Cirsium turneri |
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cliff thistle |
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Habit | Perennials 15–45 cm; stout, branched caudices. |
Stems | 5–30+, horizontal or hanging from cliff sides, thinly appressed gray-tomentose and villous with septate trichomes; branches 0–few, distal, ascending. |
Leaves | blades oblong-elliptic to oblanceolate, 5–30 × 1–5 cm, shallowly to deeply pinnatifid, lobes spreading, triangular, coarsely dentate or lobed, obtuse to acute, main spines slender, 4–10 mm, abaxial faces green or gray-tomentose, villous with septate trichomes along midveins, ± glabrate, adaxial green and glabrous or thinly tomentose, ± glabrate; basal often present at flowering, spiny winged-petiolate; principal cauline sessile, gradually reduced distally; distal oblong, bases ± clasping, usually less deeply lobed and often spinier than proximal. |
Peduncles | 0–1 cm. |
Involucres | cylindric to narrowly campanulate, 3.5–4.5 × 1.5–2 cm, loosely arachnoid, glabrate, finely short-ciliate. |
Corollas | red to reddish purple, 26–27 mm, tubes 3.5–5 mm, throats 7.5–9.5 mm, lobes 12–14 mm; style tips ca. 3 mm. |
Phyllaries | in 5–6 series, imbricate, linear-lanceolate (outer) to linear (inner), entire, abaxial faces without glutinous ridge, apices red to reddish purple, stiffly ascending, long-acuminate, spines straight, 1–10 mm, ± flattened; apices of inner stramineous to red, straight or flexuous. |
Heads | 1–6+, borne singly or in condensed corymbiform arrays. |
Cypselae | stramineous, 5–6 mm, apical collars not differentiated; pappi 20–25 mm. |
Cirsium turneri |
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Phenology | Flowering summer (Jun–Sep). |
Habitat | Crevices in limestone or basaltic cliffs |
Elevation | 900–1500 m (3000–4900 ft) |
Distribution |
TX; Mexico (Chihuahua, Coahuila) |
Discussion | Cirsium turneri is known from the mountains of the Big Bend area of trans-Pecos Texas and adjacent areas of northern Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 144. |
Parent taxa | |
Sibling taxa | |
Name authority | Warnock: SouthW. Naturalist 5: 101. (1960) |
Web links |