WOOTON AND STANDLEY FLORA OF NEW MEXICO. 59 



16. Panicum bulbosum H. B. K. Nov. Gen. & Sp. 1: 99. 1815. 



Panicum maximum bulbosum Yasey in Wheeler, Rep. U. S. Surv. lOOtli Merid. G: 

 295. 1878. 



Type locality: "Crescit in Novae Hispaniae scopulosis et frigiclis juxta Santa 

 Rosa, Los Joares et Guanaxuato, inter 1,070 et 1,3G0 hexap." 



Range: Arizona and New Mexico to Mexico. 



New Mexico: Las Vegas; Carpenter Creek; Animas Valley; Burro Mountains; 

 Copper Mines; Organ Mountains; West Fork of the Gila; Ruidoso Creek. Canyons 

 and open slopes, in the Upper Sonoran Zone. 



16a. Panicum bulbosum sciaphilum (Riipr.) Hitchc. & Chase, Contr. U. S. Nat. 

 Herb. 15: 83. 1910. 



Panicum sciaphilum Rupr.; Foiu-n. Mex. PL 2: 19. 1881. 



Panicum bulbosum minor Vasey, U. S. Dej^t. Agr. Div. Bot. Bull. 8: 38. 1889. 



Type locality: Sierra de Yavesia, Mexico. 



Range: Arizona and New Mexico to Mexico. 



New Mexico: Mangas Springs; Las Vegas; Organ Mountains; Gray. Canyons and 

 low hills, in the LTpper Sonoran Zone. 



18. ECHINOCHLOA Beauv. 



Coarse annuals with compressed sheaths, long flat leaves, and terminal panicles of 

 stout racemes; spikelets 1-flowered, with sometimes a staminate flower below the 

 perfect terminal one, nearly sessile in one-sided racemes; glumes unequal, spiny- 

 hispid, mucronate; sterile lemma similar, awned from the apex, inclosing a hyaline 

 palea; fertile lemma and palea chartaceous, acuminate; margins of the glume inroUed 

 except at the summit. 



key to the species. 



Spikes simple 1. E. colonum. 



Spikes compound. 



Awns about 25 mm. long 2. E. crus-galli. 



Awns 2 mm. long or less 3. E. zelayensis. 



1. Echinochloa colonum (L.) Link, Hort. Berol. 2: 209. 1833. Jungle rice. 

 Panicum colonum. L. Syst. Nat. ed. 10. 870. 1759. 



Type locality: Jamaica. 



Range: Wet ground and cultivated fields, Kansas and Virginia, southward through- 

 out tropical America. 



New Mexico: Deming; Mesilla Valley; Organ Mountains; Gavilan Canyon. Wet 

 ground and cultivated fields, in the Lower and Upper Sonoran zones. 



The subspecies zonalis is a form with transverse purplish bands upon the leaves. 

 It is common with the typical form, and is especially abundant among those plants 

 that have grown in dry soil. Both are frequent as weeds in cultivated ground. 



2. Echinochloa crus-gaUi (L.) Beauv. Ess. Agrost. 53. 1812. Barnyard grass. 

 Panicum crusgalli L. Sp. PL 56. 1753. 



Type locality: "Habitat in Europae et Virginiae cultis." 



Range: In waste ground in the warmer parts of North America, and nearly around 

 the world. 



New Mexico: Cedar Hill; Mangas Springs. 



3. Echinochloa zelayensis (H. B. K.) Schult. Mant. 2: 269. 1824. 

 Oplismenus zelayensis H. B. K. Nov. Gen. & Sp. 1: 108. 1816. 

 Type locality: Near Zelaya, Queretaro, Mexico. 



Range: Southwestern United States to South America. 



New Mexico: Common in waste and cultivated land throughout the State. 



