The Cespitose Lupines of Western North America

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Abstract
The section Caespitosi of the genus Lupinus, variously considered as comprising 4-12 spp., is analyzed from the standpoint of the geographical distr. of 6 diagnostic morph. characters. Exptl. culture indicates that these characters are sufficiently well fixed genetically to validate their use in the population analysis. The group occurs in 9 vegetation areas of the Pacific Northwest in sufficient numbers to allow of statistical treatment. These areas had previously been established on the basis of centers of climatic extremes. The mean, mean deviation, and range of each diagnostic character is determined for the population of each vegetation area. In general, a distinct morph. type has evolved in each area, inter-grading in one or more traits with the type in at least one contiguous area. In the systematic treatment the group is here conceived as comprising a single sp. (L. lepidus Dougl.), with the populations of the various vegetation areas being accorded subspecific rank. The accepted sub-spp. are typicus, medius, confertus, lyallii, aridus, cusickii, and caespitosus. Ssp. medius is descr. with a center of distr. in central Oregon.

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