ORDER CXLII. GRAMINACE^E. 589 



terior palea with the midrib green. — 0. Through the summer. Moist 

 cultivated lands. G — 18 inches. 



7. P. Lixk'ii. (Kunth.) (P. tenella, Ell.) Stem decumbent, glabrous. 

 Leaves subulate, scabrous on the upper surface ; sheath hairy at the 

 throat. Panicle expanding, with verticillate branches ; exterior palea 

 purple, 3 — 5-nerved. — -0. Through the summer. Cultivated grounds. 

 Common. 6 — 12 inches. 



§ 2. Spikelets paniculate, few-flowered, rather remote. 



8. P. annua, (L.) Stem glabrous, procumbent, geniculate. Leaves 

 glabrous. Panicle diffuse ; spikelets usually 4 — 5-flowered. Glumes 

 slightly pubescent. — f|. Feb. — April. Cultivated grounds. 6 — S in. 



9. P. vm'iDis, (Schr.) Stem erect, oblique at the base, striate, gla- 

 brous. Leaves glabrous, linear, flat. Panicle diffuse, with 3 or 4 branch- 

 es at each joint. Glumes acute, margins scarious, white ; spikelets 3 — 

 5-flowered, woolly at the base. — If. May — June. Common. 2 — 3 feet. 



10. P. fer'tilis, (Host.) (P. angustifolia, Wahl.) Stem glabrous, 

 erect. Leaves linear, glabrous, involute, upper ones broadest. Panicle 

 crowded ; spikelets usually 4-flowered, villous at the base. Paleai 

 tinged with purple, villous at the base. — If. May — June. Common. 

 1—2 feet. 



11. P. 'spectab'ilis, (Pursh.) (R. refracta, Ell.) Stem erect, terete, 

 glabrous. Leaves slightly hairy. Panicle diffuse, large ; spikelets 15 

 — 20-flowered ; exterior palea 3-nerved. — 2£. August — Sept. Damp 

 soils. 2 feet. 



12. P. ten'uis, (Ell.) Stem somewhat compressed, much branched, 

 glabrous. Leaves linear, long, scabrous ; throat of the sheath hairy. 

 Panicle diffuse, capillary ; spikelets 1 — 3 flowered. Glumes glabrous. 

 Paleai glabrous, the exterior one keeled. — If. Aug. — Sept. Upper 

 Car. 12 — 18 inches. 



13. P. mtcran'tha, (Schult.) (P. parviflora, Ell.) Stem simple, de- 

 cumbent, compressed, leafy. Leaves distichous, flat, glabrous ; sheath 

 glabrous. Panicle diffuse, capillary; spikelets generally 3-flowered ; 

 florets obtuse, caducous. — If. July. Shady woods. Middle Carolina 

 and Georgia. 



14. P. autumn a' lis, (Muhl.) Stem erect, glabrous. Leaves slightly 

 scabrous, flat. Panicles diffuse ; spikelets generally 3-flowered. 

 Glumes unequal; exterior palea obtuse, 5-nerved. — If. Aug. — Sept. 

 Middle Car. and Geo. 12 — 18 inches. 



15. P. nit'ida, (Ell.) Stem erect, glabrous. Leaves linear ; throat of 

 the sheath slightly hairy. Panicle diffuse, capillary ; spikelets 7 — 9- 

 fiowered. Glumes compressed ; exterior palea 3-nerved, transparent. 

 — Q. Through the summer. Cultivated lands. 12 — 18 inches. 



16. P. confer'ta, (Ell.) Stem erect, geniculate, terete, swollen at the 

 joints. Leaves glabrous, flat. Particles terminal and axillary, erect ; 

 spikelets 8-flo\vered, smooth; exterior palea with colored veins. — If. 

 July — Aug. Middle Car. and Geo. 2 — 3 feet. 



17. P. flu'itans, (Scop.) ( G lyceria fluitans, Brown.) Stem erect, 

 glabrous. Leaves scabrous on the upper surface; sheaths glabrous, 

 with large Btipulea Panicle branching; spikelets sessile, 9 — 10-llow- 

 ered. Glumes membranaceous, smaller than the palea?; exterior palea 

 7 -nerved, obtuse. — 2;. May — Aug. Upper districts. 1 — 2 feet. 



