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Issue: Vol. 649 No. 3: 21 May 2024
Type: Article
Published: 2024-05-21
DOI: 10.11646/phytotaxa.649.3.2
Page range: 252-260
Abstract views: 272
PDF downloaded: 2

Psychotria pendens (Rubiaceae, Psychotrieae), a new ultramafic species from Central Palawan, Philippines

Center for Conservation Innovations Ph, Inc., Alabang, Muntinlupa City 1770, Philippines
Biophysical Sciences Department, College of Sciences, Palawan State University, Tiniguiban Heights, Puerto Princesa, Palawan 5300, Philippines
Philippine Taxonomic Initiative, Inc., Angeles City, Pampanga, 2900 Philippines
Philippine Taxonomic Initiative, Inc., Angeles City, Pampanga, 2900 Philippines
Psychotria Malesia Mt. Victoria Palawan Eudicots

Abstract

Psychotria pendens from the lowland ultramafic forest of Mt. Victoria, Palawan Island, Philippines is herein described as a new species of Rubiaceae. The new species is morphologically similar to P. rubiginosa (Gitingensis species group) by having monochotomous inflorescence and oblanceolate to oblong-elliptic leaves but is distinguished by its large, leaf-like, valvate stipules with biattenuate to biacuminate tips, pendent inflorescence, glabrous abaxial leaf surface, narrowly triangular bracts, and glabrous calyx. Molecular analysis revealed that this newly discovered species belongs to the Pacific Psychotria clade, and is allied to the Philippine species P. luzoniensis and Hawaiian species P. mariniana. The species is assessed as Critically Endangered (CR) based on the IUCN Red List categories and criteria.

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