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.

THELYPODIUM

Winter annual to biennial, perennial herb; hairs 0 or simple
Stem generally erect, branched or not
Leaves: basal generally rosetted, petioled, generally shed early, entire to pinnately lobed; cauline petioled or sessile, often clasping
Flower: sepals erect to reflexed, greenish, white, lavender, or purplish, bases sac-like or not; petals linear to oblanceolate, white, lavender, or purple; stamens equal or 4 long, 2 short, paired filaments rarely ± fused
Fruit erect or spreading, narrowly linear, ± narrowed between seeds, cylindric or ± flat parallel to septum, generally stalked above receptacle; pedicel ± flat at base or not, generally expanded at tip; stigma in width < style tip, generally entire
Seeds 1 row per chamber, ± flat; wing generally 0; embryonic root at edge or toward back of 1 cotyledon
Species in genus: 20 species: w North America
Etymology: (Greek: female foot, from fruit stalk above receptacle)
Reference: [Al-Shehbaz 1973 Contr Gray Herb 204:1–148]

Native

T. howellii S. Watson subsp. howellii

Biennial
Stem 1, 1–9 dm, branched above; hairs sparse to dense below, 0 above
Leaves: basal 2–10 cm, oblanceolate, few-lobed, rarely entire or dentate, hairs 0 or sparse; cauline sessile, 1–10 cm, linear to lanceolate, sagittate, ± clasping stem, entire, glabrous, glaucous
Flower: petals spoon-shaped, lavender to purple, blades 0.5–1.2 mm wide, ± crinkled at base; paired filaments partly to completely fused
Fruit 1.5–4.5 cm, cylindric, ± incurved, narrowed between seeds; stalk above receptacle 0.5–1(3.5) mm; pedicel ascending, 3–8 mm, stout, straight or ± curved; style 1–3 mm
Seed plump; embryonic root near back edge of 1 cotyledon
Ecology: Alkaline meadows, sagebrush scrub
Elevation: 1200–1550 m.
Bioregional distribution: Modoc Plateau
Distribution outside California: to Washington
See the CNPS Inventory for information about endangerment and rarity.
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