578 ORDER CXLJI. GRAMINACE.E. 



pie. Palece nearly equal in both flowers. — If. Oct Sand-hills on 

 the sea-coast. 2 — 3 feet. 



12. P. ramulo'sum, (Mich.) (P. debile, Ell.) Stem slender, decum- 

 bent, branching, glabrous. Leaves long, serrulate ; sheaths ciliate, 

 hairy at the throat. Glumes lanceolate, glabrous. Flowers in slender, 

 diffuse panicles. Pedicels 2-flowered. — If. Aug. — Oct. Damp soils. 

 2 — 4 feet. 



13. P. fea'gile, (Kunth.) (P. divergens, Muhl.) Stem assurgent, 

 slender. Leaves subulate, glabrous on the under surface, scabrous 

 above ; sheaths scabrous, longer than the joints. Flowers solitary, on 

 long peduncles. Glumes 1-flowered, with a subulate, accessory glume. 

 Pal: ,e shorter than the glumes. — If. June — Aug. Dry soils. 12 — 

 15 i .dies. 



14. P. dichot'omum, (Gross.) Stem procumbent, geniculate, pubes- 

 cent, branched toward the summit. Leaves pubescent, serrulate; 

 sheath pubescent. Flowers small. Glumes 2-flowered. — If. June — 

 Oct. Pastures and woods. Common. 1 — 2 feet. 



15. P. nodiflo'rum, (Lam.) (P. pauciflorum, Ell.) Stem erect, genic- 

 ulate, branching at the joints. Leaves narrow-lanceolate, acute, ciliate 

 at the base ; sheaths hairy. Flowers large, solitary, few. Glumes 1- 

 flowered, with an accessory valve. — y. May. Damp soils. 12 — 18 

 inches. 



16. P. consanguin'eum, (Kunth.) (P. villosum, Ell.) Stem erect, 

 villous, somewhat branched. Leaves erect, hairy, rigid ; sheaths 

 shorter than the joints. Flowers few, obovate. Glumes 1-flowered, 

 obovate. — 2f . April — May. Damp places. 1 — 2 feet. 



17. P. seta'oeum, (Mueh.) Peduncles solitary, 1-flowered, rarely pa- 

 niculate. Culm erect, csespitose, dichotomous, somewhat pubescent. — 

 Geo. 



18. P. Muehlenbergia'num, (Schal.) Culm smooth, branching from 

 the base ; nodes pilose. Leaves linear, glabrous ; branches of the pani- 

 cle solitary. Pedicels fiexuous, pubescent. — Geo. 



19 P. nit'idum, (Lam.) Stem erect, slender, glabrous. Leaves linear 

 lanceolate, expanding; sheaths shorter than the joints, hairy at the 

 throat. Flowers in a diffuse panicle, nearly spherical, small. Glumes 

 purple. — 2f . April — May. Damp soils. 1 — 2 feet. 



20. P. ova'le, (Ell.) Stem erect, pubescent, terete. Leaves ovate- 

 lanceolate, cordate, hairy at the base ; sheath contracted at the throat. 

 Flowers numerous, oblong, hairy. — If. Aug. — Sept. Middle and 

 Southern Geo. 1 — 2 feet. 



21. P. lanugino'sum, (Ell.) Stem pubescent, whitish. Leaves linear, 

 acute, downy ; sheaths lanuginous at the throat. Panicle diffuse, 

 Flowers small, nearly globular. Peduncles smooth. — 2f . July — Sept. 

 Middle Geo. 1—2 feet. 



22. P. microcar'pum, (Muhl.) Stem erect, simple. Leaves linear- 

 lanceolate, erect, slightly pubescent beneath ; sheaths hispid, hahy at 

 the throat. Glumes tinged with purple. — If. June — July. Banks of 

 streams. 2 — 3 feet. 



23. P. depaupera'tum, (Mueh.) Leaves linear-lanceolate; lower ones 

 Rhort, upper ones longer, pilose or glabrous ; sheaths pilose. Panicles 



