diatomaceous algae at the U.S. Military Academy Treatment appears in FNA Volume 21. Treatment on page 444. Mentioned on page 3, 415, 416, 445. Annuals, biennials
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Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume 21. Treatment on page 309. Mentioned on page 5. Annuals, biennials, or perennials
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distance to costa at insertion. Drepanocladus 21 Paraphyllia usually present; rhizoids often forming tomentum > 22 21 Paraphyllia absent; rhizoids rarely forming
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pappus, alluding to membranous pappus scales Treatment appears in FNA Volume 21. Treatment on page 309. Mentioned on page 395. Biennials or perennials, to
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Mithridates Eupator, King of Pontus, 132–63 B.C. Treatment appears in FNA Volume 21. Treatment on page 462. Mentioned on page 459, 461, 470, 471. Perennials,
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Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume 21. Treatment on page 176. Mentioned on page 6, 7, 135, 182. Annuals, perennials
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Etymology: Ancient Latin or Greek plant name Treatment appears in FNA Volume 21. Treatment on page 366. Mentioned on page 3, 5, 255, 257, 364, 365, 375. Perennials
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L. Welsh Basionym: Pusillae Standley in N. L. Britton et al., N. Amer. Fl. 21: 50. 1916 Treatment appears in FNA Volume 4. Mentioned on page 355. Leaves
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placenta, wings absent, rarely present. x = 7. North America, nw Mexico Species 21 (21 in the flora). The flowers in Collinsia resemble those of Fabaceae subfam
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in FNA Volume 27. Mentioned on page 3, 4, 6, 9, 10, 11, 12, 15, 16, 19, 20, 21, 22, 23, 26, 27, 28, 29, 30, 32, 33. Plants typically with upright stems,
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name Helianthus and Latin - ella, diminutive Treatment appears in FNA Volume 21. Treatment on page 114. Mentioned on page 65, 66, 67. Perennials, 20–150 cm
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campanulate to cylindric, 5–12 mm diam. Phyllaries persistent, usually 8, 13, or 21 (–30+) in 1–2 series, erect (reflexed in fruit), distinct, (light to dark
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root alluding to resiniferous rootstocks Treatment appears in FNA Volume 21. Treatment on page 93. Mentioned on page 65, 95, 100. Perennials, 10–45 (–100)
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alluding to spiny tips of receptacular paleae Treatment appears in FNA Volume 21. Treatment on page 88. Mentioned on page 43, 64, 65. Perennials, to 140 cm
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jepsonii 18 Leaf blade margins entire, dentate, denticulate, or serrulate. > 21 21 Leaf blade margins entire or remotely denticulate, teeth if present minute
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Texas Cirsium turneri 20 Corollas white to yellow, lavender, or purple > 21 21 Each head closely subtended by involucre-like ring of spiny-margined bracts
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hemispheric or campanulate to cylindric, 3–9 [–12+] mm diam. Phyllaries 5–21 (–40+) in 2+ series, lanceolate to linear, subequal to unequal (reflexed in
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evolution in the Artemisia ludoviciana complex of the Pacific Northwest. Brittonia 21: 29–43. Keck, D. D. 1946. A revision of the Artemisia vulgaris complex in
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circumscribed segregate genus is adopted is included in the synonymy. Species ca. 875 (21 in the flora). Christensen, C. 1913. A monograph of the genus Dryopteris.
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names: Sneezeweed Etymology: For Helen of Troy Treatment appears in FNA Volume 21. Treatment on page 426. Mentioned on page 415, 416. Annuals or perennials
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