340 MONOECIA.— TRIANDRIA. 



HAB. Dry woods. May. Culm 1—2//. high; 

 leav. and sheath pubes. ; plant dull green. 



3. costata : spikes larger ; fruit strongly costate : 

 exterior sheaths purple. 



HAB. Rocky hills. Culm 2—3 ft. high. 

 S8. Chirsuta: spikes 3, erect, approximate, densely 

 fruited, upper one ovate-oblong, on a short pedun- 

 cle ; the rest ovate, subsessile, bracteate ; fruit 

 roundish-ovate, nerved, obtuse, smooth, orifice 

 entire, longer than the ovate acuminate glumes ; 

 leaves and sheaths pubescent. 



HAB. Rocky woods. May. Culm 12 — 18 in. 

 high; spik. thick ; young fr, pubes* 

 •9. C. Buxbaumii : spikes about 4, obovate, subre- 

 mote, upper one androgynous and pedunculate, 

 the rest sessile, with very long bracts ; fruit ovate, 

 obtuse, rather compressed, orifice entire, shorter 

 than the ovate acuminate (brown) glume. 



HAB. Sphagnous swamps. June. Culm 2 ft. high; 

 glume dark br. ; ft. green. 



40. C. digitalis : spikes mostly 4, distant, slender, pe- 

 dunculate, loosely-flowered, nodding ; uppermost 

 androgynous, fertile above; the rest all fertile; 

 fruit oblong, subtriquetrous, obtuse, smooth, 

 longer than the oblong mucronate glume. 



HAB. Meadows. May. Culm 18 in. high, slend. ; 

 spik. filif. ; plant pale green. 



41. C.formosa : spikes 4, oblong, thick, distant, on ex- 

 sert peduncles, nodding, uppermost one sterile at 

 the base ; fruit oblong, triquetrous, somewhat in- 

 flated, rather acute at each end ; orifice nearly en- 

 tire or 2-lobed, obscurely nerved, twice as long 

 as the ovate acute glume. 



HAB. Meadows. Culm 12 — 18 in. high; leav. 

 often subpubes. ; plant yellowish-green. 

 12. C. Torreyana : spikes 4, filiform, pedunculate, 

 somewhat nodding, uppermost one sterile at the 

 base ; fruit oblong, triquetrous, acute at each end, 

 slightly 2-lobed, shorter than the oblong awned 

 glume ; leaves and sheaths pubescent. 

 HAB V Meadows. Culm 18 in. high f leafy; spik-. 

 *Und.; rachisjlex. ; glum, hyaline. 



