Jepson Interchange (more information)
| Jepson Flora Project: Jepson Interchange |
|
|
TREATMENT FROM THE JEPSON MANUAL (1993) |
previous taxon |
next taxon
Jepson Interchange (more information) |
|
©Copyright 1993 by the Regents of the University of California
|
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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.SINAPIS
Annual, rarely per; hairs 0 or simple, reflexed or spreading
Stem erect, leafy, ± branched
Leaves: basal not rosetted, petioled, pinnately lobed or not, terminal lobe > lateral; upper cauline reduced, sessile, base tapered
Inflorescence terminal, not flat-topped, elongate in fruit; bracts 0
Flower: sepals spreading, yellowish, bases not sac-like; petals yellow to pale yellow
Fruit cylindric to angled or ± flat, hairy or not; beak prominent
Seeds 1 row per chamber, spheric; wing 0
Species in genus: 6 species: Medit, Eurasia
Etymology: (Latin: mustard, from flavor of seeds)
Introduced S. alba L.
WHITE MUSTARD
Annual 2–6 dm; hairs ± sharp, bristle-like, rarely 0
Leaves: lower pinnately lobed, 1–2 dm, terminal lobe > lateral, coarsely dentate
Flower: petals 8–11 mm, pale yellow to whitish
Fruit 20–30 mm, narrowed between seeds or not, few-seeded
Seed pale yellow
Chromosomes: 2n=24
Ecology: Fields, orchards, disturbed areas
Elevation: < 1000 m.
Bioregional distribution: Central Coast, South Coast, expected elsewhere
Distribution outside California: native to Eurasia
Synonyms: Brassica hirta Moench
previous taxon | next taxon
Retrieve Jepson Interchange Index to Plant Names entry for Sinapis alba
Retrieve dichotomous key for Sinapis
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page
Glossary
University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California