4*28 GRAMINEiE. 



SfiC. I. Dicitaria, Scop. Finger Crass. Sjiikelets crowded, 2 or 3 together ic 

 simple and mostly 1-sided cluster* d .spikes or spike-like racemes.— Annuals. 



1. P. SANGUIXALE, L. Finger-grass. Crab-grass. 

 Spikes 4 to 15, digitate-clustered ; spikelets oblong, downy -margined ; upper glume 



shorter than the flower. 



Cultivated grounds, everywhere naturalized. Aug. — Oct. CVwl2to 18 inches 

 high, spreading from the tufted base, then upright. Leave* linear-lanceolate, and 

 v -itrii the sheaths rather hair/. Spikes and often the leaves purplish. 



2. P. GLABRUM, Gaudin. Smooth Finger-grass. 



Spikes digitate, somewhat alternate, spreading; spikelets ovoid, rather hairy; 

 upper glume nearly equalling the flower. 



Sandy fields. Aug., Sept. Culm 6 to 12" inches high ; procumbent or spreading. 

 Spikes mostly 3 (2. to 0), about 2inohes long. 



3. P. filiforme, L. Slender Finger-grass. 



Spiles 2 to 8, alternate and approximated, thread-like ; spikelets all distinctly 

 pcdicelled, oblong, acute; lower glume none. 



Dry sandy soil. Aug. Culms extremely slender, 1 to 2 feet high. Leo res nar- 

 row, 1 to 2 inches long. Spike* mostly 3, 1 to 2 inches long ; rachit rough, Bexueaa . 



Sec. ii. PasKUM proper. Panic-Grass. Spikelets scattered, awnless. — Mostly 

 perennials. 



4. P. ANCEPS, Michx. Two-edged Panic-grass. 



Fanicle contracted, pyramidal ; spikelets ovate-lanceolate, pointed, a little curved ; 

 uj per glume 7-nerved ; neutral flowers }/ s longer than the perfect, of 2 palete. 



Wet soil. Aug. Calms f\at, upright, 2 to 4 feet high*. Lea ves linear-lanceolate, 

 1 to 2 feet long, % to }/£ inch wide, sincothish. 



5. P. AGROSTOIDES, Spreng. Agrostis-Mce Panic-grass.. 



Panicles terminal and often lateral, pyramidal: j aome, crowded and 



1-sided, on the spreading branches, ovate-oblong, acute, purplisj . a w 5- 



nerved, longer than the neutral flower, with 2 paleae. 



Wet meadows. Aug. Calm 2 to 3 feet high, flattened, upright. Leaves long 

 and with the sheaths smooth, tufted. Panicle 4 to 8 inches long, mostly dark 

 purple. 



6. P. proliferum, Lam. Proliferous Panic-grass. 



Smooth throughout; panicles terminal and lateral, compound, pyramidal; 

 spikelets appressed, lance-oval, acute; lower glume broad, x / z to % the length of the 

 upper; neutral flower little longer than the perfect one, of a single paleag. 



Wet meadows and marshes. Aug., Sept. Ann. Culms thickened, succulent, 

 branched, ascending from a procumbent base. Leaves 8 to 12 inches long; sluaths 

 flattened. 



7. P. CAPILLARE, L. JTair-staVced Panic-grass. 



Panicle pyramidal, capillary, compound and very loose, with slender straight 

 wranches, reflexed when old ; spikelets scattered on long pedicels, oblong, pointed ; 

 lower glume half the length of the single paleae of the neutral flower. 



Sandy soil and cultivated fields, common. Aug., Sept. Ann. Culm upright, 

 often branched at base and forming a tuft. Leaves flat, broad, and with the 

 flattened sheaths hairy. Panicle often purplish. 



8. P. latifolium, L. Broad-leaved Panic-grass. 



Panicle terminal, a little exserted, simple, pubescent; spilcelets oblong-ovoid, 

 downy; lower glume ovate, not % the length of the many-nerved upper one; sterU* 

 Jlpwtr mostly with 3 stamens. 



