OEDER CXLIT.— GKAMK\ACi;.E. 581 



8. 0. mtjeica'tus, (Kunth.) {Panicnm Waltrri, Pursh.) Sinn erect, 

 Blonder, glabrous. Leaves horizontal, glabrous; throat of tlio elx-ntb 

 ciliate. Flowers in alternate spikes, in three rows; racliis scabrous. 

 Glumes 2-flowered, perfect and sterile. — Q. Tlirough the Kutntnor 

 In damp soils. Low country. 2 — 3 feet. 



Gexus XIII.— SETA'RIA. Beauv. 

 (From seta, a bristle.) 



Sjnkelets 2-flowercd, invested with an involucre of two or 

 more bristles. Glumes 2, unequal ; lower flower abortive. 

 Palece 1 — 2, herbaceous ; upper flower perfect. Pulccc carti- 

 laginous. Flowers in compound, cylindrical spikes. 



1. S. GLAu'cA, (Beauv.) {Panicnm glaucum, Ell.) Stem erect, gla- 

 brous, slightly compressed. Leaves linear-lanceolate, acute ; upper 

 surface scabrous; spike cylindrical. Glwncs with an accessory one, 

 acute, 3-nerved. Palece 2, the exterior one obscurely Snerved. Aicns 

 8 — 10, in two fascicles. — 0. July — Aug. Roadsides. 2 feet 



There are two or three varieties of this plant, varying in the direction of the >tcm, 

 and in the number of the flowers in the spikclets, and in being {mbescctit. 



2. S. corruga'ta, (Schul.) {Paniciim corrugatum, Ell.) Stem erect, 

 terete, slightly scabrous. Leaves acute, scabrous ; sheaths longer tlian 

 the joints. Flotcers in compound, compact spikt-s; sfiikelcts with about 

 half the flowers fertile, the others sterile. Glmncs \\\\\\ an accessory 

 valve, 5-nerved. Palece as long as the gluniis, the exterior one wrin- 

 kled. — li. Through the summer. Low country. 2 — 3 feet. 



3. S. l^.viga'ta, (Schul.) {Panicnm hvif/atnm, Aluhl.) Stem pro- 

 cumbent, compressed, the upper joints longest. Leavrs narrow, fjln- 

 brous ; sheaths compressed ; spike eolunuiar ; sj)ikelels 1 flowered. 

 Lnvolucels 10-awned. — Zf. Through the summer. Sea-is-laiul^. I — 2 

 feet. 



4. S. affi'nis, (Schul.) Leaves linear-lanceolate, pilose ; .'•heaths stri- 

 ate ; ligule bearded. Peduncles pubescent ; bracts purple at tho 

 apex. Flou'ers in elongated fascicles. — Geo. to Petui. 



5. S, Ital'ica, (Kunth.) (Panicum Italicuvi, L.) Stem erect, slightly 

 compressed, tomentose. Leaves very long, channeled, .«cabrou.^ the 

 sheath with the throat and margins ciliate ; 8i>ikes compressi-d. with 

 the spikelets many-flowered. /?ii'o/?<c-rf longer than the fluwers. Olumrt 

 2-flowered, only one palca3 to the sterile floret. — If. .\ug.— Sept. 

 Wet soils. 2—10 feet. 



Genus XIV.— CEN'CHRUS. Beauv. 

 (A Greek name of Setari a Jtatica.) 



Involucre 1 — 3-flowered, many-jxirted, bristly. O'luf'^i's 2, 

 2-flowered, exterior ones smallest ; the exterior floret sterile, the 

 other perfect Palece 2, unawned. 



