Impatiens karenensis (Balsaminaceae), a new tiny flowered species from Myanmar

Impatiens karenensis (I. sect. Semeiocardium) from Kayin State, Myanmar is described and illustrated here. It is most similar to I. micromeris, but differs in having lower petals with outer margins strongly undulate in the lower half (vs. lower petals entire), apex of upper petals acute to obtuse (vs. apex rounded), short stout spur, ± as long as the depth of lower sepal, ca. 2.5 mm long (vs. long attenuate spur, twice as long as the depth of lower sepal, ca. 5 mm long). Its conservation status is also assessed as Critically Endangered

Bulbophyllum romklaoense (Orchidaceae), a new species from Thailand

Bulbophyllum romklaoense (B. sect. Lemniscata) from northern Thailand is described and illustrated as a species new to science. It is most similar to B. muscarirubrum and B. triste, but differs by having inflorescences with only 4–6 reddish-brown flowers, falcate-subovate lateral sepals that are connate only in the upper half along the interior margins, petals with erose to fimbriate margins and a lip with long cilia in the distal half on the lower surface. A comparison with other similar species in the section, as well as notes on ecology, phenology, conservation assessment and a key to B. sect. Lemniscata in Thailand are also provided

A new record of Impatiens kamtilongensis Toppin (Balsaminaceae) for Vietnam flora

Impatiens kamtilongensis Toppin (Balsaminaceae), collected from Xuan Lien district, Thanh Hoa province is reported here as a new record for the flora of Vietnam. I. kamtilongensis can be distinguished from its closest ally I. finetii by its hairy white stem, yellow flowers having 2 red blotches, bigger sepals and glabrous capsule. The specimens are deposited in the Herbarium of the Institute of Ecology and Biological Resources (HN) Ha Noi, Vietnam. Morphological redescription and illustrations are provided along with notes on distribution, ecology, phenology and conservation of the species

An overview of floral and vegetative evolution in the Asian clade of Bulbophyllum (Orchidaceae)

Background and aims – Bulbophyllum, the largest genus in Orchidaceae, exhibits a diverse morphology in both reproductive and vegetative characters. While trait diversity and evolution has been extensively studied in Malagasy species and within the Cirrhopetalum alliance clade, the evolution of reproductive and vegetative characters at the whole level of the Asian clade remains largely unexplored. Material and methods – We reconstructed the phylogeny of approximately 11% of all Asian Bulbophyllum species using Bayesian inference and maximum likelihood estimation based on nuclear (ITS) and chloroplast (matK, psbA-trnH) DNA sequence data. This phylogenetic framework allowed us to examine the evolution of two vegetative and four floral characters through ancestral state reconstruction. Key results and conclusion – The ancestral character states of the Asian clade of Bulbophyllum include a single leaf, distinct pseudobulbs, multiple-flowered inflorescences, and lateral and dorsal sepals similar in length. One-leaved pseudobulbs evolved into two-leaved pseudobulbs multiple times. Distinct pseudobulbs gave rise to indistinct pseudobulbs twice. Multiple-flowered inflorescences shifted to solitary flowers and 2–3-flowered inflorescences multiple times, with some instances of evolutionary reversal. Lateral sepal elongation also presents a convergent evolutionary scenario

A New Species of Adiantum (Pteridaceae) from Thailand

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Two New Species of Impatiens (Balsaminaceae) from North of Lao PDR

Impatiens gadellae Souvann. & Suksathan, Impatiens nurae Souvann. & Suksathan, two new species from North Lao PDR, are described and illustrated with conservation statuses propose

Notes on the Orchid Flora of Thailand (II)

Three orchid species are newly recorded for the flora of Thailand. The discovery of Macodes petola in the southern part of Peninsular Thailand, adjacent to known occurrences across the Malaysian border, was expected. On the other hand, the find of Cheirostylis octodactyla in Thailand considerably extended the known range of this species to the west, as it was previously known only from the northern part of the Philippines, Taiwan and (through a single collection) from northern Vietnam. The recent discovery of populations of Zeuxine bidupensis in Thailand suggests that this species, hitherto considered endemic to Vietnam, does not only have morphological, but also geographic affintities to the little known Z. pantlingii from West Bengal

Impatiens jenjittikuliae (Balsaminaceae), a new species from Thailand

Impatiens jenjittikuliae Ruchis. & Suksathan, a new species from a limestone area in Thasongyang District, Tak Province, Northern Thailand, is described and illustrated. This endemic new species is distinguished from the most similar, I. lacei Hook.f. through having pilose lateral sepals vs glabrous, and by the absence of long hairs along the lamina margin. Its pollen and seed morphology, stem anatomy, and pollination ecology are also observed. Furthermore, its conservation status as Critically Endangered is also assessed