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Jepson Interchange (more information)
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  • 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.


Species in genus: 1 sp
Etymology: (H. Yabe, Japanese botanist, 1876–1931)


Y. microcarpa (Hook. & Arn.) Koso-Pol.

Annual, slender, ± hairy, taprooted
Stem erect, 3–40 cm
Leaf: petiole 2.5–3.5 cm; blade 2–6 cm, oblong to ovate, pinnately dissected, segments 2–8 mm, thread-like to linear
Inflorescence: umbels generally compound; peduncle 2–10 cm; bracts 2–5, leaf-like, pinnately lobed to compound, 1–5 cm; bractlets 1–5, 1–10 mm, entire or some often 3-lobed at tip or pinnately lobed; rays 1–9, 1–8 cm, unequal, erect or ascending; pedicels 2–9, < 15 mm, erect
Flower minute, slightly bilateral; calyx lobes evident; petals obovate, white, tips narrowed; styles very short
Fruit oblong, compressed side-to-side; 1° ribs bristly, alternating with prickly wings; oil tubes per interval between 1° ribs 1; fruit axis divided in upper 1/4
Seed: face deeply grooved
Chromosomes: 2n=12
Ecology: Grassy slopes, dunes, chaparral, woodland
Elevation: 0–1500 m.
Bioregional distribution: California Floristic Province, especially coast, Sierra Nevada Foothills, San Gabriel Mountains, San Bernardino Mountains, San Jacinto Mountains
Distribution outside California: to Washington, Idaho, Arizona, Baja California
Synonyms: Caucalis m. Hook. & Arn

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