Patricia K. Holmgren

New Mentzelias (Loasaceae) from the Intermountain Region of Western United States

Abstract Three new species and two new varieties of Mentzelia belonging to the multistemmed subshrub group of section Bartonia are described. Typical of the group, they are narrow endemics occurring in relatively barren clay soils in the Intermountain Region of interior western U.S. Mentzelia tiehmii and Mentzelia argillicola are from Nevada, Mentzelia memorabalis from northern Arizona, Mentzelia multicaulis variety uintahensis from northeastern Utah and northwestern Colorado, and Mentzelia multicaulis variety flumensevera from central Utah. Communicating Editor: Aaron Liston

A short description of the collections of The New York Botanical Garden Herbarium (NY)

An overview of the phanerogamic and cryptogamic collections accumulated by The New York Botanical Garden Herbarium (NY) since its foundation in 1891 is presented. Appended are a list of herbaria incorporated into NY, a list of collectors who have deposited their original herbaria or significant parts thereof at NY, a list of the taxonomic groups particularly well represented at NY, and a list of papers published since 1963 about the NY collections.

A TAXONOMIC STUDY OF JAMESIA (HYDRANGEACEAE)

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 taxa that can be grouped into two species. One of these,Jamesia americana, is further divided into four varieties, the second of which is new, and the fourth of which assumes a name older than that in current use:J. americana var.americana, var.zionis, var.macrocalyx, and var.rosea. The second species,J. tetrapetala, is new.

A new species of Asclepias (Asclepiadaceae)from Utah

Asclepias welshii, restricted to the Coral Pink Sand Dunes of southern Utah, is described and illustrated. Its relationship to other species of seriesRoseae is discussed.

A new species of Eremogone (Caryophyllaceae) from northern Utah and southeastern Idaho, U.S.A.

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.

Lectotypifications and a new combination in western North American Cleomaceae

Lectotypes are selected for two taxa inCleomella, and a new combination is made inCleomella (Cleomaceae). Also presented is a key to the Intermountain West species and varieties ofCleomella, a description forCleomella hillmanii and a discussion of its varieties, and a brief discussion on the distribution of the taxa ofCleomella.

A new variety of Draba oreibata (Brassicaceae) from Nevada, U.S.A.

A new variety ofDraba oreibata, var.serpentina, is described, illustrated, and discussed.

A new species of Caulanthus (Cruciferae) from Nevada

Caulanthus barnebyi from northern Nevada is described, illustrated, and compared with its nearest relative,C. glaucus S. Wats.

New combinations and lectotypifications of North American taxa in Caryophyllaceae, Chenopodiaceae, Fumariaceae, Montiaceae, Papaveraceae, and Ranunculaceae

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 var. brachycarpa (Fumariaceae), Claytonia parviflora var. utahensis (Montiaceae), Argemone parva and Eschscholzia californica var. mexicana (Papaveraceae), and Aquilegia micrantha var. loriae and Ranunculus adoneus var. caespitosus (Ranunculaceae). Second-step lectotypifications are provided for Talinum confertiflorum and Talinum pygmaeum (Montiaceae) and Platystemon termini (Papaveraceae).

Lectotypifications of ten names of North American taxa in Clusiaceae, Elatinaceae, Ericaceae, Primulaceae, and Violaceae

Lectotypes are selected for 10 names inHypericum (Clusiaceae),Elatine (Elatinaceae),Arctostaphylos andVaccinium (Ericaceae),Androsace (Primulaceae), andViola (Violaceae).