iQ TRIANDRIA, DIGYNIA. aristida. 



brous on the upper surface. Sheaths short, open, smooth. 

 Panicle elongated, loose. Flowers on short, appressed, cla- 

 vate pedicels' Calyx a third longer than the corolla ; glumes 

 unequal, purple, lanceolate,, mucronate, or terminated by a 

 short cusp. Corolla cylindrical, often spotted with dark, purple ; 

 inferior valve involute, hairy at the base ; the middle awn a 

 little longer than the lateral ones; superior valve very snort, 

 membranaceous. Seed cylindrical, slender. 

 Hab. In sandy fields and woods ; abundant in the pine-barrens 

 of New- Jersey. Deerfield, Massachusetts. Dr. Coo ley, 

 September — October. 



Nearly allied to the preceding species, and perhaps not 

 distinct. 



7. MUHLENBERGIA. Schreber. 



Calyx very minute, 2-valved, (l-valved Schreb.-—' 

 MuhL) truncate, unequal. Corolla 2-valved, hairy at 

 the biise, inferior valve terminating in a slender bristle. 

 Gen. pi 103. Schreb. Gram, t. LI. Nu 1 1. Geiu 

 I. p. 41. Tr i 77. Agrost. 40. F. de Beaiiv. t VIL 

 f. 9. Roem. ^ Schult. Gen, 236. Dilepyrum 

 Mich. Fl. I. p. 40. Flowers paaicled. 



M. diffusa Schreh.: culm diffuse, (dtecumbent ;) 

 leaves linear-lanceolate^ panicle branched, appressed ; awns 

 as long as the corolla. Schreb^ 1, c. fVilld. Spec, I, 

 p. 320. Enum. hort. Berol. I. p. 81. Pursh Ft. I. p. 61. 

 Elliott Sk.\. p. 98. t. 5. f. 1 . MuhL Gram, I. p. 56. 

 Roem. S^ Schult, II. p. 383. 



Moot fibrous, perennial. Culm decumbent, about a foot and & 

 half long, compressed, geniculate, branched ; branches assur- 

 gent. Leaves scabrous, naked, about 3 inches long and 2 lines 

 wide. Sheaths open, striate, smooth. Stifiule very short, trun- 

 cate, finely lacerate. Panicle terminal and lateral, very slender, 

 consisting of interrupted appressed racemes; branches scabrous. 

 Flowers pedicellate. Calyx persistent, exceedingly minute, 

 (not a sixth part as long as the corolla ;) glumes laeiniate, re- 

 sembling bracts. Valves of the corolla unequal ; the inferior 

 longer, linear-lanceolate and almost triangular, with 3 promi- 

 nent scabrous nerves ; bristle slender, scabrous, purple ; supe= 

 rior valve indistinctly 3-nerved, awnless. Stamens 3 ; anthers 

 pale yellow. Styles 2 ; stigmas feathered. Seed linear-oblong, 

 Hab. On dry and rocky hills, and in fields ; common on the hills 

 between Bergen and Weehawk, New-Jersey. August — Sep- 

 tember. 



8. TRICHODIUM. Michaux, 

 Calyx 2-valved; valves nearly equal, serrulate on 

 the keel. Corolla 1-valved, smaller than the calyx. 



