MANUAL OF THE GKASSES OF THE UNITED STATES 929 



Poa dinantha Wood, Class-book 797. 1861. Montgomery Ala. 

 This species was described as Poa nemoralis L., in Torr., Fl. North, and Mid. 

 U.S. 1: 111. 1823. n _ . „ D __ 



(64) Poa ampla Merr., Rhodora 4: 145. 1902. Steptoe, Wash., G. R. Vasey 

 3009 

 Poa laeviculmis Williams, Bot. Gaz. 36: 55. 1903. Several specimens from 

 Washington and Oregon mentioned, the first being Steptoe, Wash., G. R. 

 Vasey 3026. „ _ 



Poa truncata Rvdb., Bull. Torrey Bot. Club 32: 607. 1905. Dillon, Colo., 



Clements 373.' 

 Poa confusa Rydb., Bull. Torrey Bot. Club. 32 : 607. 1905. Medicine Bow 

 Mountains, Wvo., Nelson 7787. 

 (5) Poa annua L., Sp. PL 68. 1753. Europe. 



Aira pumila Pursh, FL Amer. Sept. 1: 76. 1814. Pennsylvania. 



Poa infirma H.B.K., Nov. Gen. and Sp. 1: 158. 1816. Colombia, Humboldt 



and Bo upland. 

 Megastachya infirma Roem. and Schult., Syst. Veg. 2: 585. 1817. Based on 



Poa infirma H.B.K. 

 Catabrosa pumila Roem. and Schult., Syst, Veg. 2: 696. 1817. Based on Aira 



pumila Pursh. 

 Poa aestivalis Presl, Rel. Haenk. 1: 272. 1830. Peru, Haenke. 

 Eragrostis infirma Steud., Nom. Bot, ed. 2. 1: 563, 1840. Based on Poa 



infirma H.B.K. 

 Poa annua var. rigidiuscula L. H. Dewey, Contrib. U.S. Natl. Herb. 3: 262. 

 1895. Nez Perce County, Idaho, Sandherg 134. 

 (7) Poa arachnifera Torr., in Marcy, Expl. Red Riv. 301. 1853. Headwaters of 

 the Trinity River [Ark., Marcy Exped.]. 

 Poa densi flora BuckL, Acad. Nat. Sci. Phila. Proc. 1862: 96. 1863. Northern 



Texas. 

 Poa arachnifera var. glabrata Vasey, Descr. Cat, Grasses L T .S. 79. 1885, name 

 onlv, [for staminate plants with glabrous spikelets]; Vasev; Beal, Grasses 

 N.Amer. 2: 535. 1896. [Texas, Buckley in 1881.] 

 Poa glabrescens Nash, in Small, Fl. Southeast. U.S. 154, 1327. 1903. Based 

 on P. arachnifera var. glabrata Torr. (error for Vasev). 

 (21) Poa arctica R. Br., Sup. App. Parry's Voy. 288 '(err. typ. 188). 1823. 

 Melville Island, Arctic America, Parry. 

 Poa grayana Vasey, Contrib. U.S. Natl. Herb. 1: 272. 1893. Gravs Peak, 



Colo., Patterson 14 in 1885. 

 Poa laxa occidentalis Vasev; Rvdb. and Shear, U.S.Dept.Agr., Div. Agrost. 

 Bull. 5: 32. 1897. Name onlv, for Shear 690 and Rydberg 2440, Gravs 

 Peak, Colo. 

 Poa longipila Nash, in Rydb., Mem. N.Y. Bot. Gard. 1:46. 1900. Electric 



Peak, Yellowstone Park, Rydberg 3614. 

 Poa alpicola Nash, in Rydb., Mem. N.Y. Bot. Gard. 1:47. 1900. Based on 

 P. laxa Haenke as misapplied bv Thurber (in W^atson, Bot. Calif. 2: 312. 

 1880). 

 Poa williamsii Nash, Bull. N.Y. Bot, Gard. 2: 156. 1901. White Pass, 



Alaska, Williams in 1899. 

 Poa aperta Scribn. and Merr., U.S.Dept.Agr., Div. Agrost, Circ. 35: 4. 1901. 



TeUuride, Colo., Shear 98. 

 Poa callichroa Rydb., Bull. Torrey Bot. Club. 32: 603. 1905. Dead Lake, 



near Pikes Peak, Colo., Clements 457. 

 Poa phoenicea Rydb., Bull. Torrey Bot. Club 32: 605. 1905. Pikes Peak 



Vallev, Colo., Clements 466. 

 Poa tricholepis Rvdb., Bull. Torrev Bot. Club 32: 606. 1905. Pagosa Peak, 



Colo., Baker 210. 

 Poa chionogenes Gandog., Bull. Soc. Bot. France 66 7 : 302. 1920. Gravs 



Peak, Colo., Crandall [in 1898]. 

 Colorado specimens of this species have been described as Poa cenisia All. by 

 some recent American authors. 



(19) Poa arida Vasev, Contrib. U.S. Natl. Herb. 1: 270. 1893. Socorro, N. 

 Mex., G. R. Vasey in 1881. 

 Poa andina Nutt.; S. Wats., in King, Geol. Expl. 40th Par. 388. 1871. Not 

 P. andina Trim, 1836. "Colorado, East and West Humboldt Mountains 

 and in Clover Mountains, Nevada; also in the Trinity Mountains, Watson 

 1319." The name is given as P. andina "Nutt., Ms. in Herb.; (not of Triii.).' 



