HITCHCOCK — REVISIONS OF NORTH AMERICAN GRASSES. 



137 



Zacatecas: Zacatecas, Hitchcock 7527. 



Aguascalientes: Aguascalientes, Hitchcock 7441, 7489. 



Mexico: Toluca, Hitchcock 6914. 



Michoacan: Z amora, Prinale 8480 . Morelia, Nicolds in 1909. 



Puebla: Puebla, Arsene 5444. 



4. Echinochloa holciformis (H. B. K.) Chase. 



Oplismenus holciformis H. B. K. Nov. Gen. & Sp. 1 : 107. 1816. "Crescit in humidis 

 / Y\^ montanis prope Cijdapecuaro, alt. 970 hexap. (Regno Mexicano.) " A specimen 

 from the type collection has been examined in the Willdenow Herbarium at Berlin. 

 The label reads, "Panicum holciforme. Amer. merid. Humboldt." 



Orthopogon holciformis Spreng. Syst. Veg. 1 : 307. 1825. Based on Oplismenus holci- 

 formis H. B. K. 



Panicum holciforme Steud. Syn. PI. Glum. 1: 48. 1854. Based on Oplismenus 

 holciformis H. B. K. 



Berchtoldia holciformis Fourn. Mex. PI. 2: 41. 1886. Based on Oplismenus holci- 

 formis H. B. K. 



Echinochloa holciformis Chase, Proc. Biol. Soc. Washington 24: 155. 1911. Based 

 on Oplismenus holciformis H. B. K. 



description. 



Plants perennial; culms erect, sometimes with a decumbent rooting base, stout, 

 succulent, as much as 2 meters tall and 1.5 cm. thick at base, glabrous; sheaths 

 glabrous; ligule a dense 

 line of stiff hairs, long on l\ \\ *'l 

 the lower leaves, short on 

 the upper leaves; blades 

 mostly 8 to 15 mm. wide, 

 scabrous on the margins 

 and upper surface; pani- 

 cle dense, or interrupted 

 below, nodding, as much 

 as 40 cm. long, the axis 

 scabrous, densely hispid 

 around the base of the 

 branches; racemes ap- 

 pressed, single or fas- 

 cicled, the lower as much 

 as 10 cm. long, the rachis 

 scabrous and hispid; 

 spikelets rather closely 

 arranged, nearly sessile, 

 about 5 mm. long, fusi- 

 form, grejen or purple, 

 _ only slightly convex On 

 the rounded side; first 

 glume acute or obtuse; 

 second glume short- 

 awned ; sterile lemma 

 empty, the awn as much 



Fig. 28. — Echinochloa holciformis. From Arsene in 1909, Mexico. 



as 5 cm. long; fruit elliptic, about 5 mm. long including the point, this about 1 mm. 

 long. 



DISTRIBUTION. 



Moist places, often covering large areas in shallow water, central Mexico to Guatemala. 

 Durango: Durango, Hitchcock 7611; Palmer 253 in 1896. 

 Jalisco: Orosco, Hitchcock 7375. 



