Calamagrostis ophitidis

(J.T. Howell) Nygren
Common names: Serpentine reedgrass
Endemic
Synonyms: Calamagrostis purpurascens var. ophitidis
Treatment appears in FNA Volume 24. Treatment on page 712.

Plants usually with sterile culms; usually cespitose, often with rhizomes 2-15 cm long, 1-3 mm thick. Culms (30) 55-80 (100) cm, unbranched, scabrous beneath the panicles; nodes (1) 2 (5). Sheaths and collars usually scabrous, rarely smooth; ligules (0.5) 2-5.5 (7) mm, usually truncate, entire to slightly lacerate; blades (8) 10-20 (27) cm long, (1.5) 2-3 (4) mm wide, usually involute, abaxial surfaces usually scabrous, rarely smooth, adaxial surfaces scabrous, glabrous or sparsely hairy, both surfaces with abundant white glands between the veins, visible only with magnification. Panicles (6) 8-11 (15) cm long, (1) 1.2-1.5 cm wide, contracted, mostly erect, pale green to green; branches 2-4 (4.5) cm, scabridulous, usually spikelet-bearing to the base. Spikelets (4.5) 5-7 (8) mm; rachilla prolongations about 1.5 mm, hairs 1-2 mm. Glumes keeled, usually scabrous over the entire surface, rarely only the keels scabrous distally, lateral-veins prominent, apices acute to acuminate; callus hairs 1-1.5 (2) mm, 0.2-0.4 times as long as the lemmas, sparse; lemmas 4.5-6.5 mm, 0-2 mm shorter than the glumes; awns 5-6 (8) mm, attached to the lower 1/10 – 1/5 of the lemmas, exserted less than 2 mm, stout, distinguishable from the callus hairs, bent; anthers (2.5) 3-3.5 (4) mm. 2n = 28.

Discussion

Calamagrostis ophitidis grows in meadows, seeps, grasslands, and chaparral, as well as in coniferous forests, on serpentine outcrops and soils, at 50-1100 m. It is known only from Sonoma, Marin, Mendocino, Lake, and Napa counties in California.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Calamagrostis ophitidis"
membranous +  and scarious +
hairy +, glabrous +  and scabrous +
2.5 cm25 mm <br />0.025 m <br /> (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Acute (?) +  and Acuminate (?) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
(J.T. Howell) Nygren +
1 (?) +  and 3 (?) +
8 cm80 mm <br />0.08 m <br /> (?) +
straight +
attached +
exserted +  and lower +
distinguishable +
1/10 +  and 1/5 +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
not evident +
flat +  and involute +
2mm;3mm +
4.5 cm45 mm <br />0.045 m <br /> (?) +
appressed;more or less drooping +
scabridulous +
spikelike +
0.2-0.4 times as long as the lemmas +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Serpentine reedgrass +
ascending +  and erect +
55 cm550 mm <br />0.55 m <br /> (80 cm800 mm <br />0.8 m <br />) +
not woody +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
subtending +
subequal +
membranous +
sparse +  and abundant +
uncinate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
lanceolate +  and ovate +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
entire +  and slightly lacerate +
0.2 cm2 mm <br />0.002 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
membranous +
inconspicuous +
lanceolate +
5 (?) +  and 1 (?) +
concealed +  and prominent +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
pale green +  and green +
8cm +  and 11cm +
spikelike +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Calamagrostis purpurascens var. ophitidis +
Calamagrostis ophitidis +
Calamagrostis +
species +
membranous +
parallel +  and converging +
obscure +  and prominent +
plant +  and cespitose +
aquatic +  and terrestrial +