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.

EUCLIDIUM

Annual; hairs simple or not
Leaves simple; basal lobes 0
Inflorescence spike-like, open
Flower inconspicuous, ± sessile; sepal bases not sac-like; petals spoon-shaped, white
Fruit sessile above receptacle, 2-chambered, tardily dehiscent; beak short-tapered
Seeds 2; embryonic root at edges of both cotyledons
Species in genus: 2 species: Eurasia
Etymology: (Greek: tightly closed, from fruit)

Introduced

E. syriacum (L.) R. Br.

Plant branched from near base
Stem 1–4 dm, rigid
Leaves: basal rosette 0; cauline with dense, generally simple and forked hairs, lower 1–5 cm, lanceolate, entire to dentate, petioled, upper oblong to oblanceolate, entire to obscurely dentate, sessile
Flower: petals 1–1.3 mm, white
Fruit 2–3 mm, ovate to ± round, plump; hairs dense, simple and forked, whitish; pedicel erect, appressed, stout, 0.7–1 mm; beak curved away from axis
Chromosomes: 2n=14
Ecology: Roadsides, disturbed pastures
Elevation: 1200–1500 m.
Bioregional distribution: s Modoc Plateau (Lassen Co.)
Distribution outside California: to Washington, Colorado; native to Eurasia

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