Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.


A. brachychaetum (Godr.) Barkworth

Stem 4–10 dm
Leaf: sheath glabrous; blade 1–2 mm wide
Inflorescence 20–30 cm
Spikelet: glumes 6–8 mm, ± equal; floret 4.5–5.5 mm; callus blunt; lemma tip hairs 0.8–1.7 mm, > body hairs, awn 15–20 mm, bent twice
Ecology: Disturbed sites
Elevation: < 300 m.
Bioregional distribution: nw San Joaquin Valley (eradicated from San Joaquin Valley in Fresno Co.), n South Coast
Distribution outside California: native to Argentina
Synonyms: Stipa b. Godr


P. bigelovii Vasey & Scribn.

Annual, cespitose, generally 1.5–4 dm
Leaf: sheath open 1/2–3/4 length; ligule 1.5–6 mm, truncate to obtuse, minutely scabrous; blade 1.5–5 mm wide, soft, generally flat, abruptly prow-tipped
Inflorescence 5–15 cm, ± linear; branches appressed, with spikelets from near base
Spikelet: callus cobwebby; lemma 2.5–4 mm, veins (sometimes between) hairy; palea keels hairy
Flower: anthers 0.2–1 mm
Chromosomes: 2n=28
Ecology: Uncommon. Shady places in desert scrub, yellow-pine forests
Elevation: < 1500 m.
Bioregional distribution: Southwestern California, Desert
Distribution outside California: to Texas, nw Mexico
Flowering time: Early spring.


P. secunda J. Presl

Perennial, densely cespitose, 1.5–10 dm
Leaf: sheath open 3/4 length to near base; ligule 0.5–10 mm, truncate to acuminate, sometimes scabrous; blade generally 0.5–3 mm wide, soft to firm, flat to folded or inrolled
Inflorescence 2–25 cm, often ± 1-sided, generally linear to lanceolate, generally dense; branches generally appressed to ascending (generally spreading only in flower), ± scabrous
Spikelet ± cylindric or little compressed; upper internodes generally > 1.2 mm; callus glabrous or with a ring of short hairs; lemma 3.5–5 mm, weakly keeled to rounded across lower back, glabrous to ± evenly short-hairy across body (rarely soft-hairy only on veins), smooth to scabrous
Flower: anther 1.5–3 mm
Chromosomes: 2n=42–106 (mostly high polyploids)
Ecology: Common. Many habitats
Elevation: 0–3800 m.
Bioregional distribution: California
Distribution outside California: to Alaska, Rocky Mtns, nw Mexico, also in S.America
Many ecological forms; subspp. tend to intergrade.

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