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Auteur Guy L. Nesom |
Documents disponibles écrits par cet auteur (3)
Affiner la rechercheGamochaeta impatiens, sp. nov. (Asteraceae: Gnaphalieae), the USA adventive previously identified as G. coarctata / Guy L. Nesom in Phytoneuron, 35 (2022)
Titre : Gamochaeta impatiens, sp. nov. (Asteraceae: Gnaphalieae), the USA adventive previously identified as G. coarctata Type de document : Imprimé Auteurs : Guy L. Nesom Année de publication : 2022 Article en page(s) : 1-48 Langues : Français (fre) Mots-clés : Gamochaeta impatiens Résumé : A morphometric analysis (Freire et al. 2021) found no consistent difference between South American plants identified as Gamochaeta americana (Mill. 1768) Wedd. and Gamochaeta coarctata (Willd. 1803) Kerg. Their observation is confirmed here through examination of general collections as well as the types (from Jamaica and Uruguay, respectively). The widespread and common species in the southeastern USA, however, which mostly has been identified as G. coarctata, is not the same as the South American species. Instead it appears to be an adventive from South America without formal taxonomic recognition –– it is described here as Gamochaeta impatiens Nesom, sp. nov. Of the two, only G. impatiens occurs in the USA but G. americana and G. impatiens both are adventive in various parts of the world. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152018
in Phytoneuron > 35 (2022) . - 1-48Nesom, Guy L. 2022 Gamochaeta impatiens, sp. nov. (Asteraceae: Gnaphalieae), the USA adventive previously identified as G. coarctata. Phytoneuron, 35: 1-48.Documents numériques
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Titre : New distribution records for Gamochaeta (Asteraceae : Gnaphalieae) in the United states Type de document : Imprimé Auteurs : Guy L. Nesom Année de publication : 2004 Article en page(s) : 1175-1185 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Gamochaeta Résumé : Gamochaeta stagnalis is reported for the first time for the United States (Arizona and New Mexico). In Arizona these plants have previously been identified as Gamochaeta purpurea and Gamochaeta falcata. The species is common in Mexico and apparently is at the northern limit of its distribution in Cochise, Pima, and Santa Cruz cos., Arizona, and Hidalgo Co., New Mexico. Gamochaeta purpurea sensu stricto also occurs in Arizona, disjunct from its main range in the eastern U.S.A. Plants of the southeastern U.S.A. previously identified in some treatments as Gamochaeta falcata are separated into two species: Gamochaeta calviceps and Gamochaeta antillana. A lectotype is chosen for G.antillana. Gamochaeta calviceps is known primarily from the southeastern U.S.A. but is reported from two collections in California. Gamochaeta coarctata is first reported for Arkansas and Virginia and further documented for California. Gamochaeta stachydifolia, a South American native, is reported from two counties in California. For each of the 12 Gamochaeta species recorded for the U.S.A., a hypothesis of nativity is given, with a brief rationale. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=154520
in SIDA > 21 (2) (2004) . - 1175-1185Nesom, Guy L. 2004 New distribution records for Gamochaeta (Asteraceae : Gnaphalieae) in the United states. SIDA, 21(2): 1175-1185.
Titre : Taxonomic notes on Verbena bonariensis (Verbenaceae) and relates species in the USA Type de document : Imprimé Auteurs : Guy L. Nesom Année de publication : 2010 Article en page(s) : 1-16 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Taxonomie
[CBNPMP-Géographique] AmériqueMots-clés : Verbena bonariensis Verbena incompta Verbena brasiliensis Verbena litoralis Verbena montevidensis Résumé : Verbena bonariensis, as previously recognized in the USA, is here recognized to include two distinct species, both native to South America and both widespread in geographic range. Verbena incompta is the more common of the two and is characterized by relatively smaller flowers and eglandular vestiture; V. bonariensis sensu stricto has larger, showy flowers and glandular stems, peduncles, and calyces. Verbena litoralis has sometimes been recognized to occur in the USA, but such records have proved to be V. brasiliensis and V. montevidensis. Verbena litoralis sensu stricto is native to northwestern South America, Central America, and Mexico, apparently not reaching the USA even as an adventive. Verbena montevidensis is documented to be naturalized in Alabama, Arkansas, Florida, Georgia, Louisiana, Oregon, and Texas. Each of these species is distinctive in North America. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148665
in Phytoneuron > 12 (2010) . - 1-16Nesom, Guy L. 2010 Taxonomic notes on Verbena bonariensis (Verbenaceae) and relates species in the USA. Phytoneuron, 12: 1-16.Documents numériques
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