GRASSES. 371 



ing glnmo two-thirds of the length of the empty ones. From the latter it is distin- 

 guished by the more slender branches of the panicle, with the spikelets less crowded 

 above the middle of the branches, the smaller spikelets, thinner empty glumes with 

 the midrib less prominent and less scabrous, and the perfectly smooth flowering 

 glumes. 



Alabama: Coast plain. Low shady banks, borders of woods; in close damp soil. 

 Mobile County. September to October; frequent. Perennial. 



Type locality : "Common in damp places, in thickets and along the borders of 

 Avoods." 



I [erb. Geol. Surv. Herb. Mohr. 



Agrostis altissima (Walt.) Tuckerm. Am. Joiirn. Sci. 45:44. 1843. 



Tall Bent Grass. 



Corniicoptae altissima Walt. Yl. Car. 74. 1788. 



J(iroslis data Trin. Mem. Acad. St. Petersb. ser. 6, pt. 2 : 364. 184.5. 



Trichoilinm elatum Pursh, Fl. Am. Sept. 1 :6l. 1814. 



Gray, Man. ed. 6, 648. Chap. Fl. 551. Wats. Bot. Calif. 2 : 274. 



Allegheniau, Carolinian, and Louisianian areas. New England and New York to 

 North Carolina; California. 



Alaijajia : Low shaded banks and borders of swamps. Mobile County, October; 

 infre(£uent. 



Type locality : South Carolina. 



Herb. Geol. Surv. Herb. Mohr. 



CALAMAGROSTIS Adans. Fam. PI. 2 : 31. 1763. 



About 120 species, temi)erate zone; North America, 31 species. 



Calamagrostis cinnoides (Muhl.) Scribner, Mem. Torr. Club, 5 :42. 1894. 



Reed Bent Grass. 



Arimdo cinnoides Muhl. Gram. 187. 1817. 



Calamafjrostis uuttalliana Steud. Syn. PI. Gram. 190. 1855. 



Gray, Man. ed. 6, 650. Chap. FL 553. Scribner, Grass. Tenn. 2 : 80, t. 27, f. 105. 



Allegheniau and Carolinian areas. New England, Pennsylvania, New Jersey to 

 North Carolina and eastern Tennessee. 



Alabama: Tennessee Valley. Mountain region. Lower hills. Moist woodlands. 

 Cullman, Lauderdale, and Tuscaloosa counties. June, July ; not common. Perennial. 



Type locality : " Hab. locia siccis et sphagnosis, floret Augusto. Penns. Massachuss." 



Herb. Geol. Surv. Herb. Mohr. 



HOLCUS L. Sp. PI. 2:1048. 1753, 



Low annuals. Eight species. Temperate regions, Europe, Africa. 

 Holcus lanatus L. Sp. PI. 2 : 1048. 1753. Velvet Grass. 



Grav, Man. ed. 6, 652. Wats. Bot. Calif. 2:299. Scribner, Grass. Tenn. 2:81, t. 

 27, f. 106. 



Introduced from Europe. Naturalized from Canada to the Gulf, and in California 

 and Mexico. 



Alabama: Adventive with grass seed. Mobile County: escaped from cultivation. 

 Cullman County. May; infrequent. Perennial. 



Type locality : " Hab. in Europae pascuis areuosis."' 



Economic uses: Of some value for hay or pasture on jioor land. 



Herb. Geol. Surv. Herb. Mohr. 



AIRA 1.. Sp. PI. 1:63. 1753. 



Six species; Europe and North Africa. 

 Aira caryophyllea L. Sp. PI. 1 : 66. 17.53. Silvkkv IIajk Grass. 



Gray, Man. ed. 6, 653. 



Europe, North Africa, Chile. 



Naturalized. Ontario, Vancouvers Island; New England to New Jersey, and 

 Tennessee. 



Alabama: Dry pastures and openings in the woods. Rather local; extensively 

 spreading of late years. Abundant where it occurs. Cullman County. Lee County, 

 Anhnrn ( Baker iSEarle). Mobile County, Springhill. April. Annual. 



Type locality: "Hab. in Angliae, Germaniae, Galliae, glareosis."' 



Herb. Geol. Surv. Herb. Mohr. 



