Illustrator: John Myers Copyright: Flora of North America Association Trees to 80m; trunk to 5m diam.; crown narrowly conic. Bark grayish brown to orangebrown. Branches
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in the evolution of floral morphology (R. M. Straw 1955, 1956, 1956b; J. Walker-Larsen and L. D. Harder 2001; M. C. Castellanos et al. 2004, 2006), pollination
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D. Don) Lindley 1833, Treatment appears in FNA Volume 2. Trees to 80m; trunk to 2.2m diam.; crown spirelike. Bark grayish brown, in age becoming thick
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Britton et al. in N. L. Britton et al., N. Amer. Fl. 34: 63. 1914. Theodore M. Barkley†, Luc Brouillet, John L. Strother Synonyms: Undefined (tribe Undefined)
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T. M. 1978. Senecio. In: N. L. Britton et al., eds. 1905+. North American Flora.... 47+ vols. New York. Ser. 2, part 10, pp. 50–139. Barkley, T. M., B
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wootonii Linnaeus Sp. Pl. 2: 866. 1753. , Gen. Pl. ed. 5, 373. 1754. Theodore M. Barkley† Common names: Groundsel ragwort butterweed Etymology: reputedly from
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Majesty's Stationery Office, London, England. 389 pp. Columbus, J.T., M.S. Kinney, R. Pant and M.E. Siqueiros Delgado. 1998. Cladistic parsimonv analysis of internal
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petaloid appendages, enclosing solitary pistillate flower surrounded by (0–) 1–80 staminate flowers, entire structure termed the cyathium), in monochasia, dichasia
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Oxytenia, Parthenice, Parthenium, Xanthium Lessing Linnaea 5: 151. 1830. Theodore M. Barkley†, Luc Brouillet, John L. Strother Synonyms: Undefined (tribe Undefined)
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730–735. Barkley, T. M. 1962. A revision of Senecio aureus L. and allied species. Trans. Kansas Acad. Sci. 65: 318–408. Barkley, T. M. 1968. Taxonomy of
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not spread to the surrounding area (P. M. Brown 2002). Bletia patula Hooker is an apparent garden escape (P. M. Brown 2000). A single vegetative specimen
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bracteate; bracts distinct or connate, sometimes forming an involucre containing 1–80 flowers, when containing only 1 flower, calyxlike, sometimes brightly colored
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abruptly or gradually tapered or acuminate, occasionally piliferous; costa to 40–80% leaf length, moderate to somewhat stout, terminal spine present or absent;
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centuries were S. F. Blake, N. L. Britton, R. S. Ferris, M. L. Fernald, E. L. Greene, H. M. Hall, M. E. Jones, D. D. Keck, P. A. Rydberg, J. K. Small, and
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reddish pappi in some species Synonyms: Haplopappus sect. Pyrrocoma (Hooker) H. M. Hall Treatment appears in FNA Volume 20. Treatment on page 413. Mentioned
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substrate or not. Roots diffuse or taproots (adventitious from offsets in M. thornberi and M. prolifera). Stems unsegmented, green to gray-green, sometimes purplish
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Flaveria, Haploësthes, Sartwellia Lessing Syn. Gen. Compos., 235. 1832. Theodore M. Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume
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Shrubs 1.5–4 m, stems erect; inflorescences usually paniclelike, sometimes racemelike, (3–)5–15 cm. Ceanothus leucodermis 4 Shrubs 0.5–1.5 m, stems erect
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Xylorhiza Cassini J. Phys. Chim. Hist. Nat. Arts 88: 195. 1819. Theodore M. Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume
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P.M. and C.R. Annable. 1991. Systematics of the annual species of Muhlenbergia (Poaceae-Eragrostideae). Syst. Bot. Monogr. 31:1-109 Peterson, P.M. 2000
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