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.
STREPTANTHUS
JEWELFLOWER
Roy E. Buck, Dean W. Taylor, and Arthur R. Kruckeberg
Annual to perennial herb, glabrous to bristly, generally ± glaucous
Leaves ± entire to pinnately compound; basal generally rosetted, generally ± petioled; cauline linear to (ob)ovate, often clasping
Inflorescence generally ± open; bracts generally 0
Flower biradial or bilateral; calyx generally ± urn-shaped, sepals erect, generally not green, bases ± pouch-like, generally keeled; petals generally exserted, blade generally narrower than claw, ± channeled, margins ± wavy, generally ± scarious; stamens generally in 3 free pairs; style 0 or short, stigma generally ± entire, blunt
Fruit long, generally strongly compressed parallel to septum
Seeds generally compressed, generally ± winged
Species in genus: ± 40 species: sw US, n Mex
Etymology: (Greek: twisted flower, from wavy-margined petals)
Reference: [Dolan & LaPré 1989 Madroño 36:33–40; Kruckeberg & Morrison 1983 Madroño 30:230–244]
Caulanthus sometimes including here. Calluses on leaf margins of some mimic pierid butterfly eggs, reducing larval herbivory. Variable, complex; needs study.
| Native |
S. diversifolius S. Watson
VARIED-LEAVED JEWELFLOWER
Annual 4–6 dm, simple or branched above
Leaves: basal 7–12 cm, simple or 2-pinnate, segments thread-like, axis sometimes winged; upper cauline leaves entire, widely lanceolate to round
Inflorescence: bracts 1–2, like upper cauline leaves
Flower: calyx somewhat narrowed at tip, sepals 5–6 mm, yellow or light purple, margins whitish; petals 8–9 mm, white or yellowish, veins purple; filaments free, upper pair exserted, recurved, with ± reduced fertile anthers
Fruit reflexed, 4–8 cm, straight or ± curved, wide, flat
Seed narrowly winged at ends
Chromosomes: 2n=28
Ecology: Open woodlands, rocky slopes
Elevation: < 1600 m.
Bioregional distribution: c&s Sierra Nevada FoothillsHorticultural information: DRN, SUN, DRY: 7, 14, 15, 16; DFCLT.
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