Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
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.



David J. Keil, Family Editor and author, except as specified

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.



John C. Semple

Annual to perennial herb, taprooted, branched above, strigose-bristly; hairs minutely knobby
Leaves generally ± cauline, alternate; lower oblanceolate to ovate, base or petiole ± spreading-hairy; upper reduced, glandular
Inflorescence ± flat-topped; heads generally radiate; involucre ± bell-shaped; phyllaries in 3–5 graded series; receptacle naked, pitted
Ray flowers (0)10–30(40); ligules yellow
Disk flowers many; corollas yellow; style branches finely papillate, appendage narrowly triangular
Fruit obconic; ray fruit ± 3-angled, pappus 0 or of bristles; disk fruit compressed, outer pappus of narrow scales < 1 mm, inner of 30–45 bristles 3–7 mm
Species in genus: ± 30 species: especially w North America
Etymology: (Greek: different cases, from ray and disk fruits)
Reference: [Semple 1990 Brittonia 42:221–228]


H. sessiliflora (Nutt.) Shinners

Perennial 1–13 dm, ± bristly to woolly, ± glandular above
Leaves: lower tapered; upper ± sessile, 1–5 cm
Inflorescence: involucre 8–14 mm, generally not subtended by leaf-like bracts, ± hairy and glandular
Ray flowers 3–30; ligules 3–10 mm
Disk flowers 20–50; corollas 3–10 mm; lobes generally sparsely hairy
Ecology: Dunes, grassland, oak woodland
Elevation: < 2700 m.
Bioregional distribution: c&s North Coast, n Central Coast, c&s Sierra Nevada Foothills, Tehachapi Mountain Area, San Joaquin Valley, Central Western California, South Coast, Transverse Ranges, Peninsular Ranges
Distribution outside California: Baja California
Highly variable, especially in CW; subspp. ± merge where ranges overlap.

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bioregional map for HETEROTHECA%20sessiliflora being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Heterotheca sessiliflora
Retrieve dichotomous key for Heterotheca
Retrieve multiple-entry key (MEKA) for Heterotheca
Overlay Consortium of California Herbaria specimen data by county on this map
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