. Brigham Young University science bulletin. Biology -- Periodicals. f'Ig. 6. \ proposed phylogenetic arrangement of the species within the abata group. The caespitosa group: This group contains two species, both of which are apparently derived from the abata or possibly the humilis group. The distribu- tion of this group is bicentric. C. caespitosa is a very hummock fortiiing species found throughout south- ern Wyomitig growing on clay hillsides, while C. ochruleuca is a narrow endemic growing on gypsifer- ous soil in western Garfield County, Utah. The two species probably had a common ancest
. Brigham Young University science bulletin. Biology -- Periodicals. f'Ig. 6. \ proposed phylogenetic arrangement of the species within the abata group. The caespitosa group: This group contains two species, both of which are apparently derived from the abata or possibly the humilis group. The distribu- tion of this group is bicentric. C. caespitosa is a very hummock fortiiing species found throughout south- ern Wyomitig growing on clay hillsides, while C. ochruleuca is a narrow endemic growing on gypsifer- ous soil in western Garfield County, Utah. The two species probably had a common ancestor similar to C. caespitosa. ochroleuca caespitosa. The Inimilis group: The humihs group is composed of eiglit species and five varieties (Fig. 8). The basic syndrome of characters in this group includes the conspicuously muricate nutlets and a scar with a tendency to be open and therefore triangular at the base. Two basic lines of development can be seen within this group; one in which the species possess two kinds of hairs and nutlets which have short rugae between the murications; the other line has leaves which are usually silky-strigose and only murications on the nutlets. C. caiia and C. brerijlora are members of this second group. C. jonesiana and C. fulvocan- escens are considered advanced because of the long corolla tubes and more elongated nutlets. fulvocanescens propria. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brigham Young University. Provo, Utah : Brigham Young University
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