578 ORDER CXLII. GRAMINACEJ2. 



pie. PalccB nearly equal in both flowers. — 1i. Oct. Sand-hills on 

 the sea-coast. 2 — 3 feet, 



12. P. RAMULo'siJM, (Mich.) (F. debile, Ell.) Stan slender, decum- 

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

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

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

 2—4 feet. 



13. P. fra'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. 

 FcUece shorter than the glumes. — U- June — Aug. Dry soils. 12 — 

 15 inches. 



14. P. dicuot'omum, (Gross.) Stem pi-ocumbent, 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. paudf.orum, Ell.) Stem erect, genic- 

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

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

 flowered, with an accessory valve. — If. 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. — If. April — May. Damp places. 1 — 2 feet. 



17. P. seta'ceum, (Much.) Peduvcles solitary, 1-flowered, rarely pa- 

 niculate. Culm erect, ciespitose, dichotonious, somewhat pubescent, — 

 Geo. 



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

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

 cle solitary. Pedicels flexuous, pubescent. — Geo. 



19 P. nit'idum, (Lam.) >S^em erect, slendt^r, glabrous. Leaven Imenr 

 lanceolate, expanding; sheaths shorter than the joincs, hairy at XAm 

 throat. Flotcers m a diifu,-=e panicle, nearly spliericai, tma'i. G'umci 

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



20. P. ova'le, (Ell.) Ste7n erect, pubescent, terete. Lfovs r.v,;tp- 

 lanceolate, cordate, hairy at the b.ise ; sheath contracted at the ti^rtiai 

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

 Southern Geo. 1 — 2 feet. 



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

 acute, downy ; sheaths lanuginous at the throat. Pam'de difiuse 

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

 Middle Geo. 1—2 feet. 



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

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

 the throat. Glumes tiuged \fith -purph'.— U- June — July. Banks of 

 streams. 2 — 3 feet. 



23. P. depaupera'tum, (Mueli.) Xr«i'<?s linear-lanceolate ; lower ones 

 ehort, upper ones longer, pilose or glabrous ; sheaths pilose. Panieleg 



