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mountain tail-leaf, mountain taper leaf, tail pericome, tail-leaf pericome, taper leaf, yerba del chivato

Stems

striate, terete, glabrous or hairy, often densely puberulent to tomentulose distally, sometimes gland-dotted.

Leaves

petioles (5–)10–45 mm;

blades (2–)3.5–12(–15) × 1–12 cm.

Peduncles

0.5–4 cm.

Involucres

4.5–10 × 4–10 mm.

Disc corollas

tubes 1–3.5 mm, throats 2–5.5 mm, lobes 0.5–1 mm.

Phyllaries

0.5–1 mm wide, apices attenuate.

Heads

3–30+, usually tightly clustered.

Cypselae

3–5 mm;

pappi crowns to ca. 1 mm plus 0–2 bristles 1–4.5 mm.

2n

= 36.

Pericome caudata

Phenology Flowering spring–fall.
Habitat Among rocks, boulders, on talus slopes, bluffs, crags, canyons, disturbed roadsides, in volcanic, limestone, and sandstone substrates
Elevation 1400–3300 m (4600–10800 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; OK; TX; Mexico (Chihuahua)
[WildflowerSearch map]
[BONAP county map]
Discussion

Populations of Pericome caudata may vary in leaf shape, head size, and indument, particularly in some far western and eastern populations. Central populations (e.g., in Colorado, New Mexico, and Arizona) tend to have relatively large, deltate-hastate leaves with long-attenuate tips and capitulescences of medium-sized heads. Specimens from Nevada and California often have smaller, ovate or cordate distal leaves with short-attenuate tips, as well as larger and fewer heads per capitulescence. Oklahoma specimens are often coarsely pubescent with copious glands and have leaves similar to the Nevada and California populations. This variability does not appear to warrant taxonomic distinction, nor does the presence or absence of pappus bristles appear to be taxonomically significant.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 335.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Peritylinae > Pericome
Synonyms P. caudata var. glandulosa, P. glandulosa
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 82. (1853)
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