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Names and Types in Perennial Atriplex Linnaeus (Chenopodiaceae) in North America Selectively Exclusive of Mexico

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Names and Types in Perennial Atriplex Linnaeus (Chenopodiaceae) in North America Selectively Exclusive of Mexico Great Basin Naturalist Volume 55 Number 4 Article 4 10-31-1995 Names and types in perennial Atriplex Linnaeus (Chenopodiaceae) in North America selectively exclusive of Mexico Stanley L. Welsh Brigham Young University Clifford Crompton Biosystematics Research Centre, Ottawa, Ontario, Canada Follow this and additional works at: https://scholarsarchive.byu.edu/gbn Recommended Citation Welsh, Stanley L. and Crompton, Clifford (1995) "Names and types in perennial Atriplex Linnaeus (Chenopodiaceae) in North America selectively exclusive of Mexico," Great Basin Naturalist: Vol. 55 : No. 4 , Article 4. Available at: https://scholarsarchive.byu.edu/gbn/vol55/iss4/4 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Great Basin Naturalist 55(4), © 1995, pp. 322-334 NAMES AND TYPES IN PERENNIALATRIPLEX LINNAEUS (CHENOPODIACEAE) IN NORTH AMERICA SELECTIVELY EXCLUSIVE OF MEXICO Stanley L. Welsh1 and Clifford Crompton2 ABSTHAGc-Cited are names and combinations within the woody species ofAtriplex as they occur in North America. Types and their repositories are included for all taxa except those for \vhich that information could not be located. I\ew nomenclatural proposals include Atriplex gardneri val'. aptera (A. Nelson) 'Velsh & Crompton, comb. nov.; A. garrettii vax. navajoensis (C. A. Hanson) 'Welsh & Crompton, comb. naY.; Attiplex acanthocarpa val'. coahuilensis (Henrickson) Welsh & Crompton, comb. noy. A lectotype is designated for A. breweri S. \Vatson. Key words: Chenopodiaceae, Atriplex types, North America. This list of names and synonyms of peren­ Niobrara Shale, Mancos Shale, Morrison nial and woody Amplex taxa is preliminary to Formation, and numerous other geological for­ the preparation of a taxonomic treatment for mations support these plants. Saline pans and the woody species of Atriplex as they occur in other poorly drained lowlands are occupied by North America, both indigenous and intro­ these species. Despite the affinity for saline duced species. All names, whether treated as areas, where they have little competition taxa recognized by me or as mere synonyms, (except from other halophytes), some of the are included. The taxonomic treatment that species thrive where total soluble salts are low. will appear subsequently in the publication of The four-wing saltbush, Atriplex canescens the Flora North America Project will distin­ (Pursh) Nuttall, is such a plant. It grows from guish between the names of taxa per se and the edge of saline areas up gradient into far their included synonyms. The relatively large less saline substrates, often in grasslands or in number of names and synonyms for this small shrublands dominated by sagebrush and other group of plants is indicative of the changes in shrubby species. generic concepts, the ever-changing interpre­ Hybridization is an important factor con­ tation of the status of a taxon, and the general tributing to the diversity of woody Amplex phenotypic plasticity of this amazing group of species. There are at least two main taxa shrubs, subshrubs, and perennial herbs, which around which many of the remainder are hybridize freely among themselves and some­ placed, and with which most form at least times with other taxa not apparently closely occasional hybrids, i.e., A. eaneseens (Pursh) allied. They grow on a surprising array of sub­ Nuttall and A. eonfertifolia (Torrey & Fremont) strates in the American West, from the cold S. Watson. Some of the hybrids have received temperate of northern Alberta to the much names and formal taxonomic recognition. warmer climates of Mexico. Often they are Most ofthem are ofoccasional occurrence, and among the most important shrub species on some of the taxa treated in contemporaneous saline, fine-textured substrates, and some­ taxonomic works are apparently of hybrid times they are the only shrubby iohabitants. derivation-now more or less stabilized as pop­ Their ability to survive and even thrive in ulations, mainly on very peculiar substrates. saline sites has placed them in a pnsition of The following list is thought to be exhaus­ importance for browsing animals where other tive for woody and perennial Atriplex names browse is scarce or lacking. They cover huge in North America, especially for those north of areas where geomorphological processes have Mexico. A few taxa represented in Mexico are exposed raw, saline strata in vast expanses. included where they round out the names for J Li!" Sci",n,x Ml"",um 'll1d Department of)'.{)tany ,md R,lllge Science, Brigham Young University, Provo, UT 84602, 2l\iosystelllillics nesearch Centre, ''I'm. s,lulldcr.1 Buddin!:. C. E. F. Ottawa, Ontario KIA PC6, Canad". 