PIULARIS. CLX1. GRAMINE^E. 607 



2. S. GLAUCA. Palis. Bottle Grass. 



St. 2 3f high ; Ivs. lanceolate, carina^e, rough, hairy at base ; sheaths 



striate, smooth ; slip, setose ; spike cylindric, yellowish-green, 2 4' long ; invol. 



of 6 10 fascicled, scabrous bristles much longer than the spikelets ; palea of the 



perfect ft. transversely rugose. Fields and roadsides, N. Eng. to Ohio. Jl. Aug. 



0. (S. purpurascens. R. fy S.} Sheaths and spikelets pilose. Penn. 



3. S. VERTICILLATA. Palis. 



St. smooth, about 2f high ; Ivs. lanceolate, rough-edged ; sheaths smooin. 

 hairy on the margin ; spicate panicle composed of short, divided branches in in- 

 terrupted verticils, 2 3' long ; bristles of the invol. in pairs, rough backwards ; 

 pokes of the $ roughish punctate. Sandy fields, N. Eng. to Ohio. July. 



4. S. ITALICA. Palis. 



St. somewhat compressed, about 4f high ; Ivs. lanceolate, 1 2f long, an 

 inch wide ; sheaths roughish, pilose at the throat ; spike compound, interrupted 

 at the base, nodding, 6 8' long ; spikelets conglomerate ; invol. of 2 bristles, 

 several times longer than the flower. Q Ditches, Mid. and S. States. July. 



5. S. GERMANICA. Palis. Millet. Bengal Grass. 



St. 2 4f high, simple, leafy ; Ivs. lance-linear, flat, acuminate, serrulate 

 on the margin ; sheaths striate, close, pubescent ; stip. bearded ; spike compress- 

 ed, yellowish, oblong-cylindric ; rachis densely hirsute ; involucrate bristles 4 8, 

 as long as, or longer than the spikelets, yellowish ; glumes unequal, ovate ; $ 

 palea smooth, obscurely 3-veined. (I) In fields, not often cultivated. 



23. CENCHRUS. 



Gr. Kv%pos, millet ; this grass bearing some resemblance to the millet 



Flowers racemose or spicate ; involucre burr-form, laciniate, echi- 

 nate, persistent, including 1 3 spikelets ; glumes 2, 2-flowered, outer 

 smaller ; flowers dissimilar, the lower sterile, the upper perfect ; 

 scales 0. 



C. TRiBULoiDEs. ( Also C. echuiatus Linn. 7) Burr Grass. 



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 hispid spines 

 as long as itself and containing 2 3 spikelets ; glumes acuminate-mucronate, 

 about 3" long, producing but 1 caryopsis. Sandy soils, N. J. 



TRIBE 5. PHALAREJ3. Inflorescence a contracted panicle. Spikelets 



solitary, with 1 perfect flower and 1 2 imperfect ones. Lower palea awned 

 or mucronate, upper with two keels. % 



24. PHALARIS. 



Gr. ^aAapoj, brilliant; on account of its smooth, shining seeds. 



Spikelets 1 -flowered ; glumes 2, subequal, carinate; palese 2, 

 coriaceous, awnless, shorter than the glumes, coating the caryopsis, 

 each with an external, accessory palea or abortive rudiment at base. 



1. P. ARUNDINACEA. (P. Americana. Tbrr.) 



St. erect, sparingly branched or simple, 2 5f high ; Ivs. spreading, lanceo- 

 late, veined, rough-edged, on smooth, striate sheaths ; panicle oblong, spicate, 

 somewhat secund, 34' long, glumes 3-veined, whitish, scabrous; rudiment* 

 pilose. Ij. Common in ditches and swamps, Can. to Car. and Ky. A large 

 showy grass, but not valuable. July, Aug. 



picta is the well-known striped or ribbon grass, with beautifully variegated 

 leaves longitudinally striped in endless diversity, f 



2. P CANARIENSES. Canary Grass. 



St. erect, or geniculate at the lower joints, round, striate, leafy; Ivs. lanceo- 

 late ; panicles spicate, ovoid, erect ; glumes whitish, with green veins ; rudiments 

 smooth. Q Fields and pastures, not common. Jl. 



