[Bittercress: The Genus Cardamine East of the Cascade Mts. of Oregon and Washington]

Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress

Cardamine cordifolia var. lyallii

Synonym: Cardamine lyallii

Inflorescence of Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii

Close-up of the inflorescence of large mountain bittercress as seen in Upper Naneum Meadows, Wenatchee National Forest......July 24, 2009.

Heart-shaped leaf of Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyalliiThe photo at right shows the leaf of large mountain bittercress as seen in Upper Naneum Meadows, Wenatchee National Forest.......July 24, 2009.
Characteristics:

Large mountain bittercress is a perennial wildflower of wet places. It is erect in habit with stems from 20-50 cm high arising from slender rhizomes from 2-2.5 mm thick. The lower stems range from glabrous to fairly densely haired with short, spreading and simple hairs. The long-petioled, simple, basal leaves are orbicular to ovate shape. They measure 3-7 cm long and 3-7 cm wide with heart-shaped bases and shallow lobed margins. The petioles are typically 2-5 times longer than the blades. The more numerous stem leaves are similar to those at the base but have slightly shorter petioles. The surfaces of all the leaves are glabrous to sparsely haired.

The inflorescence is a few-flowered raceme of white flowers. The spreading to ascending pedicels are 10-20 mm long and the glabrous sepals measure 3-4 mm long. The petals are spatulate-obovate in shape and measure 7-12 mm long. The stamens are slightly longer than the sepals. The fruits are straight, ascending siliques from 2-3.5 cm long and 1.5-4 mm wide.


Habitat:

Large mountain bittercress is a plant of wet places at middle elevations including seeps and streams and moist alpine meadows.


Range:

Large mountain bittercress may be found across much of the western United States and Canada.


Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii -- Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii

Large mountain bittercress as seen in a small stream in Upper Naneum Meadows, Wenatchee National Forest........July 24, 2009.

Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii) - Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii)

Large mountain bittercress blooming enmasse at a spring along Reecer Creek Road, Wenatchee National Forest........July 6, 2012.

Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii)

Large mountain bittercress as seen in small streams that cross the North Fork Catherine Creek Trail #1905, Eagle Cap Wilderness.......June 12, 2018.

Leaves of Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii) - Maturing fruits of Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii)

Large mountain bittercress with maturing fruits as seen at a creek crossing along the Lick Creek Trail #231, Hells Canyon National Recreation Area.......August 11, 2018.

Basal leaves of Heart-leaved Bittercress, Large Mountain Bittercress, Lyall's Bittercress: Cardamine cordifolia var. lyallii (Synonym: Cardamine lyallii)

Basal leaves of large mountain bittercress as seen along a stream crossing Forest Service Road #3521, Wenatchee National Forest........July 8, 2012.

Paul Slichter