54 CONTEIBUTIONS FROM THE NATIONAL HEEBAEIUM. 



many miles. It is probably the second most valuable range grass of New Mexico, 

 being an excellent forage plant, very persistent, and not easily killed by overstocking. 



12. VALOTA Adans. 



Tufted perennials with flat leaves and narrow or contracted, densely hairy pani- 

 cles; spikelets numerous, articulated below the glumes, 1-flowered; glumes mem- 

 branous, densely silky-pilose or long-ciliate on the margins, often acuminate, some- 

 times with a short bristle at the apex; lemma chartaceous, glabrous and shining, 

 finally indurated; stamens 3; styles distinct. 



1. Valota saccharata (Buckl.) Chase, Proc. Biol. Soc. Washington 19: 188. 1906. 



Fanicum lachnanihum Torr. U. S. Rep. Expl. Miss. Pacif. 7^: 21. 1856, not Hochst. 

 1855. 



Panicum saccharatum Buckl. Prel. Rep. Geol. Agr. Surv. Tex. App. 2. 1866. 



Trichachne saccharatum Nash in Small, Fl. Southeast. U. S. 83. 1903. 



Type locality: "Middle Texas." 



Range: Colorado and Texas to Arizona and Mexico. 



New Mexico: Albuquerque; Mangas Springs; Black Range; Dog Spring; Dona 

 Ana and Organ Mountains; Causey. Dry hills and plains, in the Lower and Upper 

 Sonoran zones. 



13. SYNTHERISMA Walt. 



Annuals with branched culms, tliin flat leaves, and subdigitate inflorescence; 

 spikelets 1-flowered, lanceolate-elliptic, sessile or short-pediceled, solitary or in 2's 

 and 3's in 2 rows on one side of a continuous, naiTow or winged rachis, forming slender 

 racemes, these aggregated toward the top of the culm; glumes 1 to 3-nerved, the first 

 sometimes obsolete; sterile lemma 5-nerved, the fertile indurated, papillose-striate, 

 with a hyaline margin. 



1. Syntherisma sanguinale (L.) Dulac, Fl. Haut. P5T. 77. 1867. Crabgrass. 



Panicum sanguinale L. Sp. PI. 57. 1753. 



Digilaria sanguinalis Scop. Fl. Cam. ed. 2. 1: 52. 1772. 



Type locality: "Habitat in America, Europa australi." 



Range: Cultivated and waste grounds in nearly all parts of the United States, 

 introduced from Europe. 



New Mexico: Galisteo; Animas Creek; Deming; Mesilla Valley; Guadalupe 

 Mountains. 



14. LEPTOLOMA Chase. 



Tufted perennials with flat leaves and diffuse terminal panicles, these breaking 

 away at maturity and becoming "tumbleweeds;" spikelets 1-flowered, fusiform, 

 solitary on long capillary pedicels; first glume obsolete or minute, the second 3-nerved, 

 nearly as long as the 5 to 7-nerved sterile lemma; fertile lemma indurated, papillose, 

 with a hyaUne margin, this not inrolled; grain free. 



1. Leptoloma cognatum (Schult.) Chase, Proc. Biol. Soc. Washington 19: 92. 1906. 



Fall witch grass. 



Panicum cognatum Schult. Mant. 2: 235. 1824. 



Panicum autumnale Bosc; Spreng. Syst. Veg. 1: 320. 1825. 



Type locality: "In Carolina." 



Range: New Hampshire and Florida to Minnesota, New Mexico, and Mexico. 



New Mexico: Organ Mountains; Knowles; Buchanan; Tortugas Mountain; 

 Roswell. Dry soil, in the Lower and Upper Sonoran zones. 



15. ERIOCHLOA H. B. K. 



Annuals or perennials with usually flat leaves and terminal panicles composed of 

 numerous somewhat one-sided racemes; spikelets 1-flowered, hermaphrodite; rachilla 

 jointed below the glumes and expanded into a distinct ringlike callus; glumes 2, the 



