Elymus stebbinsii
Elymus semicostatus
Parish wheatgrass, Stebbins' wheat grass, Stebbins' wildrye
drooping wildrye
60-140 cm;
nodes glabrous or retrorsely pubescent.
45-135 cm, erect or geniculately ascending, glabrous.
glabrous or villous;
auricles to 1.5 mm;
ligules 0.5-1.5 mm, truncate;
blades 15-30 cm long, 4-12 mm wide, sometimes villous, adaxial surfaces smooth or scabrous, primary and secondary veins alternating.
evenly distributed;
sheaths glabrous or pubescent;
auricles usually present, 0.5-2 mm;
ligules 0.3-3.5 mm, truncate to acute, sometimes long-ciliate;
blades 4-6.5 mm wide, flat or the margins involute, straight.
15-31 cm long, 0.4-1.5 cm wide including the awns, 0.4-0.8 cm wide excluding the awns, erect, with 1 spikelet per node;
internodes 9-27 mm long, 1-1.3 mm wide, glabrous, smooth.
8-30 cm long, 1-2 cm wide including the awns, 0.5-1 cm wide excluding the awns, erect or nodding, usually with 1 spikelet per node, sometimes with 2 spikelets at the lower nodes;
internodes 10-20 mm long, about 0.8 mm wide, scabrous on the margins and on the surfaces, marginal prickles larger than those on the surfaces, hirtellous just below the spikelets.
13-29 mm long, from shorter than to almost twice as long as the internodes, 2.5-5 mm wide, appressed, with 5-7 florets;
rachillas glabrous;
disarticulation above the glumes and beneath each floret.
16-30 mm, loosely appressed, with 6-8 florets;
rachilla internodes about 0.8 mm, strigose, hairs to about 0.3 mm;
disarticulation above the glumes, beneath each floret.
subequal, 7.5-12 mm long, 1.2-1.5 mm wide, lanceolate, widest at about mid-length, flat or rounded on the back, 5-veined, veins smooth, scabrous or just the midvein scabridulous, margins widest at about midlength, apices acute, unawned;
lemmas 9-12 mm, glabrous, sometimes scabrous, acute, unawned or awned, awns to 28 mm, straight;
paleas subequal to the lemmas, tapering, apices 0.2-0.3 mm wide;
anthers (3.5)4-7 mm.
subequal, 10-18 mm long, 1.1-2 mm wide, elliptic-lanceolate, green, not keeled, 5-7-veined, veins more or less equally prominent, scabrous, apices acute to acuminate;
lemmas 10-14 mm, scabrous or puberulent dorsally, awned, awns (4)12-18 mm, straight;
paleas 3/4 as long as to slightly shorter than the lemmas, keels outwardly curved below the apices, apices 0.3-0.7 mm wide, truncate;
anthers 3-6 mm.
= 28.
= 28.
Elymus stebbinsii
Elymus semicostatus
Elymus stebbinsii is restricted to California, where it grows on dry slopes, chaparral, and wooded areas, at elevations below 1600 m. It differs from other Elymus species primarily in its combination of long anthers and solitary spikelets. It is often confused with E. glaucus (p. 306) and E. trachycaulus (p. 321) with solitary spikelets. It differs from both in its longer anthers, and from most representatives of E. glaucus in its acute, but unawned, glumes.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Elymus semicostatus is native to central Asia, from Afghanistan through Pakistan to northeastern India (Sikkim). Reports of its presence in the Flora region appear to be based on misidentifications.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Lemmas awned, awns 8-28 mm long; lower leaf sheaths rarely pubescent; spikelets 13-22 mm long | subsp. septentrionalis |
1. Lemmas unawned or with awns to 8(12) mm long; lower leaf sheaths pubescent or glabrous; spikelets 17-29 mm long | subsp. stebbinsii |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
Flora NW
PNW Herbaria
