Brachyelytrum aristosum

(Michx.) R Beauv. ex Branner & Coville
Common names: Northern shorthusk
Synonyms: Brachyelytrum septentrionale Brachyelytrum erectum var. septentrionale Brachyelytrum aristatum
Treatment appears in FNA Volume 24. Treatment on page 60.

Culms (28) 41-78 (96) cm long, 0.6-1 mm thick; nodes densely pilose; internodes glabrous or hispid, occasionally retrorsely pubescent near the nodes. Sheaths pubescent; ligules of middle and upper cauline blades 1.8-2.5 mm, acute, erose; blades (6.9) 8.6-13 (16.1) cm long, 8-16 mm wide, abaxial surfaces sparsely pilose, adaxial surfaces with some hairs usually restricted to the veins, margins scabrous, with (1) 4-10 (12) prickles and (1) 1-9 macrohairs per mm. Panicles (6.6) 9.5-17.5 cm. Spikelets, including the awns, 23-36 mm. Lower glumes 0.1-0.4 (0.9) mm, sometimes absent; upper glumes 0.6-1.7 (3) mm; calluses hairy, hairs 0.2-0.5 mm; lemmas 8-10 (11) mm long, 0.7-1.4 mm wide, veins scabridulous, scabrules 0.08-0.14 (0.2) mm, all veins equally prominent; awns (14) 17-24 (26) mm; paleas 7.7-11.5 mm; anthers 2-3.5 mm. Caryopses 5.5-7.5 mm. 2n = 22.

Distribution

Maine, Va., Mass., N.Y., N.C., N.J., Wis., W.Va., Mich., Minn., N.H., Vt., Tenn., R.I., Pa., Ga., Ind., Iowa, Conn., N.B., Nfld. and Labr. (Labr.), N.S., Ont., P.E.I., Que.

Discussion

Brachyelytrum aristosum, like B. erectum, grows in moist woods and forests, but its primary distribution is more northern, extending from Ontario to Newfoundland, Minnesota, and Pennsylvania, and south through the Appalachian Mountains to the junction of Tennessee, North Carolina, and Georgia.

Some authors (e.g., Koyama and Kawano 1964) have called this taxon Brachyelytrum erectum var. glabratum.

As discussed under B. erectum, that name is a nomenclatural synonym of B. erectum sensu stricto. Nevertheless, most plants identified as B. erectum var. glabratum will be found to be B. aristosum.

Selected References

None.

Lower Taxa

None.
... more about "Brachyelytrum aristosum"
membranous +  and scarious +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Stephen N. Stephenson +  and Jeffery M. Saarela +
(Michx.) R Beauv. ex Branner & Coville +
1 (?) +  and 3 (?) +
14 cm140 mm <br />0.14 m <br /> (?) +
straight +
basal +  and apical +
1.7 cm17 mm <br />0.017 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
8.6 cm86 mm <br />0.086 m <br /> (13 cm130 mm <br />0.13 m <br />) +
not evident +
cross +  and tapering +
8mm;16mm +
spikelike +
0.8 cm8 mm <br />0.008 m <br /> (?) +
Northern shorthusk +
not branched +
41 cm410 mm <br />0.41 m <br /> (78 cm780 mm <br />0.78 m <br />) +
28 cm280 mm <br />0.28 m <br /> (102 cm1,020 mm <br />1.02 m <br />) +
woody +  and herbaceous +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Maine +, Va. +, Mass. +, N.Y. +, N.C. +, N.J. +, Wis. +, W.Va. +, Mich. +, Minn. +, N.H. +, Vt. +, Tenn. +, R.I. +, Pa. +, Ga. +, Ind. +, Iowa +, Conn. +, N.B. +, Nfld. and Labr. (Labr.) +, N.S. +, Ont. +, P.E.I. +  and Que. +
0 +  and 1/2 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
compressed +
8mm +  and 12mm +
subtending +
2 +  and 1 +
lanceolate +
unequal +
uncinate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
pubescent +, hispid +  and glabrous +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
tapering +
membranous +  and coriaceous +
0.7mm +  and 1.4mm +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
subequal +
0.77 cm7.7 mm <br />0.0077 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
6.6 cm66 mm <br />0.066 m <br /> (?) +
9.5 cm95 mm <br />0.095 m <br /> (17.5 cm175 mm <br />0.175 m <br />) +
dry +  and fleshy +
unisexual +  and bisexual +
terete +  and dorsally compressed +
2.3 cm23 mm <br />0.023 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
persistent +
elongate +
Brachyelytrum septentrionale +, Brachyelytrum erectum var. septentrionale +  and Brachyelytrum aristatum +
Brachyelytrum aristosum +
Brachyelytrum +
species +
membranous +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
scabridulous +
0.008 cm0.08 mm <br />8.0e-5 m <br /> (0.014 cm0.14 mm <br />1.4e-4 m <br />) +
aquatic +  and terrestrial +