HITCHCOCK—MEXICAN GRASSES. 885 
2. Agropyrum tenerum Vasey, Bot. Gaz. 10: 258. 1885. 
Type locality, ‘‘Rocky Mountains.”’ 
RanGE: Labrador to Alaska and southward to northern Mexico. 
HERBARIUM SPECIMENS FROM MExIco: 
Lower Cauirornta: Las Juntas, Orcutt 1163. Without locality, Orcutt in 1889. 
Curmmuanua: Colonia Garcfa, meadow valley, Townsend & Barber 328. 
3. Agropyron arizonicum Scribn. & Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 
4: 27. 1897. 
Type locality, ‘‘In the mountains of * * * Arizona.’’ 
RanGE: Southwestern United States and northern Mexico. 
HERBARIUM SPECIMENS FROM MExIco: 
Curmuanua: Sierra Madre, Nelson 6495a; cool ledges, Pringle 1439. Colonia 
Garcia, Townsend & Barber 337. SAénchez, Hitchcock 7711. Canyon de San 
Diego, Hartman 805. 
127. HORDEUM L. Sp. PI. 84. 1753. 
BaRLEY. WILD BARLEY. Foxtatu. 
KEY TO THE SPECIES. 
Plants perennial; awns an inch long or more; lateral spikelets reduced 
to slender awns............2.....eceeeeee eee eee wee eeeeee 1. H. jubatum, 
Plants annual; some of the glumes dilated. 
Glumes, or some of them, ciliate...............22.2.2....0000- 3. H. murinum. 
Glumes not ciliate.......... 2.0.0.0. c eee eee ee ee ee eee 2. H. pusillum. 
1. Hordeum jubatum L. Sp. Pl. 85. 1753. 
Hordeum adscensionis H. B. K. Nov. Gen. & Sp. 1: 180. 1816. 
Type locality, ‘‘in Canada,” the type specimen collected by Kalm. 
RANGE: Ontario to Alaska and southward, adventive in Mexico. 
HERBARIUM SPECIMENS FROM MEXIco: 
México: Federal District, along trolley, Xochimilco, Hitchcock 5873, 5877; Orcutt 
4101. 
2. Hordeum pusillum Nutt. Gen. Pl. 1: 87. 1818. 
Type locality,’‘‘On the arid and saline plains of the Missouri.” 
RanGE: Middle and western United States to northern Mexico. 
HERBARIUM SPECIMENS FROM MExIco: 
Cuinuanua: Sanchez, along railway, Hitchcock 7694. 
8. Hordeum murinum L. Sp. PI. 85. 1753. 
Type locality, Europe [Sweden]. 
RanGE: Pacific slope from Idaho to Vancouver Island and south into Lower Cali- 
fornia; introduced from Europe. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Cauirornia: Guadalupe Island, Palmer 671 in 1889. Nachognero Val- 
ley, Schoenfeldt 3449. 
128. ELYMUS L. Sp. Pl. 83. 1753. 
WILD RYE. 
KEY TO THE SPECIES. 
Plants producing rhizomes; awn shorter than the lemma or none. 1. E. triticoides. 
Plants not producing rhizomes; awn longer than the lemmas. 
Glumes subulate, 1 to 2-nerved..................0.2020--00- 2. E. pringlei. 
Glumes lanceolate, 3 to 5-nerved.................2.02c000- 3. £. brachystachyus. 
