208 



GRAMINEAE. 



VOL. I. 



Panicle more or less contracted. 



Culms and almost filiform leaf-blades soft, not rigid. 8. C. neglecta. 



Culms and wide leaf-blades hard, rigid. 



Panicle elongated, loosely flowered ; culms not tufted, or little so. 9. C. ine.rpansa. 

 Panicle short, dense and spike-like ; culms strongly tufted. 



Panicle narrow, much interrupted below ; awn much shorter than the scale. 



10. C. labradorica. 

 Panicle thick, continuous, or little interrupted ; awn about equalling the scale. 



11. C. hyperborea. 

 Prolongation of the rachilla hairy only at the summit. 12. C. cinnoides. 



i. Calamagrostis Pickeringii Gray. Picker- 

 ing's Reed-grass. Fig. 500. 



C. sylvatica var. breviseta A. Gray, Man. 582. 1848. 

 C. Pickeringii A. Gray, Man. Ed. 2, 547. 1856. 

 C. breviseta Scribn. Mem. Torr. Club, 5: 41. 1894. 

 C. breviseta debilis Kearney, Bull. U. S. Dep. Agr. 

 Agrost. ii : 25. 1898. 



Culms i2'-i8' tall, erect, rigid, simple, scabrous 

 below the panicle. Sheaths smooth and glabrous, the 

 lower overlapping, the upper one elongated ; ligule 

 i "-3" long; blades i-4' long, 2" wide, erect, smooth 

 beneath, rough above ; panicle 3'-4s' in length, the 

 branches ascending or erect, the lower I'-ii' 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, Newfoundland to the mountains of New 

 England and northern New York. Occurs in the alpine 

 region of the White Mountains. Aug.-Sept. 



2. Calamagrostis lacustris (Kearney) Nash. 

 Lake Reed-grass. Fig. 501. 



C. breviseta lacustris Kearney, Bull. U. S. Dep. Agr. 



Agrost. ii : 25. 1898. 

 C. Pickeringii lacustris Hitchc. in Gray, Man. Ed. 7, 



134. 1908. 



Culms i2-3 tall, from rather stout rootstocks; 

 leaf -sheaths sometimes bearded at the summit ; blades 

 4~'-8' long, i "-2" wide, sometimes involute; panicle 

 up to 6' long, its branches short and erect ; spikelets 

 about ii" long, the empty scales acute, strongly his- 

 pidulous on the keel, the flowering scale rather thin, 

 the awn attached i-& way above the base, the basal 

 hairs one-half to two-thirds as long as the scale, the 

 palet markedly shorter than the flowering scale. 



Mountains of New England and along the Great Lakes 

 to Minnesota. 



3. Calamagrostis Porteri A. Gray. Porter's Reed- 

 grass. Fig. 502. 



C. Porteri 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 2"-2:j" long; 

 blades 6'- 12' long, 2 "-4" wide, rough; panicle 4'^-8' in 

 length, the branches erect, the lower i'-2' long; spikelets 

 2 "-22" long, the outer scales strongly scabrous, 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, southern New York to Virginia. Aug.-Sept. 



