, around point N 23.08650º E105.02312º, elevation of 750-900 m a.s.l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved humid forest on steep rocky slopes near mountain tops. Lithophytic herb about 15-20 cm, flower dull yellowish white, lip with purple wrinkles, common, 14 March 2019, Nguyen Sinh Khang et al., NSK 1207.

Orchidaceae

Coelogyne flaccida Lindl.

Son La province, Quynh Nhai district, Muong Giang commune, Remnant primary evergreen broad-leaved forest on limestone mountains, at top of mountain, around point 21.63116° N 103.55614° E, at elevation of 1180 m a.s.l.

Lithophytic herb about 25-30 cm tall, flower dull white, lip tinted with yellow patch inside, locally common.

March 2019, Nguyen Sinh Khang et al., NSK 1172

Orchidaceae

Bulbophyllum repens Griff.

Son La province, Muong La district, Muong La N.R. Remnants of primary evergreen broad-leaved forest along streams at the base and slope of sandstone mountain, around point 21.61277° N 104.10162° E, at elevation of 1390 m a.s.l. Terrestrial herb about 1 m tall, flower white blue, not common, March 2 2019, Nguyen Sinh Khang, Nguyen Duc Thang et al., NSK 1154

Orchidaceae

Collabium chinense (Rolfe) Tang & F.T.Wang

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 creeping herb on very steep shady river slope. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1539.

Melastomataceae

Phyllagathis 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 and lithophytic rosulate rhizomatous herb on wet steep shady stream slope. Leaves above dark green, below pale green. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1538.

May be new species

Fagaceae

Castanopsis kawakamii Hayata

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. Very common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1537.

Ericaceae

Pieris 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. Tree 8-10 m tall in rather open place of on steep slope. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1536 (LE 01067137).

May be new species.

Fagaceae

Lithocarpus vestitus (Hickel & A. Camus) A. Camus

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. Very common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1535.

Fagaceae

Lithocarpus litseifolius Chun

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. Very common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1534.

Theaceae

Eurya acuminata DC.

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 or shrub 3-4 m tall in open place along trail. Flowers buds white. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1533.

Fagaceae

Castanopsis harmandii Hickel & A.Camus

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. Very common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1532.

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. Very common. Usual forest co-dominant. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1531.

Balanophoraceae

Balanophora laxiflora Hemsl.

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. Achlorophyllous ground pale reddish root parasite on shady steep stream slope. Not common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1530.

Fagaceae

Lithocarpus microspermus A. Camus

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 m tall. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1529.

Melastomataceae

Sonerila annamica Guillaumin

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 on steep shady slope along trail. Flowers buds light pink. Occasional. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1528.

Polypodiaceae s.l. (Athyriaceae)

Diplazium crassiusculum 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 steep shady slope. Common. 10 October 2019, L. Averyanov, Nguyen Sinh Khang, T. Maisak, VR 1527.

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.