E-Flora BC: Electronic Atlas of the Flora of British Columbia

Rorippa tenerrima Greene
yellow cress (Modoc yellowcress)
Brassicaceae (Mustard family)

Introduction to Vascular Plants
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Distribution of Rorippa tenerrima
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Species Information

General:
Annual herb from a taproot; stems decumbent to prostrate, 10-20 cm long, much branched from base; nearly glabrous.
Leaves:
Stem leaves oblong, oblanceolate to spoon-shaped, 2-5 (8) cm long, 8-15 mm wide, short-stalked, without earlike lobes at the bases, generally deeply pinnately lobed, middle lobes oblong to elliptic, 3-6 (10) mm long, 1-4 (9) mm wide, entire.
Flowers:
Inflorescence of ascending, glabrous to rough with minute papillae, 2-4 mm long stalks; petals yellow, 0.6-0.8 mm long, 0.1-0.3 mm wide, oblong to narrowly spoon-shaped; sepals 0.7-1.2 mm long, 0.4-0.6 mm wide, egg-shaped to oblong, not persistent.
Fruits:
Siliques, elongate-cylindric, curved slightly inward, occasionally outward, 3.5-8.5 mm long, obtuse below, tapering to apices, sparsely to densely minutely pimpled; beaks 0.5-1 mm long, broadened below, gradually merging into the pointed apex; seeds reddish-brown, 0.5-0.7 mm long, widely kidney-shaped, smooth, 20-40.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to wet streambanks, marshes, wet meadows, mud flats and lake margins in the lowland, steppe and montane zones; infrequent in S BC; E to SK and S to ND, SD, OH, NM, AZ, CA and N MX.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Rorippa obtusa

Taxonomic and Nomenclatural Links

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General References