CIRCULAR No. :».— (Agros. 83.) Issued April 22, 1901. 



United States Department of Agriculture, 



DIVISION OF AGROSTOLOGY. 



[Grass and Forage Plant Investigations.] , 



SOME ARIZONA GRASSES. 



The material ou which the following list of Arizona grasses is based 

 was collected bj' Prof. David Griffiths and Director R. H. Forbes while 

 pursuing their investigations of the forage conditions in Arizona, in 

 cooperation between the Division of Agrostology and the Arizona 

 Agricultural Experiment Station. Unless otherwise stated, the speci- 

 mens cited below were collected by Professor Griffiths during the 

 months of September and October. 1900. — F. Lamson-Scribner. 



TRACHYPOGON SECTJNDTJS (Presl) Scribn. n. comb. {Heterojiogon secundus 

 Pre!<l, Rel. Haenk. 3o5. 1830; Trachypogon montufari Nees Agrost. Bras. 342. 

 1829, not H. B. K. 1815; Trachypogon jjohjmorphus secundus Hack, in DC. Monog. 

 Phan. 6: 326. 1889.) 



Dragoon Mountains, No. 1839; near Pearce, No. 1934. 



Elionurus barbiculmis Hack, in DC. Monog. Phan. 6: 339. 1889. 



Near Pearce, Nn. 19.56. » 



ELIONURUS BARBICULMIS PARVIFLORUS Scribn. var. nov. Sessile spike- 

 lets about 5 mm. long, broader in proportion to its length and less acuminate- 

 pointed than in the species, in which the sessile spikelet is 8-9 mm. long. 



Dragoon Mountains, No. 1849. 



Andropogon contortus L. Sp. PI. 1045. 1753. {Heteroj^ogoii contortus R. & S. 

 Syst. 2: 836. 1817; H. Mrtus Pers.) 



Dragoon Mountains, No. 1844; Vales, No. 1678; near Pearce, No. 1947. 



The first glume of the pedicellate spikelet glabrous or sparingly tuberculate-pilose 

 near the apex. 



Andropogon hirtiflorus feensis (Fourn.) Hack, in DC. Monog. Phan. 6:372. 

 1889. {A. feensis Fourn. Mex. PI. 2: 62. 1881.) 



Dragoon Mountains, No. 1851. 



Andropogon torreyanus Steud. Nom. ed. 2, 1:98. 1840. {A. glnucm Torr., not 

 Muhl.; A. KK ccJk in I i( Irs torreyanus Hack, hi DC. Monog. Phan. 6:495. 1889.) 



Papayo Reservation, without number. 



Sessile spikelet .3-4 mm. long. 



Andropogon leucopogon Nees, Linna^a, 19: 694. 1845. (-1. saccharokles leuco- 

 p<,g<m Hack, in DC. Monog. Phan. 6: 496. 1889.) 



Tombs-tone, No. 1982; Dragoon Mountains, No. 1854; Sulphur Spring Valley, No. 

 1639; Rincon Mountains, No. 1784. 



