Andropog-on halepensis (L. ) Brot. Fl. Lusit. 1: 89. 1804. 



University grountl.«, Tucson, Xo. 1533. 



Nazia aliena (Spreng.) Scribn. U. S. Dept. Agr. Div. Agros. Bui. 17: 28, fig. 



324. 1899. (Lappago aliena Spreng. Neue Entd. 3:15. 1822.) Western 



prickle-grass. 

 Near Pearce, Xo. 1952; Benson, Xo. 1832. 

 Nazia racemosa (L.) Kuntze, Rev. Gen. PI. 3': 357. 1898. {Cenchrus racemosus 



L. Sp. PI. 1049. 1753; Lappago rncemosn Honck. Syn. 1: 440.) Prickle-grass. 

 University grounds, Tucson. 

 Hilaria jamesii (Torr. ) Benth. Journ. Linn. Soc. 19:62. 1881. {Pleuraphis 



Janu'si) Torr. Ann. Lye. X. Y. 1: 148, t. 10. 1824.) Black bunch-grass. 

 Sulphur Spring Valley, Xo. 1647, R. H. Forbes. 

 Hilaria mutica (Buckl. ) Benth. Journ. Linn. Soc. 19:62. 1881. {Pleuraphis 



mutica Buckl. Proc. Acad. Xat. Sci. Phil. 1862: 95. 1862.) Black grama. 

 Benson, No. 1998; Vales, Xo. 1679. The margins of the outer glumes densely fringed 



with short silky hairs, prominent nerves of the broad outer glumes three, 



diverging above as in the type, which, however, has 5-7 nerves in the outer 



glumes. 

 Sulphur Spring Valley, Xo. 1647. In this specimen the outer glumes of the stami- 



uate spikelets are about 6 mm. long, oblong, obtuse or subacute; nerves 3-5, 



running nearly parallel. The shape of the glumes ap])roaches those of H. 



jamesii, but the size of the spikelets and character of the pubescence at the base 



of the group are those of H. mutica. 

 Hilaria cencliroides H. B. K. Xov. Gen. et Sp. PI. 1:117, t. 37. 1815. Curly 



mesquite. 

 Tucson, Xo. 1534; Rincou Mountains, X^o. 1583; Cochise, Xo. 1883. 



Paspalum distichum Linn. Amcen. Acad. 5:391. 1759. Knot-grass. 



Tucson, Xo. 610. 



Eriochloa aristata Vasey, Bui. Torr. Bot. Club, 13: 229. 1886. 



University grounds, Tucson, X^os. 1612, 1546. Xot previously reported from the 



United States. Introduced from Mexico. 

 Eriochloa annulata (Fliigge) Kunth, Rev. Gram. 1:30. 1835. {Pasjyalus annu- 



lafus Fliigge, Monog. 135. 1810; Helopus annulatus Xees, Agrost. Bras. 17. 



1829— Doell in Mart. Fl. Bras. 2^: 124, t. 19. 1871-1877.) 

 University grounds, Tucson, September 5, 1900, Xo. 1516. 

 This distinct and widely distributed species has not previously l)een reported from 



the United States, probably introduced. It is represented in the U. S. National 



Herbarium by specimens from Cuba, Australia, and India. 

 Eriochloa punctata (L.) W. Hamilt. Prodr. PI. Ind. Occ. 5. 1825. 

 University grounds, Tucson, No. 1537; Benson, No. 2002. 

 Eriochloa punctata minor Vasey, Contr. U. S. Nat. Herb. 3: 21. 1892. 

 Sulphur Spring Valley, R. H. Forbes, October, 1900, Xo. 1641. 



PANICTJM ARIZONICUM Scril)n. & Merrill sp. nov. [Panicum (sine nomine) 

 Scribn. Bui. Torr. Bot. Club, 9: 76. 1882; P. fasciculatum dissitiflonun Vasey, in 

 herb. 'Sot P. di.mfiflorum Steud. 1841.) 



A tufted, nearly glabrous perennial (?) 3 to 6 dm. high, with narrowly lanceolate 

 leaves, open panicles, and pubescent spikelets. Culms prostrate below and root- 

 ing at the lower nodes, glabrous except just below the panicle, as are the numer- 

 ous branches; nodes glabrous. Sheaths shorter than the internodes, smooth, 

 rather loose; ligule about 1 mm. long, ciliate; leaf-blades 8 to 15 cm. long, 5 to 

 8 mm. wide, cordate and clasping at the base, gradually tapering to the acumi- 

 nate apex, thin, but tirm, minutely serrulate-scabrous on the promment, carti- 



