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.


Species in genus: 1 sp
Etymology: (Greek: feathery bristle, from pappus)


T. incisum (A. Gray) A. Gray

Annual, short-lived perennial herb 5–25 cm, generally ± tomentose
Stems 1–several from base
Leaves simple, basal and cauline, alternate or subopposite, mostly clustered in lower half of plant, 1–3 cm, sessile or tapered to a short, winged petiole; blade acute, sharply dentate or shallowly lobed, densely tomentose, resin-dotted
Inflorescence: heads discoid, solitary; peduncles 3–11 cm, slender, bractless, glandular-puberulent; involucre 6–12 mm diam, hemispheric or bell-shaped, often appearing ± disk-like when pressed; phyllaries in 2 ± equal series, free, 5–7 mm, linear-elliptic, acute; receptacle rounded, naked
Flowers many; corollas 4.5–7 mm, yellow, outermost sometimes enlarged and ± bilateral; style-tips truncate
Fruit 2–3 mm, obpyramidal, glabrous to densely strigose; pappus of 5 scales, each 5–7 mm, dissected into many bristles
Chromosomes: 2n=26
Ecology: Dry slopes, plains
Elevation: < 1000 m.
Bioregional distribution: s Mojave Desert, Sonoran Desert
Distribution outside California: s Nevada, sw Arizona, n Baja California
Flowering time: Feb–May, Oct–Nov
Horticultural information: TRY.

previous taxon | next taxon
bioregional map for TRICHOPTILIUM%20incisum being generated

Retrieve Jepson Interchange Index to Plant Names entry for Trichoptilium incisum
Retrieve dichotomous key for Trichoptilium
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California