TREATMENT FROM THE JEPSON MANUAL (1993) |
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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 1many 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 80:686699; Rollins 1993 Cruciferae of Continental North America. Stanford Univ Press]
Family description, key to genera by Robert A. Price.RORIPPA
YELLOW or WATER CRESS
Annual, biennial, perennial herb; hairs simple, rarely sac-like
Stems 1many, prostrate to erect, branched or not, often from center of basal rosette, rooting at nodes or not
Leaves: basal, lower cauline sessile or short-petioled, entire to pinnately compound; cauline reduced upward
Inflorescence terminal and lateral
Flower generally small; petals 0 or obovate to narrowly spoon-shaped, pale to bright yellow or white
Fruit linear to round, plump; valves 2 or 4(6); pedicel ascending to recurved, slender, generally with 2 minute glands at base; style 0 or prominent, persistent
Seeds 10200, (1)2 rows per chamber, dense, generally plump; wing 0; embryonic root at edges of both cotyledons
Species in genus: ± 75 species: worldwide
Etymology: (Old Saxon: for these, perhaps other crucifers)
Reference: [Stuckey 1972 Sida 4:277340]
Native R. curvisiliqua (Hook.) Britton
Annual, biennial
Stem prostrate to erect, 14(5) dm; branches many; hairs 0 or sparse
Leaf 27 cm, generally oblong-oblanceolate, ± entire to deeply pinnately lobed; lobes linear to ovate, entire or dentate
Flower 12 mm; sepals spreading; petals yellow
Fruit 615 mm, < 1.5 mm wide, linear to oblong, ± cylindric, upcurved or straight; pedicel ascending to ± recurved, 24 mm; style 0.31 mm
Seed finely papillate
Ecology: Uncommon. Streambanks, seepage areas, lake shores
Elevation: < 900 m.
Bioregional distribution: California Floristic Province
Distribution outside California: to Alaska, Rocky Mtns
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