Spear-leaf Agoseris, Spear-leaved Agoseris
Synonym: Macrorhynchus retrorsus
The photo above shows spear-leaf agoseris
? as seen at a DNR rock quarry at about 4100' abreast the ridgetop between the
Dairy Creek and Cougar Creek drainages on the southeast corner of Mt. Adams...........May
photo at right shows a key identifying characteristic of spear-leaf agoseris.
The upper end of the achene or seed is squared off and the narrow beak which
is plumed (or parachute-like) at its end. Photographed at Catherine Creek,
central Columbia River Gorge..........June 3, 2006.
Spear-leaf agoseris is a perennial wildflower with one to several
erect, leafless scapes arising 15-60 cm high from a cluster of basal leaves
atop a taproot. Plants typically begin with a covering of soft, shaggy, tangled
hairs but eventually become glabrous with age, especially above. The leaves
measure 8-20 cm long and are narrowly oblong, lanceolate or elliptical in
outline and gradually tapering to a narrow tip at both ends. The margins are
deeply lobed with the lobes generally long and linear with the lower ones
spreading and the upper ones directed backwards.
A single flower head consisting entirely of ray flowers may
be found atop each scape. The heads tend to be narrower than those found in
the similar large-flowered agoseris. The involucre
ranges from 2.5-5 cm long in fruit. The outer involucral bracts are shorter
and lance-oblong in outline while the inner bracts are longer and broad below
tapering gradually to the long linear upper portion. The rays are typically
yellow, although they often dry to a pinkish color. The achenes are cylindrical,
measure 5-6 mm long, and are truncate at the apex, with the beak about 3-4
times longer than the body of the achene.
Spear-leaf agoseris may typically be found in
dry, open woods.
Spear-leaf agoseris may be found along the eastern
edge of the Cascade Mts. from Chelan County in Washington south to California
and Nevada and east through Oregon and Washington to southwestern Idaho.
In the Columbia River Gorge, it may be found
between the elevations of 400'-2500' from the White Salmon River east to near
the Klickitat River.
Spear-leaf agoseris spotted in bloom in open oak forest on slopes above the Klickitat River near Klickitat, WA.....April 29, 2021.
The 2 photos directly above show close-ups of a basal leaf of
this species. Note the numerous long hairs towards the lower half of the leaf
as well as the deeply divided leaf with the lobes pointing outwards or slightly
downwards towards the base of the leaf. Photographed at
Catherine Creek, central Columbia River Gorge..........June
Spear-leaf agoseris as seen at left on the southeastern slopes of Mt.
Adams..........2005. The photo at right shows the spear-like basal leaves of spear-leaf agoseris as seen at Catherine Creek......February 18, 2020.
The photo above shows the involucral bracts of spear-leaf agoseris
as seen after flowering has occurred. Note that the bracts are of different
lengths and overlap like shingles. Photographed at Catherine Creek, central
Columbia River Gorge.........June 3, 2006.
Basal leaf rosette of spear-leaf agoseris as seen under ponderosa pines just uphill from the basalt arch at Catherine Creek, Columbia River Gorge..........January 31, 2015.