322 1995] NORTH AMEnTCAN PERENNIAL ATRIPLEX TYPES 323 species complexes largely confined north of Basionym: A. pnnglei Standley that country. Pertinent types have been received The taxon is endemic to Mexico, from northern Zacatecas and southern Nuevo Leon south to San Luis on loan by the gracious kindness ofcurators of Potosi. the herbaria cited with the specimens. Abbre­ viations for the herbaria are those standard Atripwx acanthocarpa ssp. .~tewartii (I. M, Johnston) ones cited in Index HerbarioI'l1m, except that Henrickson, Southwest. Nat. 3:3: 457.1988. Basionym: A. stewartii 1. M. Johnston the origin of the collection is indicated by use TIw taxon is endemic to Coahuila, Mexico, and is dis­ of such designations as NY Torrey for historic tinguished by its 4-wingcd fruiting hradeoles, although specimens. This is thought to be important specimens arc transitional to A. acanthocarpa var. aean­ because it authenticates the antiquity of the tlwearpa. specimen and might prove important in cer­ Atriplex amnicola P. G. WIlson, Flora of Australia 4: 322. tain cases in judging whether a particular 1984. author had access to a given specimen. Type; "Yalgoo, W. A." [western Australia], 10 Oct. 1945, The type information is presented below in C. A. Gardner 7751a; holotype PERTH! dual format for some taxa, with the type locali­ Atriplex angustior Cockerell, Proc. Davenport Aead. Nat. ty or collector information 0wrcin arbitrarily Sci. 9: 7. 1902. designated "Type locality") as recorded with = A. canescens (Pursb) Nuttall the protologue cited first and with the label Type: New Mexico, Dona Ana Co., Mesilla Park, data of the type specimen (herein designated Cockerell in 1900; holotype US! "lype") cited second where there is a substan­ The US spedmen bcars the following label data: "Atriplex angustiOl; n. sp. Distinguished from A. eanescens tial difference in the two accounts. by the very narrow (3 mm broad) leaves. Apparently = A. caneseens ,mgnstifolia hut that name is preoccupied. Sand Atriplex acantlwcarpa ('lorrey) S. Watson, Proc. Amer. Hills Mesilla Park, N. M. 1900. 'IDA CockerelL" Aead. Arts 9: 117. 1874. Hall and Clements (1923) cited this as a new name for Basionym: Obione acantJwCAlrpa 1brrcy A. canescem vm: angustifolia, but it seem~ obvious that This is a shrub or subshrub, generally less than 1 m while Cockerell recognized the equivalency of the taxa, tall, characterized by spongy fruiting bracteoles 8-1.5 mm he was proposing a new taxon, not merely a new name. long, borne on slender to stout pedicel:; 4-20 mm long. Leaves are variahle, hut often sinuate-dentate to undu­ AtrilJlex aptera A. Nelson, Bot. Gaz. a4: 356. 1902. late-crisped and with hastately lobed base. Thc species = A. gardneri val'. nptern (A. Nelson) Welsh & occurs from west 'lexas and southern New Mexico south Crompton to Mexico. It is represented in the United States by two Type 10l:ality: Wyoming, Laramie, Sept. 1901, E. varieties, Le., val'. acantlwcarpa from western Texas west Nelson 738; A. Nelson (1902). through southern New Mexico to southeastern Arizona, Type: "Atriplex apwnJ A. Nels. n. sp. Moist saline soil. and var. coahuilensis in southern Texas. Laramie, Albany Co., Wyoming. Sept. 19tH. Elias Nelson No. 738"; holotype RM!; isotype CHI, UC (frag.)! Atriplex acanthocarpa ssp. coahuilensi.~ Henrickson, Hanson (1962) suggested that his taxon was of hybrid Southw. Naturalist 33: 4.58. 1988. derivation involving A. eanescens and A. blix~f()lia as = A. acanthocurpa var. coahuilensis (Henrickson) parental taxa. Disb"ibutiun of specimens assignable to the Welsh & Crompton (cited below). concept is sporadic, possibly indicating multiple origins, Type: Mexico, Coahuila, ca 2 Ion W of Nadadorcs in and it cannot be considered a taxon in the usual sense. saline pastured flats nem' El Porvinir along Hwy. 30, with The type specimen ofA. aptem has definite wings aligned Suaeda, Sporobolus, Distiehlis, nar 27°03' N lat, in fonr rows similar to some A. cnnescens hut agrees in 101 °37'W long, ,540 m, 6 Dec 1975, J. Henrickson 14784; aspect, size, and general features with A. garrlneri. holotype TEX; isotypes MEXU, NY!, RSA. This taxon is distinguished by its fruiting bradeoles Atriplex berlandieri Moquin-Tandon, Chenop. Enum. 65. bearing radiating processes, and stems witb at least the 1840. medial leaf blades hastate-laneeolate, and with mature = A. canesccm; (Pursh) Nuttall fi'uiting inflorescences very long. Its range is from south­ Type: "In regno Me-x.icano. Berlmldicr 1828"; holotype? ern Texas to southeast Coabuila and coastallamalllipas. Moquin-Tandon enlarges on the type information in his treatment in Prodromus (13[2]: 114. 1849), "In regno Atripwx acanthocartJa val". coahuilensis (Henrickson) Mexicano inter Lavcrdo et Bejar (Berland.! n. 1450)." Welsh & Crompton, comb. nov. Basionym: A. acanthocarpa ssp. coahuil.ensis Henrick­ AtriplRx bonrwviUensis C. A. Han~on, Stud. Syst. Bot. son, Southwest. Nat. 33: 458. 1988. Brigham Young Univ. 1: 2. 1962. = A. gnrdnm"i var. honnevillensis (c. A. Hanson) wc1~h Atriplex acanthocarpa val". cuueata (A. Nelson) M, E. Type: Utah, Millard Co., "dlY lake bed 1.5 miles north­ Jones, ContI'. West. Bot. 11: 20. 1903. east of headquarters, Desert Range Experiment Station = A.
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