404 



ORDER 155. GRAMINE^E. 



2 U. paniculata L. Sea-side Oats. Culm 4 Sf; Ivs. long, narrow, rolled, fringed 



at throat, ; spikelets ovate, short-pedicelled, 12-20-flwd. ; lower pale obtuse, 9 -veined; 

 stamens 3. ~U Sand-hills, coastward, Va. to Fla. July. 



3 V. nitida Baklw. Culm wiry, 2 3f; lv&. narrow, flat; pan. simple; spkl. snbseis- 



sile, broad, with about 7 long-pointed fls. Sta. 1. it Ga. to La. 



4 TI. gracilis MX. (d) Slender, 3 4f; Ivs. broad-linear, flat; pan. long, simple, 



branches solitary, appressed ; spkl. (e) 2", 3^-flvvd. Sea-coast, N. Y., and South. 



50. PHRAGMITES, Trin. REED. Fls. 36, the 

 lowest sterile and monandrous ; rachis beset with long 

 silky hairs. Gl. acute, keeled, very unequal. Lower. 1 

 pale subulate, silky villous at base. Sta. 3. Grain freej 

 U Tall ; Ivs. broad and flat ; panicle diffuse. 



P. commuiii* Trin. Culm erect, 6 12f, near 1' thick; Ivs. 

 12' broad ; pan. effuse, spkl. (a) 4-5-flwd., erect; fls. (b) col- 

 ored, as long as the white hairs. Ponds. July. 



51. ARUNDINARIA, Rich. CANE. Spkl. flat- 



tened, 5-12-flwd., fls. all 5 , trian- 

 'drous, remote. Gl. (a) small. Lower pale lance- 

 ovate, rounded, awn-pointed. Stigmas (b) 3. Grain 

 (c) free. *> 5 Tall, branching, leafy. Flowers in 

 spikes or panicles. 



A. macrosperma MX. (a) Culm woody, from strong 

 running root-stocks, 10 25f high, with fascicled branches ; 

 Ivs. lanceolate. If and less ; spkl. 1 2f long, subsessile 

 on leafless axillary or radical branches (from the rhizome). 

 Swamps, Va. to Ky., and S., forming the brakes. 

 /3. teria. Culm 2 lOf; Ivs. lance-linear; spikes mostly 

 radical. 



52. LEPTURUS, Br. Spikelet 1 on each joint of the fili- 

 form rachis impressed into a cavity, 1- or 2-flwd. Gl. coriace- 

 cus, acute, subulate. Pales acute, subequal. Stam. 3. Grain 

 linear, free. (T) Culm branching, loaves very narrow. Spikes 

 solitary or panicled. 



panic ulatus N. (c) Culm ascend- 

 ing, 1018' ; Ivs. near the base, fili- 

 form-subulate, short : rachis of th 

 culm, the slender spikes 2', alternate. , 

 remote; spkl. 2", gls. lateral, shorteJ 

 than the pales. Illinois to Louisiana. 



53. HORDEUM, L. BARLEY. Spkl. 3 

 at each joint of the rachis, 2-rlowered, the 

 Literal imperfect or abortive. G!. 2, subulate, 

 awned, collateral, all in front of the cluster. 

 Lower pale long-awned, both adhering to grain. 



II. jubatum L. Squirrel-tail G. (a) Culm terete, 2f; Ivs. broad-linear; epike 

 -2y long; spkl. (b) with the lateral fls. neuter, the 7 awns 6 times (2') as long ftfl 

 Mil- How IT*. Marshes, N. Eng. to Mo., and N. June. 



