New variety of Yucca harrimaniae (Agavaceae) from Utah

Yucca harrimaniae var. sterilis Neese & Welsh is named and described from the Uinta Basin of Utah. The plant is strongly rhizomatous, evidently sterile, and has limber, sparingly filiferous leaves that tend to recline on the ground.         

New species of Astragalus (Leguminosae) from southeastern Utah

Named and described is Astragalus piscator Barneby & Welsh, a species of sect. Argophylli subsect. Missourienses. The species occurs in Grand and San Juan counties, Utah.         

New species of Primula (Primulaceae) from Utah

Named as a new species from the House Range of Millard County, Utah, as Primula domensis Kass & Welsh.     

Endangered, threatened, extinct, endemic, and rare or restricted Utah vascular plants

The status of 382 vascular plant taxa with distribution in Utah is presented. Some 66 species are possibly endangered, 198 threatened, 7 extinct, and 20 extirpated within the state; 4 species have questionable taxonomic status. Included in the list are nearly 225 species of endemic plants, many of which are among the possibly endangered, threatened, and extinct or extirpated plants. Bibliographic citations, type locality, status, and distribution by counties is included for each species or infraspecific taxon. Two new species are described: Psoralea pariensis and Eriogonum natum. One new name, Astragalus barnebyi, is proposed; and one new variety, Eriogonum umbellatum var. deserticum, is proposed. The following new combinations are made: Cycladenia humilis var. jonesii; Aralia racemosa ssp. bicrenata; Heterotheca jonesii; Hymenoxys depressa; Xanthocephalum sarothrae var. pomariense; Thelypodium integrifolium var. complanatum; Thelypodium sagittatum var. ovalifolium; Arenaria kingii var. plateauensis; Psorothamnus thompsonae; Najas caespitosus; Oenothera gouldii; Eriogonum corymbosum var. revealianum; Penstemon humilis var. obtusifolius; Penstemon lentus var. albiflorus; and Viola purpurea var. charlestonensis.       

An undescribed species of Thelypodiopsis (Brassicaceae) from the Uinta Basin, Utah

Thelypodiopsis argillacea Welsh and Atwood sp. nov. is described from specimens collected on the Green River Shale Formation in Uintah County, Utah.     

New species of Mentzelia (Loasaceae) and Phacelia (Hydrophyllaceae) from New Mexico

New species of Mentzelia and Phacelia are described from northwestern New Mexico, USA, as Mentzelia todiltoensis , N. Duane Atwood & Stanley L. Welsh, and Phacelia sivinskii N. D. Atwood, sp. nov. The new Mentzelia is compared to M. humilis based on similarities in seed, fruit, leaf, and flower morphology and to M. memorabalis in stem, leaf, and fruit morphology. Phacelia sivinskii is compared to P. constancei N. D. Atwood on the basis of seed, leaf, and flower morphology.     

Endangered and threatened plants of Utah: a reevaluation

Endangered and threatened plants of Utah are reevaluated. The lists are brought up to date, and species now known to be common are recommended to be removed from the proposed lists. Additional species are proposed to be added, including the new species, Astragalus montii Welsh.     

New taxa and combinations in the Utah flora

New taxa include: Cryptantha cinerea (Torr.) Cronq. var. arenicola Higgins & Welsh; Physaria chambersii Rollins var. sobolifera Welsh (Cruciferae); Phacelia demissa Gray var. minor N. D. Atwood (Hydrophyllaceae); Iris pariensis Welsh (Iridaceae); Astragalus preussii var. cutleri Barneby and Pediomelum aromaticum (Payson) Welsh var. tuhyi Welsh (Leguminosae); Abronia nana Wats. var. harrisii Welsh (Nyctaginaceae); Camissonia atwoodii Cronq. (Onagraceae); Habenaria zothecina Higgins & Welsh (Orchidaceae); Aqiiilegia formosa Fisch. in DC. var. fosteri Welsh (Ranunculaceae). New nomenclatural combinations include: Rhus aromatica Ait. var. simplicifolia (Greene) Cronq. (Anacardiaceae); Lomatium kingii (Wats.) Cronq., L. kingii var. alpinum (Wats.) Cronq. (Apiaceae); Cryptantha cinerea (Torr.) Cronq. var. laxa (Macbr.) Higgins; Mertensia lanceolata (Pursh) DC. var. nivalis (Wats.) Higgins (Boraginaceae); Opuntia erinacea Engelm. var. aurea (Baxter) Welsh (Cactaceae); Arenaria fendleri Gray var. aculeata (Wats.) Welsh, A. fendleri var. eastwoodiae (Rydb.) Welsh, Lychnis apetala L. var. kingii (Wats.) Welsh, Stellaria longipes Goldie var. monantha (Hulten) Welsh (Caryophyllaceae); Draba densifolia Nutt. ex T. & G. var. apiculata (C. L. Hitchc.) Welsh, D. oligosperma Hook. var. juniperina (Dorn) Welsh, Physaria acutifolia Rydb. var. stylosa (Rollins) Welsh, Thelypodiopsis sagittata (Nutt.) Schulz var. ovalifolia (Rydb.) Welsh (Cruciferae); Lotus plebeius (T. Brandg.) Barneby, Lupinus polyphyllus Lindl. in Edwards var. ammophilus (Greene) Barneby, L polyphyllus var. humicola (A. Nels.) Barneby, L. argenteus Pursh var. fulvomaculatus (Payson) Barneby, L. argenteus var. palmeri (Wats.) Barneby, Pediomelum aromaticum (Payson) Welsh, P. epipsilum (Barneby) Welsh, Psoralidium lanceolatum (Pursh) Rydb. var. stenophyllum (Rydb.) Welsh, and P. lanceolatum var. stenostachys (Rydb.) Welsh (Leguminosae); Mirabilis linearis (Pursh) Hiemerl var. decipiens (Standl.) Welsh (Nyctaginaceae); Camissonia boothii var. condensata (Munz) Cronq., C. boothii var. villosa (Wats.) Cronq., C. clavaeformis (Torr. & Frem.) Raven var. purpurascens (Wats.) Cronq., C. scapoidea (T. & G.) var. utahensis (Raven) Welsh, Oenothera caespitosa var. macroglottis (Rydb.) Cronq., Oe. caespitosa var. navajoensis (Wagner, Stockhouse, & Klein) Cronq., Oe. flava (A. Nels.) Garrett var. acutissima (W. L. Wagner) Welsh, and Oe. primiveris Gray var. bufonis (Jones) Cronq. (Onagraceae); Papaver radicatum Rottb. var. pygmaeum (Rydb.) Welsh (Papaveraceae); Dodecatheon pulchellum (Raf.) Merr. var. zionense (Eastw.) Welsh (Primulaceae); Aquilegia flavescens Wats. var. rubicunda (Tidestr.) Welsh, Delphinium andersonii Gray var. scaposum (Greene) Welsh, D. occidentalis (Wats.) Wats. var. barbeyi (Huth) Welsh, and Ranunculus andersonii Gray var. juniperinus (Jones) Welsh (Ranunculaceae); Purshia mexicana (D. Don) Welsh and P. mexicana var. stansburyi (Torr.) Welsh (Rosaceae); Galium mexicanum H.B.K. var. asperrimum (Gray) Higgins & Welsh (Rubiaceae); Castilleja parvula Rydb. var. revealii (N. Holmgren) N. D. Atwood and C. rhexifolia Rydb. var. sulphurea (Rydb.) N. D. Atwood (Scrophulariaceae).