Elymus stebbinsii
Elymus diversiglumis
Parish wheatgrass, Stebbins' wheat grass, Stebbins' wildrye
diverseglume wildrye, unequal-glumed wildrye
60-140 cm;
nodes glabrous or retrorsely pubescent.
70-160 cm, erect;
nodes 4-9, mostly exposed, glabrous.
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.
evenly distributed;
sheaths glabrous, often purplish;
auricles 1-2 mm, purplish or brownish black;
ligules usually 1-2 mm;
blades 5-17 mm wide, lax, adaxial surfaces usually pilose, at least on the veins, occasionally scabrous.
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.
8-28 cm long, 3-5 cm wide, nodding to pendent, with 2 spikelets per node, rarely with 1 or 3 at a few nodes;
internodes 4-6(9) mm long, 0.2-0.3 mm thick at the thinnest sections, margins and summits often pubescent.
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.
10-16 mm, appressed, with 2-4(5) florets, lowest florets functional;
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.
usually differing in length by at least (3)4 mm, occasionally obsolete, (1)2-15(20) mm long including the undifferentiated awns, indurate at the base, (0.1)0.2-0.4(0.6) mm wide, setaceous, 0-1-veined, tapering from the base, scabrous or hispidulous at least towards the apices, margins firm, awns often outcurving;
lemmas 7-12 mm, usually silvery-hirsute to sericeous, occasionally hirtellous or strigose, at least near the margins, backs sometimes scabrous, awns 18-35 mm, moderately to strongly outcurving at maturity;
paleas 7-10 mm, obtuse, occasionally emarginate;
anthers 2-4 mm.
from early June to late July.
= 28.
= 28.
Elymus stebbinsii
Elymus diversiglumis
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 diversiglumis grows in moist to dry, often base-rich and alluvial soils, in open woods, woodland margins, and thickets in the northern Great Plains, from Saskatchewan and Manitoba to Wyoming, Wisconsin, and Iowa.
Elymus diversiglumis is a variable species that, like E. svensonii (p. 314) and E. churchii (p. 314), may have originated from hybrids between E. canadensis var. canadensis (p. 305) and E. hystrix (see next), although part of its range extends further west than the current distribution of the latter species. Elymus diversiglumis usually reaches anthesis 2-4 weeks earlier than sympatric populations of E. canadensis. Church (1954, 1958, 1967a) found that most artificial canadensis-hystrix hybrids, as well as some plants of E. diversiglumis itself, are sterile. Those that were not sterile could occasionally form fertile backcrosses with E. canadensis and, to a lesser extent, with E. hystrix. Introgressant populations involving all three species are known. Artificial crosses with other species have not been successful.
(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
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