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cliff thistle

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

Phenology Flowering summer (Jun–Sep).
Habitat Crevices in limestone or basaltic cliffs
Elevation 900–1500 m (3000–4900 ft)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila)
[BONAP county map]
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 Asteraceae > tribe Cardueae > Cirsium
Sibling taxa
C. altissimum, C. andersonii, C. andrewsii, C. arizonicum, C. arvense, C. barnebyi, C. brevifolium, C. brevistylum, C. canescens, C. carolinianum, C. ciliolatum, C. clavatum, C. crassicaule, C. cymosum, C. discolor, C. douglasii, C. drummondii, C. eatonii, C. edule, C. engelmannii, C. flodmanii, C. foliosum, C. fontinale, C. grahamii, C. helenioides, C. hookerianum, C. horridulum, C. hydrophilum, C. inamoenum, C. joannae, C. kamtschaticum, C. lecontei, C. longistylum, C. mohavense, C. muticum, C. neomexicanum, C. nuttallii, C. occidentale, C. ochrocentrum, C. ownbeyi, C. palustre, C. parryi, C. perplexans, C. pitcheri, C. praeteriens, C. pulcherrimum, C. pumilum, C. quercetorum, C. remotifolium, C. repandum, C. rhothophilum, C. rydbergii, C. scariosum, C. texanum, C. tracyi, C. undulatum, C. vinaceum, C. virginianum, C. vulgare, C. wheeleri, C. wrightii
Name authority Warnock: SouthW. Naturalist 5: 101. (1960)
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