Open AccessA new Philippine species of Ridsdalea (Rubiaceae, Ixoroideae) from karst vegetation in Palawan
Author(s) -
Rene Alfred Anton Bustamante,
Pieter B. Pelser
Publication year - 2022
Publication title -
blumea
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.476
H-Index - 25
eISSN - 2212-1676
pISSN - 0006-5196
DOI - 10.3767/blumea.2022.67.01.04
Subject(s) - rubiaceae , karst , biology , key (lock) , vegetation (pathology) , stamen , botany , apex (geometry) , taxonomy (biology) , ecology , pollen , paleontology , medicine , pathology
Ridsdalea philippinensis ( Rubiaceae ), a new species from the karst forest in El Nido (Palawan, Philippines), is described and illustrated. It is unique among Malesian Ridsdalea species in having a corolla tube that is distinctly inflated at the apex, a character state also displayed by R. sootepensis and R. thailandica from Laos and Thailand. Amongst others, R. philippinensis , however, differs from both of these species in having smaller flowers and anthers that do not emerge from the corolla tube. An updated key for Philippine Ridsdalea is also presented.