Jepson Flora Project: Jepson Interchange    

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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.



Lincoln Constance

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 1–several 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; rhizome divided internally into chambers, with sap that oxidizes to reddish brown, bearing fibrous or tuberous roots
Stem erect, hollow
Leaf: blade oblong to triangular-ovate, 1–3-pinnate or ternate-pinnate, leaflets linear to ovate-lanceolate, serrate or irregularly cut
Inflorescence: umbels compound; bracts generally 0; bractlets generally inconspicuous; rays, pedicels many, spreading
Flower: calyx lobes minute; petals wide, white, tips narrowed
Fruit ovate to round, slightly compressed side-to-side; ribs low, corky, sometimes unequally spaced; oil tubes per rib-interval 1; fruit axis divided to base
Seed: face flat or concave
Species in genus: ± 4 species: Eurasia, North America
Etymology: (Ancient Latin name)
Reference: [Mulligan & Munro 1981 Canad J Plant Sci 61:93–105]
More evidence from ripe fruit and chromosomes needed to substantiate proposed cryptic species TOXIC: both species below contain cicutoxin, a virulent poison; many livestock and human deaths recorded. The most lethally toxic native plants.


C. douglasii (DC.) J.M. Coult. & Rose

Plant 15–30 dm
Leaf 1.5–4.5 dm, narrowly ovate to triangular-ovate, 1–2(3)-pinnate; leaflets 1–10(15) cm, linear to widely lanceolate, acute or acuminate, subentire to coarsely serrate, areas surrounded by veins on lower surface coarse, generally some elongate
Inflorescence: umbels compound, terminal and lateral; peduncles 2–18 cm; rays 15–30(35), 2–8 cm; pedicels 20–30, 2–10 mm
Fruit 2–4 mm, generally round; ribs much wider than intervals between
Chromosomes: 2n=44
Ecology: Wet places, often in water
Elevation: < 2500 m.
Bioregional distribution: North Coast, High Cascade Range, High Sierra Nevada, Central Coast, South Coast, Great Basin Floristic Province
Distribution outside California: to British Columbia, Montana
Flowering time: Jun–Sep

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