. Brigham Young University science bulletin. Biology -- Periodicals. BKIC'.HAM YOUNC; UNIVKRSITY SCIlNfl. liULLl 1 IN many of which are narrow endemics, confined to ;i particular kind of habitat. C. semiglahra. C. capitata. and C. johinlonii are closely related to C. confcr- tijlora, but probably because of their ability to inhabit peculiar soil types, have been selected out and isolated from that species. C. leucophaea. a species of eastern Washington, which inhabits sand dunes along the Columbia River, was for a time included within the concept of C. confcrtijlora by Parish. It is be- lieved
. Brigham Young University science bulletin. Biology -- Periodicals. BKIC'.HAM YOUNC; UNIVKRSITY SCIlNfl. liULLl 1 IN many of which are narrow endemics, confined to ;i particular kind of habitat. C. semiglahra. C. capitata. and C. johinlonii are closely related to C. confcr- tijlora, but probably because of their ability to inhabit peculiar soil types, have been selected out and isolated from that species. C. leucophaea. a species of eastern Washington, which inhabits sand dunes along the Columbia River, was for a time included within the concept of C. confcrtijlora by Parish. It is be- lieved, however, to be more advanced because of the longer intloresccnce, conspicuous foliar bracts, and narrowly lineai leaves. The aulluir, at one time, was inclined to combine C. jlava and C con fen iflora because of a few intermediates where the ranges of the two species overlap. However, with additional research the number ol' intermediates were I'ound to be so few that the two taxa are best treated as separate species. flava stricta barnebyi capitata johnstonjj leucophaea. glabra confertiflora lig. y. A proposed ;irrangemeiit of the species within the tlava group. The stricta group: The stricta group contains two species. C. srriciu and C. barnebyi. both restricted to the Uintah Basin of Utah (Fig. 4). The stricta group probably had its origin trom the tTava group. The very setose or hispid indument. stout stems, and the smooth ventral surface of the nutlets separate this group from that of llava. C. stricta is considered more advanced than C. barnebyi because of the roughened dorsal surface of the nutlet. The nubigena group: This group is composed of four species, all of higli alpine or montane areas of Cali- fornia, Oregon, and Idaho (Fig. 5). The basic charac- teristics of the group involve the lanceolate nutlets. which are smooth on the ventral surface and rinigh- ened dorsally. This group probably had its origin from the flava group through some form simila
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