Elymus texensis

J.J.N. Campb.
Common names: Texan wildrye
Treatment appears in FNA Volume 24. Treatment on page 312.

Plants cespitose, not rhizomatous, glaucous. Culms 70-110 cm, erect; nodes 4-6, mostly exposed, glabrous. Leaves even¬ly distributed; sheaths glabrous or ciliate; auricles to about 2 mm, pale to purplish brown; ligules 1-2 mm, erose; blades 2-9 mm wide, lax or somewhat involute, adaxial surfaces thinly scabrous to hirsute or densely pilose. Spikes 9-20 cm long, 2-2.5 cm wide, erect to slightly nodding, with 2 spikelets per node; internodes (5) 7-15 (22) mm long, 0.1-0.3 mm thick at the thinnest sections, glabrous except for the ciliolate margins, with slight dorsal angles and green lateral bands along the concave sides. Spikelets 13-20 mm excluding the awns, 20-40 mm including the awns, appressed, with 4-6 (8) florets, lowest florets functional; disarticulation above the glumes, beneath each floret. Glumes subequal, 14-24 mm long including the undifferentiated awns, 0.1-0.3 mm wide, setaceous, entire, 0-1-veined, tapering from the base, glabrous, margins firm, awns more or less straight; lemmas 8-12 mm, smooth, glabrous, awns 8-25 mm, straight, flexuous or slightly curving; paleas 7-11 mm, obtuse or truncate; anthers 4.5-6 mm. Anthesis in May. 2n = unknown.

Discussion

Elymus texensis is known only from calcareous bluffs and hills in juniper woods and grassy areas on the Edwards Plateau of southwest Texas. It is known from only three collections and needs further study (Campbell 2002). It is similar to the Mexican species E. pringlei (see previous), but differs in its larger anthers, larger, less pubescent spikelets, and in its longer, glabrous rachis internodes with green lateral bands.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Elymus texensis"
membranous +  and scarious +
thinly scabrous +  and hirsute or densely pilose +
with hairs +  and scabrous +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
bidentate +  and acute +
pale +  and purplish brown +
Mary E. Barkworth +, Julian J.N. Campbell +  and Bjorn Salomon +
J.J.N. Campb. +
1 (?) +  and 3 (?) +
curving +, flexuous +  and straight +
basal +  and apical +
from the sinus +  and terminal +
undifferentiated +
not geniculate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
cross +, linear +  and narrowly lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hairy +  and glabrous +
Texan wildrye +
not branching +
sometimes strongly decumbent +  and prostrate +
70 cm700 mm <br />0.7 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
not woody +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
4 +  and 6 +
laterally compressed +  and terete +
shorter than to longer than the adjacent florets +
14mm +  and 24mm +
subtending +
tapering +  and setaceous +
subequal +
0.1mm +  and 0.3mm +
uncinate +
solid +  and hollow +
1.5 cm15 mm <br />0.015 m <br /> (?) +
7mm +  and 15mm +
0.2 cm2 mm <br />0.002 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
ciliate +  and scabrous +
distributed +
linear-lanceolate +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
stiffly membranous +  and coriaceous +
erose +  and entire +
acute +, rounded +  and truncate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
4 +  and 6 +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
slightly longer +
truncate +  and obtuse +
subequal +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
dry +  and fleshy +
spikelike +
ciliate +  and glabrous +
concave +
9 cm90 mm <br />0.09 m <br /> (?) +  and 20 cm200 mm <br />0.2 m <br /> (?) +
subsessile +  and sessile +
bisexual +  and sterile +
terete +  and compressed +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
not papillate +
Gramineae +
Elymus texensis +
species +
membranous +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
inconspicuous +
unequal +
plant +  and cespitose +
aquatic +  and terrestrial +