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Montana Field Guide

Montana Field Guides

Yellowcress - Rorippa alpina
Other Names:  Rorippa curvipes var. alpina

Native Species

Global Rank: G4?
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Perennial from wet areas, usually glabrous. Basal leaves: petioles mostly 1-2 cm long, blade mostly 1-3.5 cm long, margins usually dentate to pinnatifid, rareply repand. Stem leaves petiolate or subsessile, blade obovate to oblanceolate, smaller distally, margins entire, crenate or repand. Fruiting pedicels asceonding to slightly reflexed, straight or curved, mostly 3-6 mm long. Fruits siliques or sometimes silicles, straight or slightly curved, mostly 3-7 x 1.5-2.5 mm, valves glabrous; ovules up to 46 per ovary; style mostly 0.5-1 mm long. Seeds biseriate, yellow-brown, 0.5-0.7 mm (adapted from Al-Shehbaz, 2007, in Flora N. America, Vol. 7).

Lesica (2012) treats this as a variety of R. curvipes.

Species Range

Range Comments
ID, WY and MT south to CO and NV (Al-Shehbaz, 2007, in Flora N. Amer., Vol. 7).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist areas, including streamsides, ponds, seeps, 1400-3800 meters (Al-Shehbaz, 2007, in Flora N. Amer., Vol. 7).

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Citation for data on this website:
Yellowcress — Rorippa alpina.  Montana Field Guide.  .  Retrieved on , from