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We herein describe a new species,    Panax   siamensis    J. Wen, from the tropical monsoon forests in northern Thailand.    Panax   siamensis    is characterized by a combination of characters including horizontally elongated rhizomes with thick internodes, 3–5 whorled leaves each with 7–9 sessile and lanceolate leaflets, lanceolate bracteoles not persisting at the fruiting stage, 2-locular ovaries, and red fruits with a black top. The new species is most closely related to    Panax   zingiberensis    C.Y. Wu &amp; Feng from southeastern Yunnan province of China, sharing the character of sessile leaflets, but differing in that    P.   siamensis    has well developed, elongated rhizomes (vs. compact, ginger-like rhizomes and rootstock in    P.   zingiberensis   ), and 7–9 leaflets (vs. (3–) 5–7 leaflets in    P.   zingiberensis   ). We also compare    Panax   siamensis    to other related Asian    Panax    species, including    P.   assamicus    Banerjee,    P.   bipinnatifidus    Seem.,    P.   pseudoginseng    Wallich, and    P.   vietnamensis    Ha &amp; Grushv. The new taxon is preliminarily assessed as Vulnerable ( VU  D2), according to the IUCN Red List criteria. A taxonomic key is provided to facilitate the identification of    P.   siamensis    and its close allies.

﻿ Panax siamensis J. Wen, a new species of the ginseng genus ( Panax , Araliaceae ) from northern Thailand

Panax siamensis J. Wen, a new species of the ginseng genus ( Panax , Araliaceae ) from northern Thailand