392 MONOCOTYLEDONOUS PLANTS. 



the glume, boat-shaped, awnless, truncate. Panicle spiked, 

 dense, cylindric. 'friandria. Digynia. 



P. pratense Linn. : spike cylindric ; glumes truncate, mucronate, 

 with a ciliate keel ; awn shorter than the glume ; culm erect. 



HAB. Fields. N. S. June Aug. !(. Culm 23 feet high, 

 simple, smooth. Leaves flat. Spike long, cylindric, green. 

 Introduced. Herds Grass or Cats-tail Grass. 



9. PHALARIS. Linn. 



Glume 2-valved, 1-flowered ; valves nearly equal,'membra- 

 naccous, gibbous on the back, carinate. Palea 2, coriaceous, 

 hairy at the base, shorter than the glume. Rudiments oppo- 

 site, sessile, resembling valves. Scales collateral. -Flowers 

 generally in compound, ovate or elongated spikes. 



Triandria. Digynia. 



1. P. amencand Ell. : panicle oblong, spiked ; glumes boat-shaped, 

 serrulate ; paleee unequal ; rudiments hairy. P. arunttinacea Mich. 

 Calamagrostis colorata Nutt. 



HAB. Swamps. Can. to Car. July, Aug. It. Culm 25 

 feet high, erect, a little branching. Panicle 2 4 inches long, 

 at length a little spreading. American Canary Grass. 



2. P. canariensis Linn. : panicle subspiked, ovate ; glumes boat- 

 shaped, entire at the apex ; rudiments smooth. 



HAB. In pastures, &c. July. . Culm a foot and half high. 

 Leaves broad-linear. Glumes nearly twice the length of the pa- 

 lese. Introduced.- Canary Grass* 



10. CRYPSIS. Ait. 



Glume 2-valved, 1-flowered, compressed, unequal. Palca 

 2, unequal, longer than the glume. Statncris 2 3. Seed 

 loose, covered by the palese. Flowers in an oblong spike. 



Triandria. Digynia. 



C. virginica Nutt. : spike oblong-cylindrical, thick and lobed ; culm 



procumbent and geniculate ; leaves at length involute, rigid, pungent. 



HAB. Sandy fields. Near Philadelphia. Aug. Oct. . 



Culm 6 12 inches long, much branched from the base. Leaves 



at first flat, striate, hairy on the upper surface. Spikes lateral 



a.nd terminal. 



Div. II. PAKICEA. Inflorescence spiked or panichd. Spike- 

 lets either solitary, in pairs, or several together, one or more 

 usually 2-Jlowered, one of thefloioers being sterile or unisex- 

 ual. Glumes usually of a thinner texture than the palea, 

 which are more or less cartilaginous, the lower one half en- 

 folding the upper, and either beardless or occasionally beard- 

 ed j neither of them with a keel. 



