Three new taxa, Tupistra gracilis, Peliosanthes griffithii var. breviracemosa and P. hirsuta, are described and illustrated. The first two taxa are local endemics of northern Vietnam and the last species is endemic to karstic limestone areas of central Laos. Tupistra fungilliformis and P. yunnanensis are recorded for the first time for Vietnam. A recently described species T. patula from northern Vietnam is supplemented with new data on its morphology, ecology and distribution.
Peliosanthes hirsuta Averyanov & N.Tanaka, sp. nov.
Local endemic to central Laos. It distributes in the primary and secondary broad-leaved evergreen forests on rocky, highly eroded, crystalline limestone at elevation 700–1000 m a.s.l. the species is terrestrial or lithophytic herb on shady rocky slopes. Flowering in November–December.
Peliosanthes griffithii Baker var. breviracemosa Averyanov & N.Tanaka, var. nov.
Endemic to northern Vietnam, found in Cao Bang province, Nguyen Binh district.
This is terrestrial and lithophytic herb on shady slopes covered with primary coniferous forest with Pseudotsuga sinensis on highly eroded rocky limestone near ridge top at elevation about 1300 m a.s.l. Not common. Flowering October–November.
Peliosanthes yunnanensis F.-T.Wang & Tang in Chang
New record for Vietnam's flora, found in Lao Cai province, Sapa town Area.
It is terrestrial herb on shady slopes covered with primary broad-leaved evergreen forests on sandstone, granite and quartzite at elevation 1500–2200 m a.s.l.; locally very common. Flowering October–December.
Tupistra fungilliformis F.T.Wang & S.Yun Liang in Liang
New record for Vietnam's flora, found in Cao Bang (Bao Lac district), Ha Giang (Bac Me, Meo Vac and Quan Ba districts), Lao Cai (Bat xat district), Son La (Thuan Chau district) and Thanh Hoa (Yen Dinh district).
It distributes in the primary and old secondary broad-leaved and coniferous humid forests (with Fokienia, Nageia, Pinus, Podocarpus, Pseudotsuga, Tsuga and Xanthocyparis) preferably on highly eroded rocky limestone, rarely on shale and sandstone, at elevations (100)1000–1800(2000) m a.s.l. It is large epiphytes or clustering lithophytes, rarely terrestrial herbs, common on moist rocky steep slopes, often on exposed mossy rocks near mountain tops or
along streams in ravines. Rare. Flowering October–February.
Tupistra gracilis Averyanov & N. Tanaka, sp. nov.
New species, Local endemic of northern Vietnam, found in Thuong Xuan district, Thanh Hoa province.
It distributes in the primary and secondary broad-leaved evergreen forests on rocky, highly eroded, crystalline limestone at elevations 800–1000 m a.s.l. Terrestrial and lithophytic herb on shady rocky steep limestone slopes. Plant sometimes grows on ground of rocky slopes covered by rather open forests and in large pockets filled with soil, namely not truly epilithic. Flowering in November–December.
Supplemental data for Tupistra patula Aver., N. Tanaka & K. S. Nguyen.
The species was published on Nordic Journal of Botany, 34(1): 23-37, in this article, the species was provided supplemental data.
Local endemic to northern Vietnam, found in Ha Giang province, Bac Me & Quan Ba districts.
It distributes in the primary and secondary evergreen broad-leaved, mixed and coniferous forests (with Xanthocyparis vietnamensis, Nageia fleuryi, Pseudotsuga sinensis, Calocedrus rupestris) on rocky solid highly eroded karstic limestone at elevations 1100–1300 m a.s.l. Lithophytic herb on mossy rocks on rocky steep slopes, often in shady and humid places. Flowering in October–December.
The articles would be found in https://biotaxa.org/Phytotaxa/issue/view/phytotaxa.312.2