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Lincoln Constance & Margriet Wetherwax, except as noted

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


1 sp. (Y. 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 generally 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, ± bilateral; calyx lobes evident; petals obovate, white, tips narrowed; styles short. Fruit: oblong, compressed side-to-side; 1° ribs bristly, alternate with prickly wings; oil tubes 1 per interval between 1° ribs; fruit axis divided in distal 1/4. Seed: face deeply grooved.
2n=12. Grassy slopes, dunes, chaparral, woodland; < 1500 m. California Floristic Province, Mojave Desert; to Washington, Idaho, Arizona, Baja California. [Caucalis microcarpa Hook. & Arn.] Apr–Jun [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Yabea, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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click for enlargement Yabea microcarpa
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2005 Keir Morse

Geographic subdivisions indicated for the distribution of Yabea microcarpa Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.