Nomenclatural changes in Polygonum section Echinocaulon (Polygonaceae)

As a result of comprehensive systematic study onPolygonum sectionEchinocaulon, three new nomenclatural changes are made:P. clarkei stat. et nom. nov.,P. subsagittatum stat. nov., andP. senticosum var.sagittifolium stat. nov.     

A revision of the genus Oxytheca Nutt. (Polygonaceae)

The genusOxytheca of western North America and temperate South America consists of seven species which are keyed, described, discussed, illustrated, and mapped. They are divided among sect.Oxytheca, sect.Acanthoscyphus stat. & comb. nov., and sect.Neoxytheca sect. nov.Oxytheca dendroidea subsp.chilensis is given as a new combination, whileO. parishii var.cienegensis andO. parishii var.goodmaniana are described as new. The history and relationships of the genus are discussed. It is retained as distinct fromEriogonum and is thought to have arisen from the larger genus nearE. spergulinum, E. parishii, andE. apiculatum in subgenusGanysma. Cytological data indicatedn= 20.     

Taxonomic and nomenclatural notes on west Indian hypnaceae

Taxonomic investigations on the West Indian Hypnaceae have resulted in the following new taxa,Taxiphyllum gallorum, Ectropothecium aquaticum, andIrelandia (forIsopterygium robusticaule). Vesicularia in the West Indies is treated as a single species with four varieties,V. vesicularis var.vesicularis, var.rutilans (Brid.) comb. nov., var.portoricensis (Brid.) comb. nov., and var.crassicaulis (Mitt.) comb. nov.Chryso-hypnum is segregated fromMittenothamnium; the combinationC. diminutivum (Hampe) Buck is made.     

Notes on endangered buckwheats (Eriogonum: Polygonaceae) with three newly described from the western United States

Three unnamed buckwheats listed by the United States Fish and Wildlife Service in December 1980 as potentially endangered or threatened plants are formally proposed:E. crosbyae from Lake Co., Oregon;E. grande var.dunklei from San Miguel Island, Santa Barbara Co., California; andE. ovalifolium var.williamsiae from Washoe Co., Nevada. Several other species proposed by the Fish and Wildlife Service as potentially endangered or threatened (E. allenii, E. correllii, E. eremicum, E. floridanum, E. lemmonii, E. sp./sp. nov. ined. [=E.libertini], E. tumulosum, E. umbellatum var./var. nov. ined.,E. umbellatum var.minus, E. vestitum, andE. zionis var.coccineum) are discussed and evidence is given why they cannot be considered endangered or threatened under the present Endangered Species Act of 1973, as amended.     

Three new species and a new combination in Arracacia Bancroft (Umbelliferae/Apiaceae)

Three species ofArracacia—A. hintonii, A. colombiana, andA. tillettii—from Mexico, Colombia, and Venezuela, respectively, are described as new, andCoulterophytum brevipes Coulter & Rose is transferred toArracacia asA. quadrifida, nom. nov. and comb. nov.     

Barnebya,A new genus of Malpighiaceae from Brazil

The new genusBarnebya is described and illustrated and its systematic position in the Malpighiaceae is discussed, especially its similarity in some respects to the primitive subfamily Byrsonimoideae and in other respects to the Old World genusAcridocarpus. Two species are recognized,B. dispar comb. nov. andB. harleyi sp. nov.; these are described and illustrated and a key is provided for their distinction.     

A new name and new combinations in Campomanesia and Pimenta (Myrtaceae)

One new name is proposed and eleven new combinations are made inCampomanesia andPimenta. Lectotypes are selected forC. eugenioides var.desertorum, C. phaea, andP. racemosa var.hispaniolensis, var.ouza, and var.terebinthina.     

New taxa in Pectis (Compositae: Pectidinae) from Mexico and the southwestern United States

Pectis minutiflora,P. papposa var.grandis, andP. purpurea var.sonorae are described as new. A new combination,P. purpurea var.lancifolia also is included. Chromosome counts (n = 12) are reported forP. papposa var.grandis andP. purpurea var.sonorae.     

