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Key to families | Table of families and genera
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Annual to perennial herb [shrub, tree], generally from taproot. Stem: generally ± scapose, generally ribbed, hollow. Leaf: basal and generally cauline, generally alternate; stipules generally 0; petiole base generally sheathing stem; blade generally much dissected, occasionally compound. Inflorescence: umbel or head, simple or compound, generally peduncled; bracts present in involucres or 0; bractlets generally present in "involucels". Flower: many, small, generally bisexual (or some staminate), generally radial (or outer bilateral); calyx 0 or lobes 5, small; 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 at tip subtending 2 free styles. Fruit: 2 dry, 1-seeded halves (= mericarps), separating from each other but generally ± persistent to central axis; ribs on halves 5, 2 marginal, 3 to back; oil tubes 1–several per interval between ribs.
300 genera, 3000 species: ± worldwide, especially temperate; many cultivated for food or spice (e.g., Carum, caraway; Daucus; Petroselinum); Bupleurum lancifolium Hornem. is historical garden weed; some toxic (e.g., Conium). Mature fruit generally critical in identification, shape given in outline. Hydrocotyle moved to Araliaceae. Petroselinum crispum (Mill.) A.W. Hill is a waif. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Key to Apiaceae
Perennial herb, glabrous; roots clustered, fibrous or ± tuberous. Stem: erect or ascending, branched. Leaf: blade oblong to ovate, 1-pinnate, occasionally 2-pinnate when submerged, leaflets distinct, serrate, irregularly cut to pinnately lobed. Inflorescence: umbels compound, generally opposite a leaf; bracts, bractlets leaf-like, generally reflexed, conspicuous; rays, pedicels many, spreading-ascending. Flower: occasionally ± bilateral; calyx lobes 0 or minute; petals wide, white, narrowed at tips, outer ± > others. Fruit: ovate to round, ± compressed side-to-side; ribs prominent, ± equal, corky; oil tubes 1–3 per rib-interval; fruit axis entire or divided to base, adhering to fruit halves or not. Seed: face flat.
± 10 species: North America, Eurasia, Africa. (Greek: for an aquatic member of family)
Plant 6–12 dm, stout. Leaf: petiole 1–8 dm, segmented; blade 6–25 cm, 7–18 cm wide, leaflets 1–4 cm, linear or lanceolate, serrate, irregularly cut. Inflorescence: peduncle 4–10 cm; bracts 6–10, 3–15 mm, linear or lanceolate, acute, entire to irregularly cut; bractlets 4–8, 1–3 mm, lance-linear; rays 10–20, 1.5–3 cm, ± equal, slender; pedicels 3–5 mm. Fruit: 2–3 mm wide.
2n=12. Swamps, marshes, streambanks; < 2350 m. High Cascade Range, c High Sierra Nevada, deltaic Great Central Valley, Great Basin Floristic Province; to British Columbia, eastern North America; eastern Asia. Jul–Aug [Online Interchange]
Previous taxon: Sium
Next taxon: Spermolepis
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 19 2014
Citation for this treatment: [Author of taxon treatment] 2012. Sium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=44763, accessed on Apr 19 2014
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