[The Genus Lotus in the Columbia River
Gorge of Oregon and Washington]
Bog Deervetch, Meadow Bird's-foot Trefoil, Meadow Deervetch
Synonyms: Hosackia pinnata, Lotus bicolor
Meadow bird's-foot trefoil growing in a small stream in the Klickitat State Wildlife Area of south-central Washington.........June 12, 2009.
at right illustrates bog deer-vetch from Fisher Hill Rd.......June 30, 1991.
Bog deer-vetch is a perennial wildflower with many erect to
spreading stems from 15-60 cm long. The leaves are pinnately compound with 5-9
elliptic, oblong or obovate leaflets, each 1-2 cm long. The leaves are 4-8 cm
The flower heads are 3-to 12-flowered umbels. The flowers range
from 10-15 mm long with yellow banner and keel and white wings. The calyx is
tubular and 4-8 mm long with triangular-lanceolate teeth from 1/5-1/3 as long
as the tube. The upper two calyx lobes are joined most of their length and are
merely notched between them. The seed pods range from 3-6 mm in length and 1.5-2
mm wide with 8-20 seeds.
Bog deer-vetch is found growing in the slow moving water of
streams that dry up by mid-summer.
Bog deer-vetch may be found from northwestern Washington south
to central California and east along streams and lakes to Idaho.
In the Columbia River Gorge, it may be found between the elevations
of 200'-2000' from Cape Horn east to the Klickitat River.
Several groups of inflorescence of bog deervetch as seen in wetlands on private lands at Panakanic, western Klickitat County, WA..........June 8, 2014.
Bog deervetch from vernally moist swales at Panacanic in western Klickitat County..........June 17, 2013.
Bog deervetch early in its bloom along a creek at Brooks Memorial State Park..........May 19, 2014.
Bog deervetch blooming in Little Bowman Creek at the trailhead for Canyon Creek, Klickitat Wildlife Area.........May 22, 2015.
Inflorescence of bog deer-vetch from small creek across Fisher hill Rd (past summit).....June