GRAMINEAE. 83 



acuminate, about one-half as long as the spikelet, 3-5 -nerved; second scale gen- 

 erally longer than the others, 5-7 -nerved, the third similar and usually subtending 

 a pa'let and staminate flower. In moist or dry soil, Me. and Ont. to Minn., south 

 to Fla., Kans. and Tex. Aug.-Sept. 



10. Panicum amarum Ell. Sea-beach Panicum. (I. F. f. 271.) A 

 tufted tall grass with glaucous foliage and large panicle. Culms 8-12 dm. tall; 

 sheaths overlapping; blades thick and leathery, involute on the margins, generally 

 3-6 dm. long or more, 8-12 mm. wide; panicle large, narrow, much-branched, 

 usually 3-7 dm. long, sometimes smaller ; spikelets numerous, 4-5 mm. long, 

 usually rather narrow, the first scale about one-half as long as the spikelet or a 

 little longer, the second and third scales about equal in length, all the scales very 

 acute or acuminate. In sands, along the coast, Va. to Fla. Aug.-Oct 



ti. Panicum agrostoides Spreng. Agrostis-like Panicum. (I. F. f. 249.) 

 Culms erect, 4.5-6 dm. tall, much branched, compressed, smooth. Sheaths com- 

 pressed, glabrous, or sometimes hairy at the throat; ligule very short, naked; 

 leaves 3 dm. long or more, 4-8 mm. wide, acuminate; panicles pyramidal, 1-3 

 dm. long, terminating the culm and branches; primary branches of the panicle 

 spreading, secondary generally appressed; spikelets 1.5 mm. long, acute, straight; 

 first scale 3 -nerved, acute; second and third scales 5 -nerved, about twice as long 

 as the first and longer than the oval fourth scale. Wet ground, Me. to Minn., 

 south to Fla., Kans. and Tex. July-Sept. 



12. Panicum longifolium Torr. Long-leaved Panicum. (I. F. f. 251.) 

 Culms erect, 3-6 dm. tall, slender, simple, or occasionally with a single lateral 

 panicle. Leaves 2-3 dm. long, 2-4 mm. wide, acuminate into a long, slender 

 point, rough, glabrous; ligule short, pilose; panicles 1. 25-2. 25 dm. long; primary 

 branches long and slender, spreading, secondary very short, appressed, generally 

 bearing 1-3 spikelets; spikelets 2 mm. long, acuminate; first scale acute, about 

 one-half as long as the acuminate second one; third scale equalling the second, 

 acuminate, one-third longer than the elliptic obtuse fourth one. Moist soil, Conn, 

 to Penn. and D. C. Aug-Sept. 



13. Panicum rostratum Muhl. Beaked Panicum. (I. F. f. 248.) Culms 

 erect from a creeping scaly branched rootstock, 4.5-15 dm. tall, much branched. 

 Sheaths glabrous, or the lower ones pubescent; leaves 3 dm. long or more, 4-10 

 mm. wide, acuminate; panicles pyramidal, 1.5-3 dm. long; axis and ascending 

 branches scabrous; spikelets 3 mm. long, crowded, lanceolate, acuminate; first 

 scale less than one-half as long as the spikelet; second scale curved at the apex, 

 scabrous above on the middle nerve; third scale usually subtending a small empty 

 palet. Moist soil, N. J. to 111. and Kans., south to Fla. and Tex. July-Sept. 



14. Panicum stipitatum Nash. Long Panicum. (I. F. f. 250.) Culms 

 erect, 9-15 dm. tall, much branched. Leaves 3 dm. long or more, 4-8 mm. wide, 

 acuminate, scabrous; panicles pyramidal, i-3dm.long; primary branches spread- 

 ing or ascending, the secondary usually divaricate; spikelets about 2.5 mm. long, 

 crowded, acuminate; first scale acute or acuminate, one-third the length of the 

 equal and acuminate second and third; fourth scale narrowly elliptic, about one- 

 half as long as the third and raised on a delicate stalk about 0.5 mm. long. Moist 

 soil, N. J. and Penn. to Ky., Tenn. and N. Car, "[uly-Sept. [P. elongaltimYursh.. 

 Not Salisb. 1796.) 



15. Panicum depauperatum Muhl. Starved Panicum. (I. F. f. 268.) 

 Culms erect, 3 dm. tall or less, simple or branched at base. Sheaths glabrous to 

 hirsute; leaves erect, elongated, 1-4 mm. wide, mostly crowded at base and equal- 

 ling or one-half as long as the culm, the upper culm-leaf often much exceeding the 

 panicle; primary panicle generally much exserted from the upper sheath, 2.5-7.5 

 cm. long, usually linear, its branches mostly erect; secondary panicles on very 

 short basal branches and often concealed by the lower leaves; spikelets 3-4 mm. 

 long, glabrous, acute. In dry places N. S. to Manitoba, south to Fla. and Tex. 

 June-Sept 



16. Panicum linearifolium Scribn. Linear-leaved Panicum. (I. F. f. 268a.) 

 Cu.ms tufted, very slender, erect, smooth and glabrous, simple, 1.5-4 dm. tall. 

 Sheaths glabrous or pilose with long white hairs; leaves elongated, glabrous or 

 more or less pilose, especially upon the lower surface, 7.5-25 cm. long, 2-4 mm. 



