leaf blades often toothed > 21 21 Leaves with 3 prominent veins, sparsely farinose; seeds 0.7-0.8 mm diam Chenopodium nevadense 21 Leaves with one prominent
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nw Mexico, South America (Argentina), South America (Chile) Species ca. 22 (21 in the flora). Both homoploid hybridization and allopolyploidy have played
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South America to North America, mostly in temperate regions Species ca. 100 (21 in the flora). Fifteen of the species treated here occur also in Mexico; those
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Nev., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wyo., nw Mexico Varieties 21 (21 in the flora). Ericameria nauseosa is widespread, often abundant, and complex
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Galeas beakless. > 20 20 Galea margins entire medially, 1-toothed distally. > 21 21 Calyces glabrous. > 22 22 Bracts 2-pinnatifid to midrib. Pedicularis sylvatica
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deflexa 20 Perigynia 3.2–4.2 mm; culms more robust, 21–47 cm; leaves shorter than culms. Carex peckii 21 Culms 10–45 cm, usually more than 20 cm; bases (remnants
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blade elliptic to linear, orbiculate, lanceolate, or ovate, [0.3–] 0.4–15 (–21) cm, leathery to membranous, margins flat or revolute, entire, venation pinnate
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ciliatus: Evidence from morphology, cytology and DNA fingerprinting. Aliso 20:21-36 Saarela, J.M., P.M. Peterson, and J. Cayouette. 2005. Bromus hallii (Poaceae)
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glabrous, tooth apices acute. Euphrasia micrantha 19 Corollas 3–5.5 mm. > 21 21 Stems branched from middle and/or distal cauline nodes, branches erect; cauline
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vaseyi Sharon C. Yarborough, A. Michael Powell Treatment appears in FNA Volume 21. Treatment on page 320. Mentioned on page 317, 321. Annuals, perennials, or
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single, and lopos, husk, alluding to phyllaries Treatment appears in FNA Volume 21. Treatment on page 349. Mentioned on page 335, 336. Dioecious. Plants 3–14
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Undefined sect. Crockeria Greene ex A. Gray Treatment appears in FNA Volume 21. Treatment on page 342. Mentioned on page 337, 343, 346. Annuals. Leaves entire
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kline, bed, alluding to conic receptacles Treatment appears in FNA Volume 21. Treatment on page 478. Mentioned on page 461, 462, 481. Perennials, 50–200
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arrangement of exostome teeth Treatment appears in FNA Volume 28. Treatment on page 21. Mentioned on page 15, 650, 663. Plants in dense tufts, often brown proximally
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midvein extending to tip. > 21 21 Perigynium body obovate, often with conspicuous “shoulders;” leaves 2.5–6 mm at widest. Carex alata 21 Perigynium body elliptic
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white-haired involucre of Geraea canescens Treatment appears in FNA Volume 21. Treatment on page 122. Mentioned on page 65, 66, 119. Annuals or perennials
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Sanvitali or for a Spanish botanist named Sanvital Treatment appears in FNA Volume 21. Treatment on page 70. Mentioned on page 64, 65. Annuals or perennials, (3–)
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1749–1831, British physician and botanist Treatment appears in FNA Volume 21. Treatment on page 140. Mentioned on page 135. Annuals, perennials, or subshrubs
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Fruits capsules, erect, nearly sessile, ellipsoid to sausage-shaped. x = 21. Temperate regions, North America (including Mexico) Species 10 (10 in the
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Göttingen, known for botanical studies in Mexico Treatment appears in FNA Volume 21. Treatment on page 71. Mentioned on page 3, 64, 65, 72, 74. Annuals or subshrubs
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