164 



GRAMINEAE. 



3. Calamagrostis Langsdorfii (L,ink) Trin. I^angsdorf's Reed-grass. 



(Fig. 374.) 



Arundo Langsdorfii Link, Enum. i: 74. 1821. 

 Calamagrostis Langsdorfii Trin. Unifl. 225. pi. 4. f. 10. 

 1824. ' 



Culms 2-4 tall, erect, simple, smooth or roughish. 

 Sheaths shorter than the internodes; ligule i // -3 // 

 long; leaves 4 / -i2 / long, 2 // -4 // wide, scabrous; pan- 

 icle 2 / -6 / in length, the branches ascending or some- 

 times erect, the lower i / -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. 



4. Calamagrostis Ported A. Gray. Porter's Reed-grass. (Fig. 375.) 



Calamagroslis Porleri A. Gray, Proc. Am. Acad. 6: 79. 

 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 i // -2 // long; 

 leaves 6 / -i2 / long, 2 // -4 // wide, rough; panicle 4 / -8 / 

 in length, the branches erect, the lower i / -2 / long; 

 spikelets i // -2^ // 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 breviseta (A. Gray) Scribn. 



(Fig. 376.) 



Pickering's Reed-grass. 



Calamagrostis sylvalica 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 i2 / -i8 / tall, erect, rigid, simple, scabrous 

 below the panicle. Sheaths smooth and glabrous, 

 the lower overlapping, the upper one elongated ; lig- 

 ule i // -3 // long; leaves i ^'-4' long, 2" wide, erect, 

 smooth beneath, rough above; panicle $'-^%' in 

 length, the branches ascending or erect, the lower 

 I'-i.^' long; spikelets i%"-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. 



