24 Petals absent or rudimentary > 25 24 Petals present > 31 25 Capsules cylindric, opening by 8 or 10 teeth > 26 25 Capsules ovoid to globose, opening
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acorn on axillary peduncle 25-100 mm. Quercus robur 5 Leaf base cuneate or attenuate; acorn subsessile or on axillary peduncle 15-25(-50) mm. > 6 6 Leaf blade
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petals 2, plane, ± ovate, ± 2-lobed, clawed, 2-12 mm, nectary absent; stamens 25-40; filaments with base expanded; staminodes absent between stamens and pistils;
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distinct or connate in groups; pistil 1, 1–25-carpellate; ovary superior, inferior, or half-inferior, 1–25-loculed; placentation usually parietal, infrequently
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[winged or carunculate]; endosperm absent; embryo straight [curved]; cotyledons 25–40% of total embryo length. Nearly worldwide except very cold or very dry
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27 Leaves 25–90 mm; heads in cymiform arrays, peduncles 1–15 mm (bracts 0–7, scalelike); florets 10–25 Ericameria arborescens 27 Leaves 10–25 mm; heads
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fibers; leaf blades soft, herbaceous. Schoenoplectus 25 Anthers 3 mm; achenes 2.5–3.5 mm. Schoenoplectus 25 Anthers 1–2.5 mm; achenes 1.5–2.5 mm. > 26 26 Culms
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Lower Taxa Aristida C.E. Hubb. Kelly W. Allred Treatment appears in FNA Volume 25. Treatment on page 314. See subfamily description. The tribe Aristideae has
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puberula 22 Central bract lobes rounded to obtuse, sometimes truncate. > 25 25 Bracts usually distally bright red to red-orange. > 26 26 Leaf margins plane;
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tack-glands); pappus bristles distinct or inner basally connate, white to tawny > 25 25 Heads usually in cymiform, corymbiform, or paniculiform arrays, sometimes
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Tripsacum, Zea Dumort. Mary E. Barkworth Treatment appears in FNA Volume 25. Treatment on page 602. Plants usually perennial. Culms 7-600 cm, annual,
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unbranched or mostly 2–7-branched, sometimes absent; stamens 3; petals 2–25 or 25–90 mm > 25 25 Tendrils usually unbranched, rarely unbranched and 2-branched, sometimes
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crowns of scales) Nipponanthemum 24 Annuals, biennials, perennials > 25 25 Annuals > 26 25 Biennials or perennials > 28 26 Leaves usually irregularly 1-pinnately
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present; blade ± cordate or reniform to narrowly elliptic in outline, 0.5–25 (–30) cm, foliaceous, rarely ± coriaceous; leaflets 3–15 (–41), terminal sometimes
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epaleate, covered with tawny to white bristles or setiform scales. Florets 25–200+; corollas white to pink, red, yellow or purple, ± bilateral, tubes long
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per node), rarely opposite Eutrochium 25 Annuals or perennials; involucres 2–5+ mm diam.; florets 10–30 > 26 25 Perennials, subshrubs, or shrubs; involucres
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phyllaries). Involucres mostly hemispheric or campanulate to cylindric, (1–) 4–12 (–25+) mm diam. Phyllaries persistent, mostly (4–) 8–21 (–30+) in ± 2 series, usually
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crenate, or toothed. Inflorescences terminal or axillary, 2-50-flowered cymes to 25 cm or solitary flowers; bracts present or absent, small or large and leaflike
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Involucres mostly campanulate to hemispheric or turbinate-cylindric, (2.5–) 3–22 (–25) mm diam. Phyllaries persistent or tardily falling, 18–40 in (2–) 3–7 series
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Greenland drabas of the sections Aizopsis and Chrysodraba DC. Svensk Bot. Tidskr. 25: 465–494. Ekman, E. 1932. Contribution to the Draba flora of Greenland. IV
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