Pseuderanthemum multiflorum (Acanthaceae), a new species known only from Thailand, is here described and illustrated. It is distinguished from P. graciliflorum by inner corolla tube and pistil being glabrous instead of puberulous and by calyx lobes 4.5–6 mm long instead of 3–4 mm long. Comparison of morphological characteristics are provided.
Two new species, Rhododendron trichopetalum and R. yalaense, from Peninsular Thailand, are described and illustrated. Three new records of R. jasminiflorum, R. klossii and R. robinsonii are newly reported for Thailand, and R. klossii is herein reinstated. Lectotypifications were designated where required and an updated key to species, modified from the Flora of Thailand, is provided.
Lithocarpus is a major Asian endemic genus of (sub)tropical trees found throughout the region. The nearly 350 species can be difficult to identify in the absence of good fruiting material, often leading to confusion and misidentification. Once recognized as a distinct species, Lithocarpus longispinus is currently a heterotypic synonym of Lithocarpus wrayi. Following careful examinations and comparisons of herbarium specimens throughout the distribution range, along with in situ collections, we find distinct morphological differences between the two species. Here we define the diagnostic morphological traits, provide a complete description of the species along with an initial conservation assessment and propose the reinstatement of L. longispinus.
The new species Henckelia moniliformis (Gesneriaceae) is described from North-Eastern Thailand. A key to the species of Henckelia in Thailand is provided, along with illustrations, notes on the ecology and the IUCN conservation status of the new species.
Two new species, Greenea laotica (Rubiaceae) and Palaquium laoticum (Sapotaceae), are described based on specimens collected from the Nam Kading National Protected Area and its vicinity in central Laos. In addition, six taxa of angiosperms are reported as new records for the flora of Laos: Lonicera macrantha (Caprifoliaceae), Heritiera angustata, Heritiera parvifolia (Malvaceae), Olax imbricata (Olacaceae), Pellacalyx yunnanensis (Rhizophoraceae), Psychotria bonii (Rubiaceae), and Pouzolzia zeylanica var. calcicola (Urticaceae). For each species, voucher specimens are cited, photographs are shown and additional information including geographical distribution, ecology and taxonomic notes are provided. Lectotype is proposed for Olax imbricata.
