Date of Award:

5-1968

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Botany

Committee Chair(s)

Arthur H. Holmgren

Committee

Arthur H. Holmgren

Committee

R. J. Shaw

Committee

I. G. Palmblad

Committee

R. T. Sanders

Abstract

Nine populations of sixty-eight individuals representing the distribution of Petrophytum caespitosum (Nutt.) Rydb. (Rosaceae) in the Intermountain Region were investigated for taxonomically significant variation using numerical techniques. On the basis of 19 morphological characters 3 subspecific taxa are recognized. Two taxa are existing subspecies: P. caespitosum (Nutt.) Rydb. var. caespitosum and P. caespitosum (Nutt.) Rydb. var. elatius (S. Wats.) Tides. One new subspecies is described: P. caespitosum (Nutt.) Rydb. var. latifolium. The ecology of the species is discussed. The floral and vegetative anatomy are described. Chromosome counts of 3 populations have given n = 9. A list of herbarium material is given. The numerical analyses were run on an IBM S/360 computer using standardized data to find the coefficients of correlation between individuals of the same population and the coefficients of correlation between pairs of populations. The results of the numerical analyses agree with more traditional methods.

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1a6bc090c7417dd1aa38b631475ac552

Comments

This work made publicly available electronically on July 19, 2010.

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