Calamagrostis perplexa

Scribn.
Common names: Wood reedgrass
Endemic
Synonyms: Calamagrostis porteri subsp. perplexa
Treatment appears in FNA Volume 24. Treatment on page 726.

Plants with sterile culms; weakly cespitose, with rhizomes 8+ cm long, 1.5-2 mm thick. Culms (80) 85-110 (120) cm, sometimes branched, smooth or slightly scabrous beneath the panicles; nodes 4-6. Sheaths smooth; collars densely hairy; ligules (3) 4-6 (7) mm, lacerate; blades (10) 15-30 (35) cm long, (3) 4.5-6.5 (7) mm wide, flat, scabridulous, adaxial surfaces glabrous or sparsely hairy. Panicles 10-18 (20) cm long, (1) 2-3 cm wide, open, erect to nodding, green, purple-tinged; branches 5-6.5 cm, spikelets usually confined to the distal 1/4-1/2. Spikelets (3) 3.5-4 mm; rachilla prolongations about 1 mm, hairs about 2 mm. Glumes keeled, scabrous on the keels, lateral-veins usually prominent, apices acuminate; callus hairs 2-3 mm, 0.7-1 times as long as the lemmas, somewhat sparse; lemmas 3-3.5 mm, 0.5-1 mm shorter than the glumes; awns 2-3 mm, attached to the lower 1/4-1/3 of the lemmas, not exserted, stout, distinguishable from the callus hairs, bent; anthers 1-1.5 mm. 2n = 70.

Discussion

Calamagrostis perplexa grows on wet rocks and in dry woods at "Thatcher's Pinnacle" [Pinnacle Rock], Tompkins County, New York. There is also an unverified report of this species in Columbia County, New York. This apparently sterile species is intermediate between C. porteri (p. 721) and C. canadensis (see next) (Greene 1980). It is of conservation concern because of its limited distribution.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Calamagrostis perplexa"
membranous +  and scarious +
hairy +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
Scribn. +
1 (?) +  and 3 (?) +
straight +
attached +
not exserted +  and lower +
distinguishable +
1/4 +  and 1/3 +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not evident +
scabridulous +
flat +  and involute +
4.5mm;6.5mm +
appressed;more or less drooping +
spikelike +
0.7-1 times as long as the lemmas +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Wood reedgrass +
ascending +  and erect +
85 cm850 mm <br />0.85 m <br /> (110 cm1,100 mm <br />1.1 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 +
2 cm20 mm <br />0.02 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 />) +
lacerate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
4 +  and 6 +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
purple-tinged +  and green +
10cm +  and 18cm +
erect +  and nodding +
spikelike +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
dry +  and fleshy +
1/4 +  and 1/2 +
compressed +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Calamagrostis porteri subsp. perplexa +
Calamagrostis perplexa +
Calamagrostis +
species +
membranous +
parallel +  and converging +
obscure +  and prominent +
plant +  and cespitose +
aquatic +  and terrestrial +
1.5mm +  and 2mm +