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Issue: Vol. 437 No. 2: 25 March 2020
Type: Article
Published: 2020-03-25
DOI: 10.11646/phytotaxa.437.2.7
Page range: 113–117
Abstract views: 26
PDF downloaded: 2

A new species of Argostemma (Rubiaceae) with free stamens in star-shaped corolla from the Philippines

The Graduate School and Research Centre for the Natural and Applied Sciences, University of Santo Tomas, España Blvd., 1015 Manila, Philippines. Department of the Biological Sciences, College of Science, University of Santo Tomas, España Boulevard, 1015 Manila, Philippines.
Department of the Biological Sciences, College of Science, University of Santo Tomas, España Boulevard, 1015 Manila, Philippines.
The Graduate School and Research Centre for the Natural and Applied Sciences, University of Santo Tomas, España Blvd., 1015 Manila, Philippines. Department of the Biological Sciences, College of Science, University of Santo Tomas, España Boulevard, 1015 Manila, Philippines. epartment of Plant Systematics, University of Bayreuth, Universitätstr. 30, D-95440 Bayreuth, Germany.
epartment of Plant Systematics, University of Bayreuth, Universitätstr. 30, D-95440 Bayreuth, Germany.
Argostemma free stamens Philippine endemic Eudicots

Abstract

Argostemma separatum, a new species with free stamens in star-shaped corolla from Mt. Halcon Oriental Mindoro, Philippines is here described and compared with Argostemma diversifolium, the only species of the genus with this type of flower. This species is distinct from A. diversifolium by its indumentum on stem, leaf blades and calyx, smaller leaf blades, fewer flowered inflorescences, shape of stipule and calyx, red tips on corolla lobes, and color of anthers. Based on the recent IUCN categories, the conservation status of A. separatum is Data Deficient (DD) since it was only collected at the type locality.