Phalaris. CLXl. GRAMINEiE, 607 



2. S. GLAUCA. Palis. Dottle Grass. 



St. 2 — 3f high ; Ivs. lanceolate, carinate, 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 Jl. transversely rugose. — (T) Fields and roadsides, N. Eng. to Ohio. Jl. Aug. 



0. (S. purpurascens. B. <^ S.) Sheaths and spikelets pilose. — Penn, 



3. S. VERTICILLATA. Pal IS. 



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

 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; 

 palecB of the ^ roughish punctate. — ® Sandy fields, N, Eng. to Ohio. July. ^ 



4. S. Italica. Palis. 



St. somewhat compressed, about 4f high ; Its. 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. — (i) 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 ; slip, 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 ; $ 

 palece smooth, obscurely 3-veined. — 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- 

 uate, 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. cchinatus Linn. ?) Burr Grass. 



St. 1 — 2f long, erect or procumbent and geniculate at base ; Ivs. lance- 

 linear, conduplicate, gradually acuminate, 3 — 5' by 2 — 3"; sJicaths 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. PHALAREJ!:.— Inflorescence a contracted panicle. Spikelets 

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

 or mucronate, upper with two keels. 



ai. PHALARIS. 



Gr. <pa\apoi, l)rilliant; un account of ita smooth, shining scedti. 



Spikelets 1 -flowered ; glumes 2, subequal, carinate; paleae 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—1' long, glumrs 3-veined, whitish, scabrous; rudiments 

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

 showy grass, but not valuable. July, Aug. 



(i picta is the well-known stripeil or ribbon grass, with beautifully variegated 

 leaves longitudinally striped in endless diversity, -f- 



2. P Canariknsks. Cananj Gra.^s. 



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

 late; panicles spicate, ovoid, erect ; glumrs whitish, with green veins; ruflim«^is 

 smooth. — (D Fields and pa.stures, not roinmoii. Jl. § 



