|University of California, Berkeley|
|Directory News Site Map Home|
Key to families | Table of families and genera
This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.
Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. 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.
Annual, biennial ( perennial herb); hairs minute, many-branched, tree-like, occasionally mixed with fewer simple hairs, club-shaped glandular papillae occasionally present.
Stem: generally branched distally.
Leaf: petioled, finely 1–3-pinnately lobed or divided, basal generally early- deciduous; cauline similar to basal, less divided distally on stem, base not lobed.
Flower: sepals erect to spreading, base not sac-like; petals obovate, yellow [± white].
Fruit: silique or silicle, dehiscent, linear, oblong, club-shaped, ellipsoid, or obovoid, not flattened, unsegmented; stigma entire.
Seed: 5–100, in 1 or 2 rows, ellipsoid to oblong, plump; wing 0.
45–47 species: Eurasia, especially North America and South America, Canary Islands. (F. Descourain, French botanist, 1658–1740) May be TOXIC to livestock. [Detling 1939 Amer Midl Naturalist 22:481–520] Taxonomically difficult, most characters highly variable.
Unabridged note: A taxonomically difficult genus due to extensive variation and continuity in most characters. The extensive interspecific hybridization, polyploidy, fertility among species, weedy tendencies of hybrids and parents, and lack of reliable morphological characters make it difficult to delimit taxa. Numerous infraspecific taxa have been recognized, but without extensive cytological, molecular, and experimental studies, recognition of narrowly defined taxa is neither practical nor useful.
1. Fr sparsely hairy at least in youth ..... D. adenophora
1' Fr glabrous
2. Fr fusiform, obovate, club-shaped, or ellipsoid (broadly linear, widest distally)
3. Fr fusiform, obovate, or broadly ellipsoid; seeds 4–12, in 1(2) row per chamber; valve midvein obscure
4. Fr fusiform, both ends long-acute; style (0.2)0.3–0.6(0.8) mm; stem (1.3)2–10.5(13.5) dm, simple at base, branched distally ..... D. californica
4' Fr obovate, tip obtuse, acute at base; style 0.05–0.3 mm; stem (0.8)1.5–3.2(4.1) dm, branched throughout ..... D. paradisa
3' Fr club-shaped (broadly linear, widest distally); seeds 16–40, in 2 rows per chamber; valve midvein prominent ..... D. pinnata
5. Infl axis glabrous, nonglandular ..... subsp. glabra
5' Infl axis sparsely to densely hairy, glandular or not
6. Plant sparsely to densely hairy (canescent), generally glandular; sepals yellow or lavender ..... subsp. brachycarpa
6' Plant densely canescent, generally not glandular; sepals purple or rose ..... subsp. ochroleuca
2' Fr linear
7. Fr appressed; pedicel erect to erect-ascending ..... D. incana
7' Fr not appressed; pedicel widely spreading to ascending
8. Fr septum with 2- or 3-veined central band; leaves 2- or 3-pinnately lobed ..... D. sophia
8' Fr septum not veined; leaves 1-pinnately lobed
9. Fr 3–8(10) mm; petals 0.7–1.2 mm; seed 0.5–0.8 mm; plant not glandular ..... D. nelsonii
9' Fr (8)12–35 mm; petals 1.7–3 mm; seed 0.7–1.5 mm; plant glandular or not
10. Ultimate segment of cauline leaves oblong to lanceolate, dentate to incised (pinnately lobed); fruit straight or strongly incurved ..... D. incisa subsp. incisa
10' Ultimate segment of cauline leaves linear, entire; fruit straight or ± incurved ..... D. longipedicellata
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].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.