ORDER CXLII. GRAMIXACE.E. 579 



terminal, erect. Glumes acute, lanceolate, smooth. — Car. and north- 

 ward. 



24. P. vis'cidum, (Ell.) Stem erect and decumbent, branching, very 

 pubescent and viscid at the joints. Leaves slightly cordate, pubescent, 

 ciliate ; sheath viscid. Panicle expanding. Flowers pubescent, obo- 

 vate. Glumes 2-fiowered. Paleai of the sterile floret very small — % . 

 June. Damp soils. 2—4 feet. 



25. P. ciliatifo'lium, (Kunth.) (P. ciliatum.) Stem decumbent, te- 

 rete, glabrous. Leaves lanceolate, ciliate; sheath glabrous, ciliate. 

 Glumes 2-fiowered, with an accessory glume. Paleaz of the neutral 

 floret smalL — %. March — ApriL Damp soils. 4 — 10 inches. 



26. P. exsifo'lium, (Ell.) Stem erect, slender. Leaves ovate-lanceo- 

 late, acute, glabrous ; sheath short, glabrous Flowers small, pubes- 

 cent. — If. April — May. Damp soils. 12— 18 inches. 



27. P. barbula tum, (Mich.) Stem erect, usually geniculate, with the 

 joints bearded, branching at the base. Leaves ovate-lanceolate, gla- 

 brous, expanding ; sheath glabrous, ciliate. Glumes 2-flowered, pubes- 

 cent. Paleo3 of the perfect flower equaling the glumes ; of the sterile 

 flower only one, small. — If. April — July. Damp soils. 10 — 15 

 inches. 



28. P. pubes cexs, (Lam.) Stem erect, much branched, pubescent. 

 Leaves lanceolate, ciliate, pubescent. Stipules bearded. Glumes 2- 

 fluwered, obovate. Palece of the perfect flower longest. — If. July — 

 Aug. Shady woods. 1 — 2 feet. 



29. P. sph^erocar'pcm, (Ell.) Stem erect, terete, glabrous. Leaves 

 linear-lanceolate, acute, glabrous, ciliate at the base. Panicle expand- 

 ing. Flowers small, pubescent. Fruit globular. — 2f. April — May. 

 Middle Geo. 12 — 18 inches. 



30. P. AN'GusTiFo'uuir, (Ell.) Stem slender, glabrous. Leaves linear- 

 lanceolate, ciliate at the base, scabrous above, glabrous beneath. Flow- 

 ers solitary, pubescent. — If. May — June. Shaded soils. 1 — 3 feet. 



31. P. heterophil luji, (Bos.) (P. multijlorum, Ell.) Stem erect, 

 glabrous. Leaves broad-lanceolate, pubescent at the base and ciliate, 

 slightly undulate. Flowers in a much branched panicle, small, pubes- 

 cent. — 2f . May — July. Shaded soils. 2 — 3 feet. 



32. P. melica'rium, (Mich.) Stem slender, glabrous. Leaves long, 

 narrow, glabrous. Panicle contracted, slender. Glumes 2-flowered, 

 membranaceous, nearly equal. — If. April — June. Car. and Geo. 



33. P. an'ceps, (Mich.) Stem compressed, branching, geniculate. 

 Leaves hairy ; sheaths hairy, longer than the joints. Panicle expand- 

 ing, turning to one side. Glumes 2 — 3-flowered, perfect and sterile. 

 Paleee shorter than the calyx. — If. Aug. — Nov. Wet soils. Com- 

 mon. 2 — 1 feet. 



34. P. capilla're, (Gross.) (P. strigosum, Ell.) Stem assurgent, 

 branched, villous. Leaves lanceolate, ciliate, villous. Panicles large. 

 Glumes 2-fiowered, obovate. Palece of the sterile florets very small. — 

 If. April — May. Damp soils. 12 — 15 inches. 



35. P. scopa'rium, (Lam.) Stem erect, villous. Leaves glabrous on 

 the upper surface, 3 — 6 inches long. 1 — 2 wide, pubescent beneath. 

 Flowers few, large. Glumes 2 flowered, pubescent, with an accessory 

 valve. Palece of the perfect floret larger than those of the sterile one, 

 — If. April — May. Shady places. 2 — 3 feet. 



