A Distributional and Taxonomic Study of Ratibida Columnifera Var. Columnifera, Ratiba Columnifera Var. Pucherrima, and Their Hybrids in New Mexico

Author

Walter W. Marshall

Publication Date

5-30-1958

Abstract

The classification and distribution of Ratibida columnifera var. columnifera Woot. and Standl. and R. columnifera var. pulcherrima (DC.) Woot. and Standl. are complex. Some floras list R. columnifera var. pulcherrima as a purple colored form or variety of the species while other authors refer to this taxon as a separate species of Ratibida. The purpose of this study is to clarify the taxonomic status of the two forms by determining and differences in morphology, distribution, taxonomy, and ecology.

An attempt has been made to determine the route by which R. columnifera columnifera and R. columnifera pulcherrima were distributed. After this was determined, a theory was formulated which correlated the pattern of distribution with the location of pure populations of the forms.

Project Sponsors

R. columnifera, New Mexico, Taxonomy, Morphology, Ecology, Botany

Language

English

Document Type

Thesis

Degree Name

Biology

Level of Degree

Masters

Department Name

UNM Biology Department

First Committee Member (Chair)

Raymond C. Jackson

Second Committee Member

William J. Koster

Third Committee Member

Howard J. Dittmer

Recommended Citation

Marshall, Walter W.. "A Distributional and Taxonomic Study of Ratibida Columnifera Var. Columnifera, Ratiba Columnifera Var. Pucherrima, and Their Hybrids in New Mexico." (1958). https://digitalrepository.unm.edu/biol_etds/196