Phalaris. CLXl. GRAMINE^. 607 



2. S. GLAUCA. Palis. BotUe Grass. 



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



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



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



perfect/, transversely rugose.— (J) Fields and roadsides, N. Eng. to Ohio. Jl. Aug. 



0. (S. purpurascens. li. tj- S.) S/wiiths and spikelets pilose. — Penn. 



3. S. VERTiciLLATA. Palis. 



^9^. 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; 

 palea of tJie $ 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; spikif compound, interrupted 

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

 several times longer than the flower. — 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 ; sheatlis 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 ; $ 

 paiece smooth, obscurely 3-veined. — (i) In fields, not often cultivated. § 



23. CENCHRUS. 



Gr. Kev^^pos, millet; this grass bearing some resemblance to the millet. 



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

 iiate, persistent, including 1 — 3 spikelets ; glumes 2, 2-flowered. outer 

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

 scales 0. 



C. TRiBur.oiDEs. (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"; sheatlis 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, proditcing but 1 caryopsis. — ® Sandy soils, N. J. 



Tribe 5. PHALARE^. — 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. ^oKapoi, brilliant; on account of its smooth, shining seeds. 



Spikelets 1 -flowered ; glumes 2, subeqtial, carinate: paloce 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-edg'ed, on smooth, striate sheaths; panicle oblong, spicate, 

 somewhat secund, 3-— 4' long, glumes 3-veined, whitish, scabrous; nulimenti 

 pilose. — % Common in ditches and swamps. Can. to Car. and Ky. A large_ 

 showy grass, but not valuable. July, Aug. 



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

 leaves longitudinally striped in endless diversity, j- 



2. P Canarienses. Canarij 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. — Fields and pastures, not common. Jl. § 



