Flowers unisexual; perianth absent; stamens 1–3; anthers 2–4 mm, apex usually mucronate or awned; styles linear, 2–3-fid, base deciduous or persistent, hypogynium
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the flora and plant geography of west Greenland II. Meddel. Grønland 1477 (7): 11--23. Jarolimova, V. and Kirschner, J. 1995. Tetraploids in Luzula multiflora
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absent, sometimes present (in R. californica and R. lindheimeri), (2.4–) 3.5–14.5 mm; sepals deciduous or persistent (when persistent, usually only upper;
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axillary, less commonly axillary and terminal; cymes 1–7 (–10) -flowered. Pedicels erect to spreading, 0.5–7 mm. Flowers usually closed, sometimes semi-open; tepals
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rarely glaucous adaxially (P. nuttallii); 1-veined or venation parallel (3-veined), secondary-veins not conspicuous. Inflorescences usually axillary and
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coriaceous, firm to floppy, base narrowly cuneate to rounded, lobes 0 or 1–3 per side, sinuses usually shallow, lobe apex acute to obtuse, margins entire
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acuminate, usually unawned, occasionally awned, awns to 0.3 mm; calluses bearded; lemmas of bisexual florets 3-veined, marginal veins pubescent, midveins usually
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anthers dehiscing by longitudinal slits; pistil 1, [2–] 3–10 [–15] -carpellate, ovary superior, [2–] 3–10 [–15] -locular, placentation axile; ovules 2 per
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or in ± corymbiform, cymiform, or paniculiform arrays. Calyculi usually of 3–8 (–21+) bractlets or bracts (usually ± herbaceous, usually shorter than phyllaries
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Common names: Rockcress Etymology: Latin Arabia Treatment appears in FNA Volume 7. Treatment on page 257. Mentioned on page 226, 234, 242, 258, 264, 348, 349
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corollas 6–12 mm. Cypselae tan, turbinate to cylindric or oblanceoloid, 3–8 mm, glabrous or hairy (often ± pilose or sericeous); pappi whitish, 3–13 mm. 2n = 18
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15–50 × 4–12 mm, margins entire or fimbriate; ovary scaly, spineless; stigma lobes 5–12, pink, green, yellow, or creamy white, 1.5–3.5 mm. Fruits dehiscent
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gibbous (forming a prominent or obscure pouch) adaxially, lobes 5, abaxial 3, 2 as wings, middle lobe of abaxial lip (keel) folded lengthwise, enclosing
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487, 498, 504, 50. Annuals, biennials, perennials, subshrubs, or shrubs, 3–350 cm (usually, rarely not, aromatic). Stems 1–10+, usually erect, usually
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veins obscure or prominent, apices unawned; lower glumes 1 (3) -veined; upper glumes (1) 3 (5) -veined; calluses blunt, glabrous or pubescent; lemmas membranous
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and shape. Indusia present. x = 36. Worldwide Species ca. 700 (28 species, 3 nothospecies in the flora). None. Asplenium abscissum, Asplenium adiantum-nigrum
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singly. Involucres obconic to turbinate or campanulate, (3–9.5 ×) 2–8 mm. Phyllaries 15–30 in (3–) 4–6 series, 1-nerved (midnerves usually barely evident;
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corymbiform arrays. Involucres obconic to hemispheric, 4–15+ mm diam. Phyllaries 5–13+ in 2–3+ series, subequal, usually membranous or scarious-margined
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glabrous or pubescent; beak 0.5–3 mm, ca. 1/2 length of body, orifice entire to bidentate, teeth to 1 mm. Stigmas 3. Achenes trigonous, smaller than to
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tawny, barbellate, apically attenuate bristles in 1–3 series. x = 4. w North America, n Mexico Species 3 (3 in the flora). Dieteria has often been included
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