A new tiny-leaved species of Raveniopsis (Rutaceae) from the Pakaraima Mountains of Guyana

By

Wurdack, Kenneth John

Type

Article

Date of Publication

2017

Original Publication

PhytoKeys

Volume

91

Pages

1-12

Subjects

Guiana Shield , Guyana , Kamakusa Mtn , leaf anatomy , Raveniopsis , Rutaceae , Trichomes

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.91.14763

 

Abstract

Raveniopsis microphyllus K.Wurdack, sp. nov., a new species known only from a single peak in the Pakaraima Mtns. of Guyana, is described and illustrated. This white-flowered shrub adds to the many narrow-endemic Guiana Shield species in the genus, and is unique in bearing small, trifoliate, sclerophyllous leaves. Leaf anatomy and surface micromorphology of the new species were examined to document its montane adaptations. The multiple trichome types of the leaves and flowers of new species were characterized, and the systematics value of the considerable foliar trichome variation in Raveniopsis is discussed.