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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Perennial herb, taprooted or roots tuberous; glabrous to hairy. Stem: 0 or short. Leaf: blade oblong to obovate, 1–2-pinnate or -ternate, leaflets wide, margins entire to pinnately lobed. Inflorescence: umbels compound, terminal; peduncle generally > leaf; bracts generally 0; involucel 1-sided; bractlets inconspicuous to leaf-like; rays, pedicels few to many, ascending to reflexed, generally few fertile. Flower: calyx lobes occasionally 0; petals wide, yellow, tips narrowed; styles slender; ovary tip projection inconspicuous. Fruit: oblong to round, ± compressed side-to-side, glabrous; ribs prominent to thread-like, ± equal, unwinged; oil tubes several per rib-interval; fruit axis generally divided ± to base. Seed: face generally grooved or concave.
± 35 species: western North America to northern South America. (I.F. Tausch, Czech botanist, 1793–1848)
1. Peduncle generally < leaf; bractlets large, >> umbels, wide, sharply pinnately lobed, leaf-like ..... T. howellii
1' Peduncle > leaf; bractlets small, < to ± > umbels, narrow, ± entire, not leaf-like
2. Fruit oblong to narrowly elliptic, ribs prominent, acute, ± wing-like; leaf ± leathery
3. Leaf 1-pinnate; rays unequal, spreading-ascending ..... T. arguta
3' Leaf 2-pinnate; rays ± equal, spreading, reflexed ..... T. parishii
2' Fruit ± round, ribs low, obtuse, thread-like; leaf not leathery
4. Plant glabrous, smooth; rays 5–12; pedicel 1–3 mm ..... T. glauca
4' Plant minutely scabrous; rays 10–30; pedicel 2–15 mm
5. Generally several bractlets > flowers, fruits; fruit 4–7 mm, 4–5 mm wide ..... T. hartwegii
5' Generally all bractlets < flowers, fruits; fruit 3–5 mm, 4–6 mm wide ..... T. kelloggii
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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