sometimes woody at bases. Boulos, L. 1973. Révision systématique du genre Sonchus L. s.l.: IV. Sous-genre: 1. Sonchus. Bot. Not. 126: 155–196. Sonchus arvensis
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character (D. J. Rogers 1951). Rogers, D. J. 1951. A revision of Stillingia in the New World. Ann. Missouri Bot. Gard. 38: 207–259. Stillingia aquatica, Stillingia
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Greek sykomoros, mulberry. Benson, L. D. 1943. Revisions of status of southwestern trees and shrubs. Amer. J. Bot. 30: 230-240. Santamour, F. S. Jr. 1972b.
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present in extrafloral species. He, S. 1997. A revision of Homalia (Musci: Neckeraceae). J. Hattori Bot. Lab. 81: 1–52. Homalia trichomanoides window.
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Carpobrotus naturalize vegetatively and from seed. Blake, S. T. 1969. A revision of Carpobrotus and Sarcozona in Australia, genera allied to Mesembryanthemum
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Western Hemisphere. Species ca. 650 (2 in the flora). Atwood, J. T. 1993. A revision of the Maxillaria neglecta complex (Orchidaceae) in Mesoamerica. Lindleyana
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flora). Cook, C. D. K. and K. Urmi-König. 1985. A revision of the genus Elodea (Hydrocharitaceae). Aquatic Bot. 21: 111--156. St. John, H. 1920. The genus Elodea
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flora). Cook, C. D. K., and R. Lüönd. 1983. A revision of the genus Blyxa (Hydrocharitaceae). Aquatic Bot. 15: 1--52. Thieret, J. W., R. R. Haynes, and
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region. Peterson, P.M. and C.R. Annable. 1990. A revision of Blepharoneuron (Poaceae: Eragrostideae). Syst. Bot. 15:515-525. Blepharoneuron tricholepis window
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T. Williams. 1975. A revision of Beta section Vulgares (Chenopodiaceae), with new light on the origin of cultivated herbs. Bot. J. Linn. Soc. 71: 89–102
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Salsola (Chenopodiaceae) in North America. Ann. Missouri Bot. Gard. 83: 387–395. Rilke, S. 1999. Revision der Sektion Salsola s.l. der Gattung Salsola (Chenopodiaceae)
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America. Burley, J. S. and N. M. Pritchard. 1990. Revision of the genus Ceratodon (Bryophyta). Harvard Pap. Bot. 2: 17–76. Snider, J. A. 1994. Ceratodon. In:
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species names within Malus. The genus requires a comprehensive worldwide revision. The eastern North American apples stand apart from other members of the
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Mexico. Mem. New York Bot. Gard. 69: 156. Salmon, E. S. 1898. A revision of the genus Symblepharis, Montagne. J. Linn. Soc., Bot. 33: 486–501. Symblepharis
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examining cells near mid leaf. Koponen, T. J. 1968. Generic revision of Mniaceae Mitt. (Bryophyta). Ann. Bot. Fenn. 5: 117–151. Koponen, T. J. 1974. A guide to
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obscured by dense vestiture) and have a distinctive resinous odor. Previous revisions (for example, P. A. Rydberg 1908c; D. D. Keck 1938) have placed Horkelia
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previously treated within Aster. Cronquist, A. 1948. A revision of the Oreastrum group of Aster. Leafl. W. Bot. 5: 73–82. Nesom, G. L. 1993d. The genus Oreostemma
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species. Magombo, Z. L. K. 2003. Taxonomic revision of the moss family Diphysciaceae M. Fleisch. (Musci). J. Hattori Bot. Lab. 94: 1–86. Diphyscium window.pr
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and in the tropics at high elevations. Ireland, R. R. 1969b. A Taxonomic Revision of the Genus Plagiothecium for North America, North of Mexico. Ottawa.
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Contributions to American bryology. IX. A revision of the genus Scouleria with description of one new species. Bull. Torrey Bot. Club 22: 36–43. Churchill, S. P
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