papillatum, Polytrichastrum sexangulare G. L. Smith Mem. New York Bot. Gard. 21(3): 35. 1971· [Genus Polytrichum and Latin -astrum, incomplete resemblance]
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differentiated abaxial epidermis; gemmae largely absent. Worldwide Genera 21 (15 in the flora). None. Acaulon, Aloina, Chenia, Crossidium, Crumia, Globulinella
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3-26 mm. Seeds black, obovoid, smooth. x = 7. Circumboreal Species ca. 70 (21 in the flora). Species of Aquilegia are polymorphic and difficult to define
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lanceolate, 5-21 × 1.5-6 cm, base cuneate, apex acute to acuminate. Flowers 2.5-5 cm diam.; peduncle 1-11 cm; bracteoles 3-6; tepals 21-33, red-maroon
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ellipsoid; stipe not more than 0.2 mm. > 21 21 Perigynia prominently veined, apex acute; basal sheaths brown. Carex rufina 21 Perigynia indistinctly veined, apex
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Welsh Basionym: Argenteae Standley in N. L. Britton et al., N. Amer. Fl. 21: 46. 1916 Synonyms: Powellianae Standley Treatment appears in FNA Volume 4
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then leaves alternate) > 21 21 Petals pink; flowers usually slightly bilaterally symmetric; leaves deciduous. Rhododendron 21 Petals white or pink, flowers
33 KB (1,383 words) - 13:10, 30 July 2020
Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume 21. Treatment on page 245. Mentioned on page 5, 253. Annuals, perennials, or
7 KB (473 words) - 23:35, 29 July 2020
Barkley†, Luc Brouillet, John L. Strother Treatment appears in FNA Volume 21. Treatment on page 32. Mentioned on page 6, 7, 33, 38, 41. Annuals, perennials
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> 21 19 Anthers 1.6–2.4 mm Juncus orthophyllus 19 Anthers 0.8–1.5 mm. > 20 20 Tepals 3–4 mm Juncus covillei 20 Tepals 4.5–6 mm Juncus falcatus 21 Tepals
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hairy, or puberulent. > 21 21 Corollas 7–11 mm, throats 2–3 mm diam.; pollen sacs explanate, 0.3–0.6 mm. Penstemon procerus 21 Corollas 10–20 mm, throats
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slightly spreading; culm nodes 1-4. > 21 21 Awns 2-5 mm long; anthers 2-3.5 mm long; blades flat Bromus suksdorfii 21 Awns (4)5-8 mm long; anthers 3-6.5 mm
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mature spikes, those having at least some ripe fruit. Species more than 250 (21 in the flora). Kral, R. 1966b. The genus Xyris (Xyridaceae) in the southeastern
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appearing on ancient coins of the city of Cyrene Treatment appears in FNA Volume 21. Treatment on page 77. Mentioned on page 65, 157. Perennials, 20–250+ cm (fibrous-rooted
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alluding to venation of ray floret corollas Treatment appears in FNA Volume 21. Treatment on page 447. Mentioned on page 415, 416, 437. Annuals or perennials
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Welsh Basionym: Arenariae Standley in N. L. Britton et al., N. Amer. Fl. 21: 52. 1916 Treatment appears in FNA Volume 4. Treatment on page 360. Mentioned
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or descending > 21 20 Fruits erect, ascending, or horizontal > 29 21 Biennials; basal leaf blades 10-30 mm wide. Boechera canadensis 21 Perennials; basal
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grappling-hook trichomes only; se California and s Nevada (including Nye County). > 21 21 Leaf blades 5.8–9.1 mm wide, widest intersinus distances 4.6–7.1 mm; margins
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(Christophorus Enzelius), 1517–1583, German naturalist Treatment appears in FNA Volume 21. Treatment on page 118. Mentioned on page 65, 66, 119, 120. Perennials, subshrubs
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ellipsoid to slightly obovoid, 3-ribbed. Seeds cylindric-fusiform. x = 20, 21. Mostly temperate regions, North America, Central America, 1 circumboreal
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