. Brigham Young University science bulletin. Biology -- Periodicals. nubigena virgata setosissima I ij:. 1. A proposed pin logcnctic urrangcnicnt ol the groups wiltiin the siibiicnus Orcocurv u. The jamesii group: This group is compt)sed o( live species and seven varieties mostly confined to the eastern and southeastern section of the range of the subgenus (Fig. 2). It is characterized by the hemi- spherical fruit, with the nutlets smooth on all sur- faces, or rugose and tuberculate, but not at all muricate on the dorsal surface. Ventral surface of ihe nutlet quite or nearly smooth, with the s
. Brigham Young University science bulletin. Biology -- Periodicals. nubigena virgata setosissima I ij:. 1. A proposed pin logcnctic urrangcnicnt ol the groups wiltiin the siibiicnus Orcocurv u. The jamesii group: This group is compt)sed o( live species and seven varieties mostly confined to the eastern and southeastern section of the range of the subgenus (Fig. 2). It is characterized by the hemi- spherical fruit, with the nutlets smooth on all sur- faces, or rugose and tuberculate, but not at all muricate on the dorsal surface. Ventral surface of ihe nutlet quite or nearly smooth, with the scar narrow, straight, and closed, and without an elevated margin. The species within the jamesii group form a natural unit. Cryptuiulhi jamesii has more primitive char- acters (smooth hemispherical nutlets, short corolla tube with crests at the base, low fornices. oblance- ohite leaves, strigose pubescence, and elongate cymes) than any other species in the subgenus and is prob- ably similar to the hypothetical, ancestral form. C. palmcri. although very closely related to C. jamesii, shows the advanced characteristics of crests lacking at the base of the tube, accrescent sepals, and longer style. C. crassipes is to be considered more advanced than C. palmcri on the basis of the capitate in- tlorescence. rougliened nutlets, and the longer style, which are all considered as specialized characters. It seems probable that long corolla tubes are derived from shorter i)nes and that heterostyled tlowers are derived from uniform llowers. On this basis C oblata is more specialized than C. jamesii. C. paysonii prob- ably very recently has evolved from C. oblata. but it is more specialized because of the strongly hetero- styled flowers and the more capitate inllorescence. paysonii crassi palmer. oblata lig. 2. A proposed phylogenetie arrangement of Ihe spcejes wuliin the janicsii group. The flava group; The flava group is composed of seven species, most of which are confined to Utah and no
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