Calamagrostis muiriana

B.L. Wilson & Sami Gray
Common names: Mum's reedgrass
Treatment appears in FNA Volume 24. Treatment on page 717.

Plants sometimes with sterile culms; densely cespitose, often with rhizomes 1-3 cm long, 1-2 mm thick. Culms (10) 12-35 cm, unbranched, smooth beneath the panicles; nodes 1-3. Leaves basally concentrated; sheaths and collars smooth or scabrous; ligules 1-2.5 mm, obtuse, entire to lacerate; blades (1) 4-12 cm long, 0.2-0.4 mm in diameter, involute, abaxial surfaces scabrous, adaxial surfaces sparsely hairy. Panicles (1.5) 1.9-5.7 (7.5) cm long, 0.4-3 cm wide, contracted to open, usually dark purple, rarely straw-colored; branches (0.8) 1.1-2 (3.5) cm, smooth, spikelets usually confined to the ends of the branches. Spikelets (3) 3.5-4.5 (5) mm; rachilla prolongations about 2 mm, hairs 0.5-1 mm. Glumes rounded, midvein smooth or slightly scabrous, lateral-veins obscure, apices acute to acuminate, rarely awn-tipped; callus hairs (0.2) 0.3-0.6 mm, 0.1-0.2 times as long as the lemmas, sparse; lemmas (2.5) 3-4 mm, 0.5-1 mm shorter than the glumes; awns 3.5-6 mm, attached to the lower 1/3 of the lemmas, exserted, bent, purple; anthers 0.9-2.5 mm. 2n = 28.

Discussion

Calamagrostis muiriana grows in moist to dry, subalpine and alpine floodplain meadows, lake margins, and stream banks, at 2400-3900 m, in the Sierra Nevadas south of Sonora Pass in central California. It differs from C. bolanderi (p. 719) in having basally concentrated leaves.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Calamagrostis muiriana"
membranous +  and scarious +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Acute (?) +  and Acuminate (?) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
B.L. Wilson & Sami Gray +
1 (?) +  and 3 (?) +
straight +
attached +
exserted +  and lower +
indistinct +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
not evident +
flat +  and involute +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (?) +
appressed;more or less drooping +
spikelike +
0.1-0.2 times as long as the lemmas +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Mum's reedgrass +
ascending +  and erect +
12 cm120 mm <br />0.12 m <br /> (35 cm350 mm <br />0.35 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 +
rounded +
subequal +
membranous +
sparse +  and abundant +
uncinate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
lanceolate +  and ovate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
entire +  and lacerate +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
1 +  and 3 +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
straw-colored +  and dark purple +
1.9cm +  and 5.7cm +
spikelike +
0.4 cm4 mm <br />0.004 m <br /> (3 cm30 mm <br />0.03 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Calamagrostis muiriana +
Calamagrostis +
species +
membranous +
parallel +  and converging +
obscure +  and prominent +
plant +  and cespitose +
aquatic +  and terrestrial +