Pleuropogon refractus

(A. Gray) Benth. ex Vasey
Common names: Nodding semaphoregrass
Endemic
Treatment appears in FNA Volume 24.

Plants perennial; not cespitose, rhizomatous. Culms (85) 100-150 cm, erect. Sheaths glabrous or pubescent, sometimes scabrid¬ulous; ligules 2-7 mm; blades 10-40 cm long, 5-14 mm wide, apices acute or acuminate and sharply mucronate, flag leaves often reduced to spinose tips. Racemes (10) 20-35 cm, with 6-14 spikelets; internodes 2-5.6 (8) cm; pedicels 2-3 mm long, reflexed at maturity. Spikelets (20) 25-28 mm, pendent, with 7-14 florets, usually all but the terminal floret bisexual. Glumes frequently scabrous, apices obtuse, sometimes erosely notched; lower glumes 3-6 mm; upper glumes 4-7 (8.3) mm, 3-veined; rachilla internodes 2-3 mm long, about 0.1 mm thick, bases sometimes weakly differentiated into a glandular swelling; lemmas 8-10 mm, faintly 7 (9) -veined, lateral-veins occasionally prominent, apices truncate, sometimes toothed, awned, awns (5) 9-20 mm; paleal keels each with a 0.2-0.6 (1) mm triangular appendage; anthers 3.5-4 mm. Caryopses 4.5-6 mm. 2n =32, 36.

Distribution

Calif., Oreg., Wash., B.C.

Discussion

Pleuropogon refractus grows in wet meadows, riverbanks, and shady places, from sea level to about 1000 m. Its range extends from British Columbia south to California.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Pleuropogon refractus"
membranous +  and scarious +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
awned +  and truncate +
Toothed (?) +, Notched (?) +, Obtuse (?) +, Mucronate (?) +, Acuminate (?) +  and Acute (?) +
scarious +
Paul P.H. But +
(A. Gray) Benth. ex Vasey +
1 (?) +  and 3 (?) +
5 cm50 mm <br />0.05 m <br /> (?) +
straight +
basal +  and apical +
0.9 cm9 mm <br />0.009 m <br /> (2 cm20 mm <br />0.02 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
persistent +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
flat +  and folded +
5mm;14mm +
Nodding semaphoregrass +
extravaginal +  and basal +
geniculate +
100 cm1,000 mm <br />1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Calif. +, Oreg. +, Wash. +  and B.C. +
0 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
sometimes longer +
7 +  and 14 +
compressed +
reduced +
subtending +
unequal +  and subequal +
membranous +
uncinate +
8 cm80 mm <br />0.08 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (5.6 cm56 mm <br />0.056 m <br />) +
reduced +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
herbaceous +  and membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
membranous +
inconspicuous +
lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
extended +
concealed +  and prominent +
2 +  and 1 +
well-developed +
subequal +
dry +  and fleshy +
20 cm200 mm <br />0.2 m <br /> (35 cm350 mm <br />0.35 m <br />) +
pubescent +  and glabrous +
6 +  and 14 +
not viviparous +
compressed +
2.5 cm25 mm <br />0.025 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Pleuropogon refractus +
Pleuropogon +
species +
membranous +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
plant +  and not cespitose +
aquatic +  and terrestrial +
10 +, 9 +  and 8 +