Arceuthobium (Viscaceae) in Mexico and Guatemala: Additions and range extensions

Three new dwarf mistletoes are described:Arceuthobium globosum subsp.grandicaule (Mexico and Guatemala),A. aureum subsp.aureum (Guatemala) andA. aureum subsp.petersonii (Chiapas, Mexico).Arceuthobium guatemalense is recorded for the first time in Mexico. Significant range extensions are recorded forA. abietisreligiosae, A. divaricatum,A. gillii subsp.nigrum, andA. rubrum. New hosts are reported for several taxa. Nineteen members of the genus are presently known from Mexico, and three (possibly four) from Guatemala. Chromosome counts are reported for the first time for 3 taxa.     

New combinations in Hawaiian Chamaesyce (Euphorbiaceae)

Chamaesyce is accepted at the genus level for the Hawaiian taxa. The following new combinations are made:C. celastroides var.laehiensis, C. celastroides var.tomentella, C. rockii var.grandifolia, C. skottsbergii var.vaccinioides, andC. sparsiflora.     

A conspectus of Mexican and Central American Picramnia (Simaroubaceae)

A complete checklist with synonymy and notes is provided for the Mexican and Central American species ofPicramnia. A key to all taxa of the region is included. Four new taxa (Picramnia guerrerensis, P. hirsuta, P. deflexa, andP. antidesma subsp.nicaraguensis) are described and illustrated, and a new combination (Picramnia antidesma subsp.fessonia) is made.     

New taxa and combinations in Agastache (Lamiaceae)

Diagnoses are given for the following new taxa:Agastache eplingiana, A. micrantha var.durangensis, A. pallida var.coriacea,A. pallidiflora var.gilensis andA. palmeri var.leonensis. Five new combinations are made.     

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 of Malpighia (Malpighiaceae) from Mexico and the West Indies

Malpighia romeroana var.nayaritensis is described from Nayarit, México, andM. albiflora subsp.antillana andM. nummulariifolia subsp.oblongifolia from the West Indies.     

A new subspecies and new combinations in Comarostaphylis (Ericaceae)

Comarostaphylis spinulosa subsp.glandulifera is described from the mountains of Oaxaca and Puebla, Mexico. Four new combinations inComarostaphylis are also made:C. arbutoides subsp.costaricensis, C. discolor subsp.rupestris, C. polifolia subsp.minor, andC. spinulosa.Arctostaphylos glabrata, A. rupestris, andA. spinulosa are lectotypified and the status ofC. polifolia is discussed.     

A revision of Vernonia series Buddleiifoliae (Compositae: Vernonieae)

SeriesBuddleiifoliae of the genusVernonia of southeastern South America consists of 18 species which are keyed, described, discussed and mapped.Vernonia goiasensis is proposed as a new name, whileV. wasshausenii andV. monocephala subsp.irwinii are described as new taxa, and V.asteriflora subsp.kuntzei is presented as a new combination.     

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 taxa and combinations in neotropical Juncus (Juncaceae)

Juncus arequipensis andJ. breviculmis are described as new species, andJ. ramboi subsp.colombianus as a new subspecies.Juncus arcticus Willd. var.mexicanus (Willd.), var.montanus (Engelm.), and var.andicola (Hook.) are proposed as new combinations.     

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.     

Dragma hippomanicum X: Astragali (Leguminosae) nevadenses novi criticive,singulo peruviano adjecto

One new species,Astragalus tiehmii, and two new varieties,A. convallarius var.margaretae andA. oophorus var.lavinii, are described from Nevada; the relationships of each are discussed and the first is illustrated. Two new combinations,A. eurylobus (Barneby) Barneby andA. serenoi var.shockleyi (M. E. Jones) Barneby are proposed and defended. A new species,A. bryogenes, is described from high Andean Peru (Junín).     

New taxa and nomenclatural changes in arceuthobium (viscaceae)

The following new taxa are recognized inArceuthobium: subgeneraArceuthobium andVaginata; sectionsVaginata, Campylopoda, andMinuta; seriesCampylopoda,Rubra, andStricta; speciesA. apachecum,A. californicum,A. guatemalense,A. hondurense, andA. pini; new formae spécialesA. abietinum f. sp.concoloris,A. abietinum f. sp.magnificae. New combinations:A. abietinum (Engelm.) Hawksworth & Wiens, andA. microcarpum (Engelm.) Hawksworth & Wiens.     

Dragma Hippomanicum III: Novitates Californicae

Two new taxa are described from California:Astragalus (sect.Flexuosi)shevockii from the Sierra Nevada in Tulare County representing a new subsect.Shevockiani; andA. lentiginosus var.piscinensis from an alkaline spring in Mono County. Rediscovery in Nevada of long-lostA. lentiginosus var.sesquimetralis and a new station for the same in Inyo County, California are reported.     

New names,combinations, and lectotypifications in Heterotheca (Compositae: Astereae)

The following new names and combinations are proposed:Heterotheca barbata (Rydb.) Semple,H. horrida subsp.cinerascens (S. F. Blake) Semple,H. fulcrata vararizonica Semple,H. fulcrata var.senilis (Wooton & Standley) Semple,H. oregona var.compacta (Keck) Semple,H. oregona var.rudis (Greene) Semple,H. oregona var.scaberrima (A. Gray) Semple,H. pumila (Greene) Semple,H. villosa var.pedunculata (Greene) V. Harms ex Semple, andH. zionensis Semple. The following chromosome numbers are reported for the first time:H. fulcrata var.arizonica, 2n=9 _II ;H. horrida subsp.cinerascens, 2n=18 _II ;H. pumila, 2n=9 _II ,2n=18 _II ;H. zionensis, 2n=9 _II .