PHALARIS. CLX1. GRAMINE^E. 607 



2. S. GLAUCA. Palis. Bottle Gi'ass. 



Sf. 2 3f high ; Ivs. lanceolate, carinate, rough, hairy at base ; sheaths 



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



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



perfect fl. transversely rugose. (T) Fields and roadsides, N. Eng. to Ohio. Jl. Aug. 



/?. (S. purpurascens. R. fy S.) Sheaths and spikelets pilose. Penn. 



3. S. VERTICILLATA. Palis. 



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

 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 ; 

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



4. S. ITALICA. Palis. 



St. somewhat compressed, about 4f high ; Ivs. lanceolate, t 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. (T) Ditches, Mid. and S. States. July. 



5. S. GERMANIC A. 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. (J) In fields, not often cultivated. 



23. CENCHRUS. 



Gr. Kcv%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. echinatus Linn. 1) 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 23 spikelets ; glumes acuminate-mucronate, 

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



TRIBE 5. PHAL.AREJB. 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. (pa\af>os, 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. Torr.} 



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, 3-^-4' long, glumes 3-veined, whitish, scabrous; rudiments 

 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. <J) Fields and pastures, not common. Jl. 



