[The Genus Lotus in the Columbia River Gorge of Oregon and Washington]

Big Deervetch, Thick-leaf Deer-vetch

Lotus crassifolius var. crassifolius

Synonyms: Hosackia crassifolia var. crassifolia, Lotus crassifolius

Inflorescence of Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonyms: Hosackia crassifolia var. crassifolia, Lotus crassifolius)

Big deer-vetch as seen from Little Bowman Creek, Klickitat Wildlife Area, Klickitat County, Washington........May 30, 2015.


Flowers of Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonym: Hosackia crassifolia)Photo at right illustrates thicket deer-vetch (var. crassifolius) from FS Rd# 3870, Fremont NF.......July 18, 1998.
Characteristics:

Thicket deer-vetch is a perennial wildflower with many erect to spreading stems from 20-100 cm long. The herbage is mostly glabrous or smooth, with some sparse hairs occasionally found above. The leaves are pinnately compound with 9-15 oblong to oblong-obovate leaflets, each 1-3 cm long. The leaflets are bright green above and paler below.

The flower heads are 7-20 flowered umbels with the umbels arising on long pedicels from the leaf axils. The flowers range from 8-13 mm long and range from greenish-yellow to whitish with purple or reddish-purple markings. The calyx is 4-5 mm long with triangular-lanceolate teeth about 1/4 the length of the tube. The long, narrow pods contain 4-10 seeds.


Varieties:

Variety crassifolius: The corolla of this variety is whitish tinged with red or purple.

Variety subglaber: The corolla of this variety is a greenish-yellow with deep purple spots.


Habitat:

Thicket deer-vetch is found growing in moist open woods, along streams, or in forest clearings.


Stem leaves of Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonym: Hosackia crassifolia)

The photo above illustrates the pinnately compound leaf thicket deer-vetch (var. crassifolius) as seen southeast of Roseburg, OR.........late June 2005.

Range:

Thicket deer-vetch may be found from northwestern Washington south to southern California from the eastern slopes of the Cascades west to the Pacific coast.

Variety crassifolius may be found from southwestern Washington and east in the Columbia River Gorge to Wasco County, OR, and hence south along the eastern Cascade foothills to southern California.

In the Columbia River Gorge, it may be found between the elevations of 100'-2000' from the Little White Salmon River east to Hood River Mt. Meadows.


Inflorescence and stem leaves of Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonym: Hosackia crassifolia)

Lotus crassifolius var. crassifolius as seen from the western Cascade Mts southeast of Roseburg, OR........late June 2005.


Pods of Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonym: Hosackia crassifolia)

Photo above illustrates the seed pods of thicket deer-vetch (var. crassifolius) from FS Rd# 3870, Fremont NF.......July 18, 1998.

Big Deervetch, Thick-leaf Deer-vetch: Lotus crassifolius var. crassifolius (Synonym: Hosackia crassifolia)


Paul Slichter