Crepis intermedia

A. Gray in A. Gray et al.

in A. Gray et al., Syn. Fl. N. Amer. 1(2): 432. 1884

Common names: Limestone or small-flower hawksbeard
Endemic
Synonyms: Crepis acuminata var. intermedia (A. Gray) Jepson
Treatment appears in FNA Volume 19. Treatment on page 229. Mentioned on page 224, 225, 233, 234.

Perennials, 25–60 cm (taproots stout or slender, caudices swollen, simple or branched, covered with brown leaf bases). Stems 1–2, erect, branched (proximal branches elongate, branched distally), ± tomentose-canescent. Leaves basal and cauline; petiolate (petiole bases clasping); blades elliptic-lanceolate, 10–40 × 2–9 cm, margins pinnately lobed (lobes remote or close, entire or dentate), apices acute or acuminate, faces densely or sparsely gray-tomentose. Heads (10–)20–60, in ± flat-topped, compound, corymbiform or paniculiform arrays. Calyculi of 6–8, narrowly triangular, tomentulose bractlets 2–4 mm. Involucres narrowly cylindric, 10–16 × 3–5 mm. Phyllaries 7–10, (medially green) lanceolate, 10–13 mm (margins scarious), apices acute, abaxial faces ± tomentulose, sometimes with greenish eglandular setae, adaxial with fine hairs. Florets 7–12; corollas yellow, 14–30 mm. Cypselae yellow or golden brown, subcylindric, 6–9 mm, tapered distally, ribs 10–12 (smooth); pappi dusky white, 7–10 mm. 2n = 33, 44, 55, 88.


Phenology: Flowering May–Jul.
Habitat: Open rocky ridges, dry slopes, open forests
Elevation: 800–3900 m

Distribution

V19-287-distribution-map.gif

Alta., B.C., Sask., Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.

Discussion

Crepis intermedia is a somewhat unnatural group of polyploid apomicts that combines the features of multiple species, including C. acuminata, C. pleurocarpa, C. modocensis, and C. atribarba (E. B. Babcock 1947). The plants are usually over 25 cm, with leaves deeply pinnately lobed (gray-tomentose, cleft about halfway to midribs), with acuminate apices, and more or less flat-topped arrays of heads. The leaves vary greatly in size and lobing and are always gray-tomentose. The number of heads per plant is usually more than 20.

Selected References

None.

Lower Taxa

None.

... more about "Crepis intermedia"
David J. Bogler +
A. Gray in A. Gray et al. +
Limestone or small-flower hawksbeard +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
800–3900 m +
Open rocky ridges, dry slopes, open forests +
Flowering May–Jul. +
in A. Gray et al., Syn. Fl. N. Amer. +
Crepis acuminata var. intermedia +
Crepis intermedia +
species +