Revision of Houstonia (Rubiaceae-Hedyotideae)

The genus Houstonia (Rubiaceae-Hedyotideae) comprises 20 annual and perennial herbaceous species native to the U.S.A., Canada, and Mexico. This revision utilizes seed morphology as shown by scanning electron microscopy, chromosome number, and pollen structure as the most taxonomically significant ch...

Full description

Saved in:
Bibliographic Details
Published in:Systematic botany monographs 1996-06, Vol.48, p.1-118
Main Author: Terrell, Edward E.
Format: Article
Language:English
Subjects:
Anthers
Biological taxonomies
Calyx
Capsules
Corolla
Flowers
Inflorescences
Plants
Ploidies
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The genus Houstonia (Rubiaceae-Hedyotideae) comprises 20 annual and perennial herbaceous species native to the U.S.A., Canada, and Mexico. This revision utilizes seed morphology as shown by scanning electron microscopy, chromosome number, and pollen structure as the most taxonomically significant characters. Other important morphological data have come from inflorescence types and flower and fruit morphology. The genus is subdivided into two subgenera, Houstonia and Chamisme. Subgenus Houstonia comprises two sections: sect. Houstonia includes the type of the genus, H. caerulea, and four annual and perennial species of the eastern and central U.S.A. and eastern Canada; sect. Mullera includes H. rosea, an annual species of the southcentral and southeastern U.S.A. Subgenus Chamisme also comprises two sections: sect. Amphiotis includes the type, H. purpurea, and three other perennial species of the eastern and central U.S.A. and Canada; section Ericotis includes the type, H. rubra, and nine other annual and perennial species of the southwestern U.S.A. and Mexico. The systematic treatment provides synonymies, descriptions, keys, phenological and geographic data, illustrations, and distribution maps.
ISSN:0737-8211
DOI:10.2307/25027862