Brachyelytrum aristosum

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

References

None.

Lower Taxa

No lower taxa listed.