New species and combinations in Odontonema (Acanthaceae)

Six new species ofOdontonema are described:Odontonema album, O. amicorum, O. breedlovei, O. laxum, O. mortonii andO. speciosum. In addition two new combinations are proposed forOdontonema,O. glaberrimum andO. nitidum var.album, and nine species are transferred fromOdontonema to other acanthaceous genera, namelyAnisacanthus ramosissimus, Buceragenia foliaceo-bracteata, Pseuderanthemum cuspidatum, P. hookerianum, P. interruptum, P. paniculatum, P. stenostachyum, Stenostephanus longistaminus andStreblacanthus dubiosus.     

Morphologic variation and classification of the North American Aristida purpurea complex (Gramineae)

The morphology of the Purpureae Group of North AmericanAristida is assessed by principal components and statistical analyses. Long considered a complex of about eight species, a mosaic of intergrading phenetic forms is revealed and the complex is reduced to one species with seven varieties. The taxa that are recognized areAristida purpurea var.purpurea, var.nealleyi (comb. nov.), var.curvifolia (comb. nov.), var.parishii (comb. nov.), var.wrightii (comb. nov.), var.fendleriana, and var.longiseta. A key and synopses for the varieties are provided.     

Sphaeromeria,a genus closer to Artemisia than to Tanacetum (Asteraceae: Anthemideae)

A new species,Sphaeromeria ruthiae, from Zion National Park, and three new combinations,S. martirensis,S. compacta, andS. potentilloides var.nitrophila, are presented. Morphological and anatomical evidence is used to support the recognition ofSphaeromeria as distinct fromTanacetum.     

Two new taxa in dalea (Fabaceae: Amorpheae) from southern Mexico and Northern Chile

Dalea acracarpica, from Chiapas, Mexico is described, illustrated, and referred to sect. Parosela ser. Lasiostomae: the var. chilensis is a yellow-flowered Chilean counterpart of purple Peruvian D. pennellii var. pennellii.     

New genera and species of ericaceae (Vaccinieae) from Costa Rica and Panama

Two new monotypic genera,Didonica andUtleya, are described, withD. pendula from Panama andU. costaricensis from Costa Rica.Disterigma trimera (Panama),D. utleyorum (Costa Rica, Panama, Colombia, and Ecuador),Lateropora santafeensis (Panama),Lysiclesia panamensis (Panama),Macleania talamancensis (Costa Rica),Themistoclesia costaricensis (Costa Rica) andT. horquetensis (Panama),Vaccinium costaricense andV. orosiense (both from Costa Rica) and V.jefense (Panama) are all described as new. New combinations are provided for the PanamanianVaccinium floccosum (=Symphysia floccosa) and the West IndianVaccinium racemosum (=Symphysia racemosa). Keys are provided for the Central American species ofDisterigma andThemistoclesia, the species ofLateropora andLysiclesia, and the Costa Rican and Panamanian species ofVaccinium. Six new species are illustrated.     

New species and combinations in Thelypteris subg. Goniopteris (Thelypteridaceae)

Three new species ofThelypteris are described and illustrated:T. littoralis andT. paranaensis, endemic to the rainforest of the southern Brazilian Atlantic coast, andT. multigemmifera, endemic to inland gallery forests of the São Paulo state. In addition, four new combinations are made:T. cutiataensis (Brade) Salino,T. iguapensis (C. Chr.) Salino. A new name is proposed forDryopteris lugubris var.quadrangularis:T. montana Salino. The species treated here belong toThelypteris subg.Goniopteris due to the indument of furcate and stellate trichomes.     

New varietal combinations in Agave vivipara (Agavaceae)

New varietal combinations are made inAgave vivipara forA. deweyana, A. letonae, A. nivea, A. rubescens andA. angustifolia var.sargentii. A. angustifolia var.marginata andA. angustifolia var.variegata are transferred toA. vivipara as cultivars.     

Neotropical Segregates from Sida L. (Malvaceae)

Three genera are segregated out ofSida as natural units,viz. Sidastrum E. G. Baker, enlarged from one species to seven,Krapovickasia nom. nov. including four species, andRhynchosida gen. nov. including two species, one described as new from Bolivia,R. kearneyi. Mericarp and calyx morphology are emphasized in delimiting these genera and in defining the residual genusSida, which now assumes a more natural character.