|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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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 from taproot or generally deep-seated tuber, glabrous to tomentose
Stem 0 or erect, simple or branched; base fibrous (from old leaf sheaths) or not
Leaf: blade oblong to triangular-ovate or obovate, ternately, pinnately, or ternate-pinnately dissected or compound, segments or leaflets thread-like to wide
Inflorescence: umbels compound, peduncled; bracts generally 0; bractlets generally present, 0 to conspicuous; rays, pedicels spreading to erect, often webbed at base
Flower: calyx lobes generally 0; petals wide, yellow, white, or purple, tips narrowed; projection atop ovary 0
Fruit linear to obovate, very compressed front-to-back; marginal ribs widely to narrowly thin or thick-winged, others thread-like; oil tubes per rib-interval 1several; fruit axis divided to base
Seed: face flat to concave
Species in genus: ± 75 species: c&s North America
Etymology: (Greek: bordered, from prominent marginal fruit wing)
Reference: [Schlessman 1984 Syst Bot Monogr 4:155]
Fr wing width expressed as width of 1 wing, not both together.
Plant 0.54 dm; base fibrous; taproot ending in deep-seated tuber; herbage grayish; hairs dense, fine, softSee the CNPS Inventory for information about endangerment and rarity.
Leaf: petiole 210 cm, sheathing to middle; blade 410 cm, oblong to widely ovate, ternate-pinnately or pinnately dissected, segments 14 mm, linear to lanceolate, acute
Inflorescence densely puberulent; peduncle 0.53 dm; bractlets 510, 15 mm, linear, puberulent to hairy, ± fused basally, involucel 1-sided; rays 318, 17 cm, unequal, spreading-ascending; pedicels 210 mm
Flower: corolla white, sometimes purple-tinged; anthers purple; ovary hairs dense, fine
Fruit 68 mm, ovate to round, softly hairy to nearly glabrous; wings < body in width; oil tubes per rib-interval 12
Ecology: Flats, slopes, ridges, often ± alkaline soils, sagebrush, pinyon/juniper woodland
Elevation: 10003000 m.
Bioregional distribution: Modoc Plateau (e Lassen Co.)
Distribution outside California: to Idaho, w Utah
Abundant in se OR.