Jepson Interchange (more information)
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL (1993) |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
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AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.
Annual to subshrubs
Stems from taproot or ± branched caudex
Leaves simple, alternate, entire to pinnately dissected; teeth or lobes often ± bristle-tipped
Inflorescence: heads radiate or discoid, solitary or cymosely clustered; involucre bell-shaped, hemispheric, or obconic; phyllaries in 2–several series of unequal length, basal portion straw-colored to purplish, tips green; receptacle convex, naked or with short, triangular scales (not chaff)
Ray flowers 8–many; corollas yellow, white, pink, blue, or purple
Disk flowers 10–many; corollas yellow; style tips triangular to linear, acute
Fruit linear to club-shaped or obovoid, smooth or several–many-ribbed, glabrous to densely hairy; pappus of many unequal bristles (ray pappus sometimes 0)
Species in genus: ± 35 species: temp w North America
Etymology: (Greek: sword-like anthers)
Reference: [Hartman 1990 Phytologia 68:439–465]
| Native |
Annual, biennial 1–7 dm, puberulent to densely glandular
Stems 1–several from base, generally branched above and ± bushy
Leaves generally 3–12 cm, 1–2-pinnately dissected
Inflorescence: heads radiate; phyllaries generally in 3–5 series, tips elongate, acuminate, spreading to bent backward
Ray flowers many; corollas blue-purple; ligules 1–2 cm
Disk flowers many; corollas 5–7 mm
Fruit 3–4 mm, narrowly obovate, ± flattened; ribs 4–6 on each face, silky; pappus 4–6 mm
Chromosomes: 2n=8
Ecology: Uncommon. Desert scrub, pinyon/juniper woodland
Elevation: ± 1700 m.
Bioregional distribution: e Desert Mountains (New York Mtns)
Distribution outside California: to Montana, South Dakota, Texas, north-central Mexico