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A revision of Penstemon sect. Saccanthera subsect. Serrulati includes a new species (P. salmonensis), a new variety (P. triphyllus var. infernalis), and the elevation of a subspecies to species (P. curtiflorus), bringing the total number of species to eight, which are keyed and described, complete with nomenclature and type citations.
A name (Eremogone loisiae) is provided for those plants from northern Utah and southeastern Idaho that have gone under the misapplied name Eremogone kingii subsp. uintahensis. Eremogone loisiae, named in honor of Lois A. Arnow, is distinguished from E. kingii by its longer and narrower, flexuous leaves and its longer sepals, petals, styles, capsules, and seeds.
During preparation of manuscript for volume 2A of Intermountain Flora, we recognized the need to publish 11 new combinations and three second-step lectotypifications. The new combinations are: Eremogone fendleri var. plateauensis, E. fendleri var. porteri, E. fendleri var. brevicaulis, and E. kingii var. compacta (Caryophyllaceae), Atriplex gardneri var. robusta (Chenopodiaceae), Corydalis caseana...
Nevada holmgrenii was originally described by Rollins as aSmelowskia, but based on phenetic similarities it appears to be more closely related to the arctic/alpine generaBraya andEutrema. It is, however, sufficiently distinct from these genera to be planced in a nonotypic genus,Nevada.
A closely related group of Great Basin endemic dradas,Draba cusickii O. E. Schulz,D. sphaeroides Payson, andD. pedicellata (Rollins & R. A. Price) Windham, are described, keyed, and discussed in order to putD. pedicellata var.wheelerensis N. H. Holmgren, var. nov. in perspective.Draba cusickii is endemic to Steens Mountain of southeastern Oregon, andD. sphaeroides is known only from three mountain...
Lectotypes are selected for names of five taxa in five genera of Brassicaceae;Boechera, Cardamine, Caulanthus, Cusickiella, Descurainia. Fourteen new combinations are made in six genera:Boechera, Descurainia, Erysimum, Parrya, Physaria, andThelypodium.
A lectotype for the nameMentzelia multiflora var.integra is selected and a new combination inMentzelia (Loasaceae) is made. A key to the varieties ofMentzelia marginata is included.
Two Nevada species are described here for the first time: Penstemon tiehmii N. H. Holmgren, which is endemic to Mount Lewis of the Shoshone Range in Lander County; and Penstemon rhizomatosus N. H. Holmgren, which is endemic to the central Schell Creek Range in White Pine County. They both belong to section Saccanthera and are closely related to P. kingii S. Watson, a Great Basin endemic of valley...
Combinations are made forKeckiella antirrhinoides var.microphylla, K. rothrockii var.jacintensis, K. ternata var.septentrionalis, Penstemon fruticiformis var.amargosae, P. grinnellii var.scrophularioides, P. heterodoxus var.cephalophorus, P. heterodoxus var.shastensis, andP. newberryi var.berryi.
Viola lithion andV. franksmithii are rock-dwelling endemics that belong to the North American perennial, caulescent, simple-leaved, blue-, purple-, or white-flowered group of species.Viola lithion, from the White Pine and Pilot mountain ranges of eastern Nevada and adjacent Utah, belongs to sectionChamaemelanium subsectionCanadenses. It most closely resembles the reniform-leaved, Olympic Mountain...
Jamesia (Hydrangeaceae) is endemic to western North America from the southern Rocky Mountains in southeastern Wyoming and Colorado west across the Great Basin to the southern Sierra Nevada and south through New Mexico and southeastern Arizona to Chihuahua and Nuevo León. Its distinctiveness and Oligocene fossil record suggest that it is an old genus. The genus comprises five geographically distinct...
The new species,Euphorbia aaron-rossii from along the Colorado River within the inner gorge of Marble Canyon and Grand Canyon, Coconino Co., Arizona, is described, mapped, and illustrated. Scanning electron micrographs of the seed coat are included. It clearly belongs to subgenusAgaloma sectionTithymalopsis, where it is most closely related toE. wrightii.
A new variety from the eastern Great Basin of western U.S.A.,Glossopetalon spinescens var.microphyllum (Crossosomataceae), is described and illustrated, and its relationship within the species is indicated by a key. The nameGlossopetalon A. Gray is used rather than the substituteForsellesia Greene, because there is little chance of confusion with the earlier nameGlossopetalum Schreber, which was illegitimately...
Two new species ofPotentilla from the Intermountain West (U.S.A.) are described and illustrated here for the first time.Potentilla cottamii is known only from the higher quartzite slopes of the Pilot Range and the Raft River Mountains of western Box Elder Co., Utah and adjacent Elko Co., Nevada in the Great Basin. It most closely resemblesP. hyparctica, P. robbinsiana, andP. frigida, which may be...
The curl-leaf mountain-mahogany of the Intermountain Region is given a varietal name for the first time,Cercocarpus ledifolius var.intermontanus. It is distinguished from var.ledifolius by its broader, less pubescent leaves, its often longer petioles, and its often longer hypanthium tube. The nameC. ledifolius var.intercedens C. Schneider is based on a likely hybrid betweenC. ledifolius var.intermontanus...
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