ABSTRACT
Polyalthia kanchanaburiana S. Khumchompoo & A. Thongpukdee is newly described from Thailand. It differs from Polyalythia micrantha most notably in its scandent habit, in a number of floral features including many more carpels 8–20 as opposed to 1–9 and a clavate not globose stigma and in its oblong-lanceolate leaf and acuminate leaf apex.
Keywords: Polyalthia, Annonaceae, Thailand
Polyalthia kanchanaburiana S. Khumchompoo & A. Thongpukdee, sp. nov. P. micrantha aqua foliis oblongo-lanceolatis (non oblongo-ovatis) apicibus acuminatis (non acutis), floribus solitariis terminalibus vel fasciculo 2–3-floribus, foliis oppositis, terminalibus vel caulifloris (non nisi solitariis), petalis exterioribus parvioribus (adversum aequimagna), carpidiis 8–19 (adversum 1–9), ovulis 3(1) (non 1–2), stigmate clavato (non globoso) et appendice staminis truncata (non cylindrica) differt.
Typus: Thailand, Kanchanaburi, Ban Rai, Queen’s crab swamp forest, Thongpaphum National Park, 21 Nov. 2003, Khumchompoo & Thongpukdee 36 –1 (holotypus BKF; isotypi CMU, K, KKU, L). Figs. 1–4.
Ecology.— Scattered in Queen’s crab swamp forest (Phu Pu Rachini), 400–600 m. altitude.
Phenology.— Flowering in May–June. Fruiting in June–November or possibly throughout the year.
Etymology.— Polyalthia kanchanaburiana is named after the type locality.
Notes.— Polyalthia kanchanaburiana is very similar to P. micrantha but differs in having 8–20 carpels, (1–)3 ovules, a clavate stigma, a truncate staminal appendage, unequal whorled petals and an acuminate leaf apex.
Khumchompoo S, Thongpukdee A. 2005 Polyalthia kanchanaburiana (Annonaceae): a new species from Thailand. Thai Forest Bull., Bot. no.33. 35-41: http://web3.dnp.go.th/botany/PDF/TFB/TFB33/TFB33_6Polyalthia.pdf
