164 GRAMINEAE. 
3. Calamagrostis Langsdorfii (Link) Trin. Langsdorf’s Reed-grass. 
(Fig. 374.) 
Arundo Langsdorfit Link, Enum. 1:74.  182r1. 
Calamagrostis Langsdorfit Trin. Unifl. 225. pl. 4. f. 10. 
1824. 
Culms 2°-4° tall, erect, simple, smooth or roughish. 
Sheaths shorter than the internodes; ligule 1//-3// 
long; leaves 4/-12’ long, 2’’-4’’ wide, scabrous; pan- 
icle 2’-6/ in length, the branches ascending or some- 
times erect, the lower 1/—-2’ long, naked at the base; 
spikelets 2’/-3’ long, the outer scales acuminate, 
strongly scabrous; third scale equalling or shorter 
than the second, scabrous, the stout awn as long as or 
a little exceeding the copious basal hairs which are 
usually somewhat shorter than the scale. 
Newfoundland to Alaska, south to the mountains of 
New England and New York, and to Manitoba and Wash- 
ington. Also in northern Europe and Asia. Summer. 
1862. 
Culms 2°-4° tall, erect, simple, smooth and glabrous. 
Sheaths shorter than the internodes, slightly scabrous, 
with a villous ring at the summit; ligule 1’’/-2’’ long; 
leaves 6/-12’ long, 2’/-4’’ wide, rough; panicle 4’—8’ 
in length, the branches erect, the lower 1/-2/ long; 
spikelets 1/’-214’’ long, the outer scales strongly sca- 
brous, acute; third scale shorter than or equalling the 
second, obtuse, scabrous, the lateral basal hairs about 
one-third the length of the scale, those at the back 
short or wanting; awn bent, about equalling the scale, 
the lower part twisted. 
In dry woods, Pennsylvania and southern New York. 
Aug.—Sept. 
5. Calamagrostis breviséta (A. Gray) Scribn. Pickering’s Reed-grass. 
(Fig. 376.) 
Calamagrostis sylvatica var. breviseta A. Gray, Man. 
582. 1848. 
Calamagrostis Pickeringii A. Gray, Man. Ed. 2, 547. 
1856. 
Calamagrostis breviseta Scribn. Mem. Torr. Club, 5: 
41. 1894. 
Culms 12/-18/ tall, erect, rigid, simple, scabrous 
below the panicle. Sheaths smooth and glabrous, 
the lower overlapping, the upper one elongated; lig- 
ule 1/7-3’ long; leaves 114’—4’ long, 2’’ wide, erect, 
smooth beneath, rough above; panicle 3/-414’ in 
length, the branches ascending or erect, the lower 
1/-114/ long; spikelets 13’’-2’’ long, purple tinged, 
the outer scales acute, scabrous on the keel; third 
scale shorter than the second, obtuse, scabrous, the 
basal hairs very short; awn bent, not twisted, 
equalling or slightly exceeding the scale. 
In wet places, Cape Breton Island to New Hamp- 
shire and Massachusetts. Occurs in the alpine region 
of the White Mountains. Aug.—Sept. 
