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Crepis acuminata is identified by the narrow, pinnately lobed leaves cleft about half way to the midrib and with long-acuminate apices, heads with relatively few florets, relatively small involucres, and glabrous phyllaries. The fertile diploid form of this species is most widespread (E. B. Babcock 1947). In addition, there are apomictic, polyploid populations. The latter often are more variable in leaf size, shape, and indument, and can be difficult to distinguish from C. pleurocarpa and C. intermedia.
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Description
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Perennials, 20–65 cm (taproots deep, woody, caudices swollen, branched, often covered by old leaf bases). Stems 1–5, erect, stout, branched near or beyond middles, tomentulose (at least proximally). Leaves basal and cauline. petiolate; blades elliptic to lanceolate, 8–40 × 0.5–6(–11) cm, margins deeply pinnately lobed, lobes 5–10 pairs, usually lobed (± halfway to midveins, lobes entire), apices long-acuminate, faces ± tomentulose. Heads 30–70(–100+), in compound, corymbiform arrays . Calyculi of 5–7, triangular, tomentulose bractlets 1–2 mm. Involucres cylindro-campanulate, 8–16 × 2–3 mm. Phyllaries 5–8, (medially green) lanceolate, 8–12 mm, (margins yellowish, often scarious), apices acute (ciliate), abaxial faces usually glabrous, sometimes sparsely tomentulose, adaxial glabrous. Florets 5–10(–15); corollas yellow, 10–18 mm. Cypselae pale yellowish brown, subcylindric, 6–9 mm, apices ± narrowed (not beaked), ribs 12; pappi white, 6–9 mm. 2n = 22, 33, 44, 55, 88.
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Synonym
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Crepis acuminata subsp. pluriflora Babcock & Stebbins; C. angustata Rydberg; C. seselifolia Rydberg
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Crepis acuminata
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Crepis acuminata is a North American species of flowering plant in the family Asteraceae known by the common name tapertip hawksbeard. It is native to the western United States where it grows in many types of open habitat.[2][3]
Description
Crepis acuminata is a perennial herb producing a woolly, branching stem up to about 70 centimeters (28 inches) tall from a taproot. The gray-green leaves are 10–40 cm (4–15+1⁄2 in) long[4] and cut into many triangular, pointed lobes.
The longest, near the base of the plant, may reach 40 cm (16 in) in length. The inflorescence is an open array of flower heads at the top of the stem branches. Each of the many flower heads is about 1.5–2.5 cm (5⁄8–1 in) wide[4] enveloped in smooth or hairy phyllaries. The flower head opens into a face of up to 10 yellow ray florets. There are no disc florets. The fruit is a narrow achene 7 or 8 millimetres (9⁄32 or 5⁄16 in) long tipped with a pappus of white hairlike bristles.[5]
Distribution and habitat
It is native from eastern Washington and eastern California to central Montana, Colorado, and northern New Mexico. It can be found in dry and open areas in sagebrush habitats and coniferous forests.[4]
References
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^ The Plant List, Crepis acuminata Nutt.
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^ Biota of North America Program 2014 county distribution map
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^ Calflora taxon report, University of California, Crepis acuminata Nutt., Long Leaved Hawk's Beard, Tall hawksbeard, long leaved hawksbeard, tapertip hawksbeard
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^ a b c Spellenberg, Richard (2001) [1979]. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.). Knopf. p. 368. ISBN 978-0-375-40233-3.
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^ Flora of North America, Longleaf or tapertip hawksbeard, Crepis acuminata Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 437. 1841.
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Crepis acuminata: Brief Summary
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wikipedia EN tarafından sağlandı
Crepis acuminata is a North American species of flowering plant in the family Asteraceae known by the common name tapertip hawksbeard. It is native to the western United States where it grows in many types of open habitat.
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