68 TRIANDRIA.— DIGYNIA. 



gin ; panicle much branched, smooth, many-flow- 

 ered ; spikelets oblong ; abortive floret antherifer- 

 ous, with the superior valve subherbaceous, shorter 

 than the inferior. 

 IIAB. Boggy meadows. July. U. Culm 3 — 4ft. high, 

 smooth; leav. sub coriaceous ; pan. pedunc. or sessile ; 

 fi. large. 

 8. P. macrocarpon : culm erect, simple ; leaves linear- 

 lanceolate, erect, a little hairy beneath ; joints na- 

 ked ; sheaths hispid ; panicle rather compound., 

 smooth ; spikelets ovate-globose ; abortive floret 

 neuter. 

 11 AB. Banks of rivers. July. U . Culm 3 ft. high ; 

 pan.few-fi.,flexuous ;fi. strongly nerved, subglobose; 

 inf. glume very broad. 

 >. P. pubescens : erect, much branched, leafy, softly- 

 pubescent; leaves lanceolate, ciliate; panicle small, 

 few-flowered, free ; spikelets subglobose-obovate, 

 pubescent. 

 IIAB. Woods and fields. June. U- Culm 18 in. high : 

 nodes hairy; sheaths retrorsely ciliate; pan. with 

 horizon, branches. 

 10. P. involution : culm cespitose, simple, or a little 

 branched at the base ; leaves erect, somewhat rigid, 

 very narrow, at length involute : panicle simple, 

 few-flowered ; florets acuminate ; superior valve of 

 the neuter floret very small. 

 HAB. Massachusetts. U. Culm 1 ft. high ; leav. a 

 little hairy; pan. 10—20-/. ; fi. large. 

 H. P. depauperatum : culm cespitose, hairy at the 

 joints ; leaves linear-lanceolate, smooth or hairy ; 

 sheaths pubescent ; panicle few-flowered ; branches 

 in pairs, one of them 2-£owered, the other 1 -flow- 

 ered. 

 IIAB. Barren sandy soils. May — June. U . Culm 1 

 ft. high ; lower leav. short ; pan. term. ; branches 

 tortuous. 

 i2. P. dichotomum: culm much branched and dichoto- 

 mous above ; branches fasciculate ; leaves very 

 numerous, lanceolate, smooth, panicle simple, ca- 

 pillary, lax ; abortive floret neuter ; superior valve 

 minute, bifid. 



