Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

BRASSICACEAE

MUSTARD FAMILY

Reed C. Rollins, except as specified

Annual to subshrub
Leaves generally basal and cauline, alternate, generally simple; stipules 0
Inflorescence: generally raceme
Flower bisexual; sepals 4, free; petals (0)4, free, generally white or yellow, often clawed; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed
Fruit: generally capsule ("silique") with 2 deciduous valves, sometimes breaking transversely or indehiscent
Seeds 1–many per chamber
Genera in family: 300+ genera, 3000+ species: worldwide, especially cool regions; some cultivated for food (especially Brassica, Raphanus ) and ornamental
Recent taxonomic note: Recently treated to include Capparaceae [Rodman et al. 1993 Ann Missouri Bot Gard 80:686–699; Rollins 1993 Cruciferae of Continental North America. Stanford Univ Press]
Family description, key to genera by Robert A. Price.

DESCURAINIA

TANSY MUSTARD

Annual, biennial, rarely per; hairs generally minute, generally multibranched, fewer simple, some glandular
Stem branched
Leaves 1–many-pinnately lobed to compound; basal often rosetted but withering
Inflorescence elongating; bracts generally 0
Flower: petals < 3 mm, yellow or whitish, blades obovate, obtuse
Fruit linear to ± obovate, straight or uneven-margined, generally ± cylindric; style < 0.8 mm or 0, stigma generally head-like, entire
Seeds: 1–2 rows per chamber, generally < 1 mm, elliptic, plump, gelatinous when wet; wing 0; embryonic root at back of 1 cotyledon
Species in genus: ± 40 species: worldwide temp
Etymology: (F. Descourain, French botanist, 1658–1740)
Reference: [Detling 1939 Amer Midl Naturalist 22: 481–520]
Relationships, characters of species difficult. May be TOXIC to livestock.

Native

D. pinnata (Walter) Britton

Annual; hairs sparse to dense, multibranched
Stem 1–7 dm; branches 0, below, or above
Leaves lanceolate or oblanceolate to ovate; lower cauline leaves 2-pinnately lobed; upper leaves 1–10 cm, ± 1–2-pinnately lobed or 1-compound; lobes or leaflets linear to widely obovate, hairs glandular or not
Flower: petals 1–3.5 mm, bright yellow to cream
Fruit 4–20 mm, oblong to ± club-shaped; pedicel ascending to spreading, 4–20 mm
Seeds 5–20 per chamber, 2 rows per chamber, 0.5–1 mm
Ecology: Washes, slopes, often saline soils
Elevation: < 2500 m.
Bioregional distribution: Cascade Range, s High Sierra Nevada, Great Central Valley, Central Coast, San Francisco Bay Area, South Coast Ranges, Southwestern California, Great Basin Floristic Province, Desert
Distribution outside California: widespread N.America
8 difficult subspp.

Native

subsp. halictorum (Cockerell) Detling


Stem 1.5–5 dm, often glandular above; branches 0, below, or above
Leaves lanceolate to oblanceolate; basal and lower cauline deeply 2-pinnately lobed, rarely 1-compound, canescent, lobes or leaflets generally acute at tip, linear to narrowly oblong, upper simpler, hairs generally sparser
Flower: sepals 1–2 mm, ± < petals, yellowish or rose; petals < 2 mm, pale yellow to whitish
Fruit ± ascending, 5–20 mm, ± club-shaped; pedicel ± 60–110° from inflorescence axis, 8–12 mm
Seeds 8–20 per chamber, 0.7–1 mm
Chromosomes: 2n=14,28,42
Ecology: Dry streambeds, stable dunes, juniper woodland
Elevation: < 1800 m.
Bioregional distribution: Cascade Range, Southwestern California, Great Basin Floristic Province, Mojave Desert
Distribution outside California: to Texas, Baja California

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