"788 Cedes 156.— GBAMIUE:^. 



sheaths ciliate; pan. of remote, short (6"), dense, alternate spikes, the rachis flex- 

 uous;' glumes nearly eqiud, both owned; lower pale with a stout awn which ia 

 much longer than those of the glumes; upper pale minute; fertile fl. lanceolate. — 

 Dry shades, Car. to Ga. and La. Aug. — Oct. (Panioum, L.) 



20. SETA'RIA, Beauv. Beistly Fox-tail Grass. (Lat. seta, a 

 bristle.) Spikelets, &c. as in Panicum, but each subtended by a cluster 

 of awn-like bristles (abortive pedicels), forming a sort of bristly invo- 

 lucre. — Fls. in dense, cylindric spikes or spike-like panicles. 



§ Bristles of the involucre rongli backwards, in pairs, short No. 1 



§ Bristles rough upwards. — Fertile pales strongly rugous crosswise Nos. 2, 3 



— Fertile pales smoothish, striate lengthwise No. 4 



— Fertile pales smoothish, not striate .ilos. 5, 6 



1 S. vertioillata Beauv. Culm smooth, about 2f high ; Ivs. lance-linear, rough- 

 edged ; sheaths smooth, hairy on the margin ; spicate pan. composed of short, 

 divided branches in interrupted verticils, 2 — 3' long; bristles of the invol. in pairs, 

 rough backwards, as well as the upper part of the culm ; palese of the 5 roughish- 

 punctate. — (I) Sandy fields, K. Bag. to Ohio, more frequent South. July. § 



2 S. glauoa Beauv. Bottle Grass. Culm 2 — 3f; Ivs. lanoe-linear, carinate, rough, 

 hairy at base ; sheaths striate, smooth ; ligules setous ; spike cylindric, yeUowish- 

 green, 2 — 1' long, nearly simple ; invol. of 6 — 10 fascicled, scabrous bristles much 

 longer than the spikelets; fertile pale, transversely rugous. — (J) Fields and road- 

 sides, K. Eng. to Ohio. Jl., Aug. 



|8. PUEPUEASOEKS. Sheaths and spikelets pilous, awns purple. 



3 S. oorrug^ta Schul. Culm terete, 2 to 3f; Ivs. linear, 8 to 12' by 3 to 4", 

 very scabrous, as well as the sheaths ; ligules setous ; pan. terete, dense, spike- 

 like, 3 to 6' long, compounded of many appressed spikes, each of many spikelets; 

 bristles as many as spkls. (one at the base of each) and 3 or 4 times as long ; 

 caryopsis and its pales strongly corrugated (ElUott). — Savannah (Baldwin). 



4 S; viridis Beauv. Wild Timothy. Culm smooth, 2 — 3f; Ivs. lanceolate, flat, 

 minutely serrulate ; sheaths striate, hairy on the margin, and with a setous stipule ; 

 spike 1 to 3' long, cyhndric, compound, terminal, green ; involucre of 4 — 10 fas- 

 ciculate bristles, much longer than the spikelets; palea^of the perfect flower longi- 

 tudinally striate, punctate, and minutely corrugated under a lens. — (J) Common in 

 cultivated grounds. Northern States. July, Aug. 



5 S. It^lioa Kunth. Culm somewhat compressed, about 4 to 6f high ; Ivs. lan- 

 ceolate, 1 — 2f long, an inch wide ; sheaths roughish, pilous at the throat ; spiko 

 compound, interrupted at the base, nodding, 6 — 8' long sometimes 12 to 18' long 

 and V thick (Feay) ; spikelets conglomerate ; invol. of 2 or more bristles, several times 

 longer than the flower ; fertile ft. polished, shiming, J" long. — ® Ditches, Mid. and 

 S. States. July. 



6 S. Germanica Beauv. Millet. Bengal GEAsa Culm 2 — 4f high, simple, 

 leafy ; Ivs. lance-linear, flat, acuminate,- serrulate on the margin ; sheaths striate, 

 close, pubescent; stip. bearded; spike compressed, yellowish, oblong-cylindrio ; 

 rachis densely hirsute ; involucrate bristles 4 — 8, as long as, or longer than the 

 spikelets, yellowish; glumes unequal, ovate; S paieae 1" long, obscurely 3-veined, 

 dun with minute corrugations. — ® In fields, often cultivated. § (S. Italica B. 

 Kunth.) 



21i CENCHRUS L. Bues Grass. (Gr. KEv;t;pof, the ancient name 

 of the millet.) Flowers racemous or spicate ; involucre burr-form, 

 laciniate, echinate, persistent, and becoming hard in fruit, including 

 1 — 3 spikelets ; glumes 2, 2-flowered, outer smaller ; flowers dissimlar, 

 the lower sterile, the upper perfect; scales 0; branching; spikelets 

 sessile. 



1 C tribuloides L. St. 1 — 2f long, erect or procumbent and geniculate at 

 base ; Ivs. lance-linear, conduplicate, gradually acuminate, 3 — 5' by 2 — 3" ; sheaths 

 open, about as long as the colored joints; spike with the burr-like involucres 

 approximate ; invol. cartilaginous, beset externally with many sharp, retrorsely 



