Rorippa tenerrima Greene
Family: Brassicaceae
Rorippa tenerrima image
Annuals; (terrestrial or of wet habitat, not submerged); glabrous throughout. Stems (several-branched from base), prostrate to decumbent, branched distally, 0.7-3.5 (-4) dm. Basal leaves not rosulate; blade margins pinnatifid. Cauline leaves shortly petiolate, or (distal) sessile; blade oblong to oblanceolate or lanceolate, (lateral lobes linear, oblong to ovate, or obovate), 2-9(-11) cm × 7-20(-30) mm, (lateral lobes smaller than terminal), base not auriculate, margins pinnatifid, or (lateral lobes) entire, dentate, or sinuate. Racemes elongated. Fruiting pedicels ascending to divaricate, (1-)1.5-3.2(-4.2) mm, straight. Flowers: sepals ascending, oblong, 0.7-1.3 × 0.4-0.7 mm; petals yellow, oblong to oblanceolate or spatulate, 0.5-0.8 × 0.1-0.3 mm; median filaments 0.8-1.2 mm; anthers ovate, 0.1-0.2 mm. Fruits siliques or silicles, curved-ascending, lanceolate to narrowly ovoid or oblong-lanceolate, 3-7(-9) × (0.8-) 1-1.7(-2) mm (often slightly constricted at middle); valves papillate; ovules 20-80 per ovary; style (0.2-) 0.5-1 mm. Seeds biseriate, reddish brown, cordiform, 0.5-0.7 mm, colliculate. Flowering Jun-Oct. Shores of lakes and ponds, mud flats, marshes, sand bars, moist grounds, streamsides; 1300-3000 m; Alta., B.C., Sask.; Calif., Colo., Idaho, Mo., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Tex., Utah, Wash., Wyo.; Mexico (Baja California, Chihuahua).
Delicate, freely branched, glabrous or subglabrous annual; stems 1-2 dm, decumbent to prostrate, much-branched from the base; basal and cauline lvs short-petiolate, neither clasping nor auriculate, oblong to oblanceolate or spatulate, mostly 2-6 נ1-1.5 cm, usually lyrate- pinnatifid; pet ca 1 mm or less, a little shorter than the sep; mature pedicels 1.5-3.5 mm, ascending; frs cylindric, straight or incurved, sometimes constricted at the middle, mostly 3-8 נ1-1.5 mm; seeds ca 20-70. Wet, disturbed places; widely scattered in w. U.S. and adj. Can. and Mex., e. occasionally to St. Louis. (R. obtusa, misapplied; R. truncata)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
Rorippa tenerrima image
. Eastern Nevada Landscape Coalition  
Rorippa tenerrima image
Rorippa tenerrima image