Crepis occidentalis

Nuttall

J. Acad. Nat. Sci. Philadelphia 7: 29. 1834.

Common names: Gray or western hawksbeard
IllustratedEndemic
Synonyms: Psilochenia occidentalis (Nuttall) Nuttall
Treatment appears in FNA Volume 19. Treatment on page 232. Mentioned on page 225, 226.

Perennials, 8–40 cm; taproots deep, caudices swollen, (often covered with old leaf-bases). Stems 1–3, erect, stout, branched from bases or beyond, hispid, tomentose, or tomentulose, sometimes stipitate-glandular distally. Leaves basal and cauline; petiolate; blades elliptic, runcinate, (5–) 8–20 × 2–5 cm, margins pinnately-lobed to sinuously dentate (lobes broadly lanceolate, often dentate), apices acute or acuminate, faces gray-tomentose, sometimes stipitate-glandular. Heads 2–30, in loose corymbiform arrays. Calyculi of 6–8, lanceolate or linear, glabrate to tomentose bractlets 2–6 mm. Involucres cylindric, 11–19 × 5–10 mm. Phyllaries 7–13, lanceolate, 12–15 mm, (bases thickened, keeled, margins green, often scarious) apices acute or acuminate, abaxial faces gray-tomentose, sometimes setose (setae black or greenish) or stipitate-glandular, adaxial glabrous or with fine hairs. Florets 10–40; corollas yellow, 18–22 mm. Cypselae golden or dark-brown, subcylindric, 6–10 mm, apices tapered (not beaked), ribs 10–18, strong and rounded; pappi yellowish white, 10–12 mm (bristles unequal). 2n = 22, 33, 44, 55, 66, 77, 88.

Distribution

V19-296-distribution-map.gif

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

Discussion

Subspecies 4 (4 in the flora).

Crepis occidentalis is recognized by the old, brown leaf bases persisting on caudices, by stems, leaves, and phyllaries gray-tomentose, and by loose, corymbiform arrays with relatively few, relatively large heads. It is widespread and polymorphic. Some specimens have coarse setae or black, stipitate glands on the phyllaries in addition to the tomentose indument, the stipitate glands sometimes extending proximally on stems. Four intergrading subspecies were recognized by E. B. Babcock (1947). The sexual diploid forms are found in subsp. occidentalis and occur in northern California and adjacent Nevada. The other subspecies are polyploid and apomictic (Babcock).

Selected References

None.

Key

1 Phyllaries sparsely to densely stipitate-glandular > 2
1 Phyllaries 8–12, usually eglandular, if glandular, phyllaries 8 > 3
2 Phyllaries (peduncles and distal cauline leaves) stipitate-glandular (lacking large dark or black glandular setae); phyllaries 7–8 or 10–13; florets 18–30 Crepis occidentalis subsp. occidentalis
2 Phyllaries (peduncles and distal cauline leaves) stipitate-glandular (and with dark or black, glandular setae); phyllaries 8, florets 10–14 Crepis occidentalis subsp. costata
3 Plants 10–40 cm (stems with definite primary axes, branched distally; phyllaries mostly 8; leaves coarsely dentate or pinnately lobed (lobes closely spaced) Crepis occidentalis subsp. pumila
3 Plants 5–20 cm (stems branched proximally; phyllaries 8–12; leaves deeply pinnately lobed (lobes remotely spaced, lanceolate, or linear, entire or dentate) Crepis occidentalis subsp. conjuncta

"fine" is not a number."fine" is not a number.

... more about "Crepis occidentalis"
88 +, 77 +, 66 +, 55 +, 44 +, 33 +  and 22 +
stipitate-glandular +, setose +  and gray-tomentose +
with fine hairs +  and glabrous +
scarious +
ovate +  and lanceolate +
indeterminate +  and determinate +
David J. Bogler +
Nuttall +
runcinate +, lyrate +, lanceolate +  and linear or spatulate +
decurrent +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
runcinate +
2cm;5cm +
tuberculate +, rugose +, muricate +  and smooth +
setose +, tomentulose +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
filiform +
glabrate +  and tomentose +
lobing +, entire +  and lobed +
Gray or western hawksbeard +
zygomorphic +, actinomorphic +  and (3-)5-merous +
1.8 cm18 mm <br />0.018 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
dark-brown +  and golden +
subcylindric +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
stipitate-glandular +  and gray-tomentose +
winged +  and beaked +
dispersed +
indeterminate +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cauline +  and basal +
toothed +
dentate +  and entire +
green +  and yellowish +
pinnately-lobed +  and sinuously dentate +
2-carpellate +
yellowish white +
persistent +
connate +  and distinct +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
connate +  and distinct +
7 +  and 13 +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
J. Acad. Nat. Sci. Philadelphia +
hairy +  and glabrous +
convex;flat +
10 +  and 18 +
spiculate-roughened +
rounded +
exalbuminous +
Illustrated +  and Endemic +
1 +  and 3 +
appendaged +  and truncate +
papillate +
Psilochenia occidentalis +
Crepis occidentalis +
species +
taprooted +  and rhizomatous +
8 cm80 mm <br />0.08 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +
11 +, 6 +, 5 +, 4 +  and 3 +