884 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
RanaeE: Introduced in the United States, adventive in Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Msxico: Popo Park, escaped, along road, Hitchcock 6022. 
Pursta: Near Puebla, waste ground, Arséne in 1907. 
125. JOUVEA Fourn. Bull. Soc. Bot. Belg. 15: 475. 1876. 
KEY TO THE SPECIES. 
Blades mostly flat, rather lax; culms slender, erect; pistillate spike 
slender, 1 mm. in diameter............-------++-------++-5+- 1. J. straminea. 
Blades folded, thick and firm, pungently pointed; culms spreading; 
pistillate spike conical, about 4 mm. in diameter at base.... 2. J. pilosa. 
1. Jouvea straminea Fourn. Bull. Soc. Bot. Belg. 15: 475. 1876. 
Type locality, ‘‘In arena littorali maris Pacifici prope San Angustin,”’ the type 
specimen collected by Liebmann. 
RANGE: Pacific coast of southern Mexico and Central America. 
HERBARIUM SPECIMENS FROM MEXICco: 
Guerrero: Acapulco, Palmer 443 in 1895. 
Oaxaca: Playa de San Angustfn, sandy shore of Pacific Ocean, Liebmann 738. 
2. Jouvea pilosa (Presl) Scribn. Bull. Torrey Club 23: 143. 1896. 
Brizopyrum pilosum Presl, Rel. Haenk. 1: 280. 1830. 
Type locality, ‘‘in Acapulco.” 
Rance: Pacific coast from Lower California to Salvador. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Cauirornia: Cape St. Lucas, Xantus 121. San José del Cabo, Purpus. 
529; Brandegee 42 in 1890, 43 in 1899, September, 1893, October, 1902. La 
Paz, Palmer 124. 
Sinatoa: Mazatlan, Rose, Standley & Russell 14018. Altata, Rose, Standley & 
Russell 14832. 
Trpic: Marfa Madre Island, Maltby 71. 
Cotma: Socorro Island, Barkelew 183. Manzanillo, Palmer 1384 in 1891. 
Guerrero: Acapulco, Palmer 235 in 1895, 4434 in 1895. 
Oaxaca: San Angustin, Liebmann 479. Santa Cruz, Liebmann 480. 
126. AGROPYRON Beauv. Ess. Agrost. 101. pl. 20. f. 1, 2. 1812. 
WHEAT GRASS. 
KEY TO THE SPECIES. 
Lemmas awned, the awn longer than the lemma, spreading. ..-..- 3. A. arizonicum. 
Lemmas awnless or with short straight awns. 
Plants producing rhizomes...........-.------+--+++++-2ee2eee- 1. A. repens. 
Plants without rhizomes......--.-...---------0-+--2-2 0202 2. A. tenerum. 
1. Agropyron repens (L.) Beauv. Ess. Agrost. 102, 146. 1812. QUACK GRASS. 
Triticum repens L. Sp. Pl. 86. 1753. 
Type locality, Europe [Sweden]. 
Ranae: Introduced from Europe; weed in the eastern United States, rare on the 
Pacific coast and in Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Curnuanua: Sdnchez, Hitchcock 7706. 
Duranao: Otinapa, Palmer 347 in 1906. 
Hipauco: Cuyamboya, Pringle 13432. Pachuca, sandy river bed, Hitchcock 
6769. 
Puesia: Chalchicomula, along railway, Hitchcock 6306. 
