|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual, biennial, perennial herb (rarely shrub, tree), often from taproot
Stem often ± scapose, generally ribbed, hollow
Leaves basal and generally some cauline, generally alternate; stipules generally 0; petiole base generally sheathing stem; blade generally much dissected, sometimes compound
Inflorescence: umbel or head, simple or compound, generally peduncled; bracts present (in involucres) or not; bractlets generally present (in involucels)
Flowers many, small, generally bisexual (or some staminate), generally radial (or outer bilateral); calyx 0 or lobes 5, small, atop ovary; petals 5, free, generally ovate or spoon-shaped, generally incurved at tips, generally ± ephemeral; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a ± conic, persistent projection or platform on top subtending 2 free styles
Fruit: 2 dry, 1-seeded halves that separate from each other but generally remain attached for some time to a central axis; ribs on each half 5, 2 marginal and 3 on back; oil tubes 1several per interval between ribs
Genera in family: 300 genera, 3,000 species: ± worldwide, especially temp; many cultivated for food or spice (e.g., Carum, caraway; Daucus; Petroselinum); some highly toxic (e.g., Conium). Underground structures here called roots, but true nature remains problematic. Mature fruit generally critical in identification; shapes generally given in outline, followed by shape in X -section of 2 fruit halves together.
Perennial, glabrous, often glaucous; roots tuberous, single or clustered, or fibrous, clustered
Stem erect, branched
Leaf: blade lanceolate to triangular-ovate, generally 12-ternate-pinnate or 12-pinnately or ternate-pinnately dissected, leaflets or segments generally linear to linear-lanceolate
Inflorescence: umbels compound; bracts 0many, conspicuous and reflexed or not; bractlets severalmany, narrow, ± scarious; rays, pedicels fewmany, generally spreading-ascending; 2° umbels generally convex on top
Flower: calyx lobes evident; petals generally obovate, white, tips narrowed
Fruit linear-oblong to round, slightly compressed side-to-side or not at all, glabrous; ribs subequal, thread-like to prominent, not winged; oil tubes per rib-interval 1several; fruit axis divided to base
Seed: face flat to grooved
Species in genus: ± 12 species: generally w Am
Etymology: (Greek: around the neck, from involucre)
Reference: [Chuang & Constance 1969 Univ Calif Publ Bot 55]
Roots, basal leaves needed for identification.
Plant 715 dm; roots fibrous, slightly thickened, 515-clustered, 315 cm
Leaf: basal petiole 36 cm, often wholly sheathing; basal blade 1545 cm wide, lanceolate to triangular-ovate, 12-ternate-pinnate, leaflets 312 cm, 28 mm wide, linear to lanceolate, entire; cauline leaves 1-ternate-pinnate
Inflorescence: peduncle 518 cm; bracts 810, 515 mm, linear-lanceolate, acuminate, scarious-margined, sharply reflexed; bractlets ± 10, 35 mm, linear-lanceolate; rays 920, 26.5 cm, subequal, spreading-ascending; pedicels 25 mm; 2° umbels 2327-flowered
Flower: petals 1-veined; styles 0.81 mm
Fruit 45 mm, elliptic-oblong; ribs thread-like; oil tubes per rib-interval 1
Ecology: Open grassland, serpentine outcrops
Elevation: < 1000 m.
Bioregional distribution: North Coast, Cascade Range Foothills, n&c Sierra Nevada Foothills, Central Coast, San Francisco Bay Area
Horticultural information: SUN: 7, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.