New rare and threatened species of Peponidium and Pyrostria (Rubiaceae, Vanguerieae) from the drylands of Madagascar

被引：0

作者：

Klackenberg, Jens ^{[1
]}

Razafimandimbison, Sylvain G. ^{[1
]}

机构：

[1] Swedish Museum Nat Hist, Dept Bot, Box 50007, S-10405 Stockholm, Sweden

来源：

CANDOLLEA | 2024年 / 79卷 / 01期

关键词：

RUBIACEAE; Vanguerieae; Peponidium; Madagascar; Pyrostria; New species; EVOLUTION; GENUS;

D O I：

10.15553/c2024v791a3

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Four new species of the tribe Vanguerieae ( Rubiaceae ) from southern, southwestern and western Madagascar are described and illustrated. Two species belong to the genus Pyrostria Comm. ex Juss.: P. costata Klack. & Razafim. with small leaves and distinctly ribbed pollen presenters and fruits, and P. macrocarpa Klack. & Razafim. characterized by its large, obconical, 5 - 6-lobed fruits. The other two species belong to the Malagasy subendemic genus Peponidium Ar & egrave;nes: P. leroyi Klack. & Razafim., characterized by hairy leaves with ciliate margins, sparsely pubescent flowers and ribbed pollen presenters, and P. sessile Klack. & Razafim., distinct by its cordate almost sessile leaves and double-tipped corolla lobes. Risk of extinction assessments for all four species are presented, as well as the respective distribution maps.

引用

页码：53 / 62

页数：10

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