HITCHCOCK—-MEXICAN GRASSES. >» CR 
Sheaths scabrous. 
Panicle open, the lower branches 
spreading, naked below. ..---- 10. P. strictiramea. 
Panicle narrow, the branches short, 
spikelet-bearing at base. 
Lemmas smooth; spikelets 1 cm. 
long; blades firm, the 
uppermost reduced to a 
point......-..------------ ll. P. griffithsi. 
Lemmas scaberulous; spikelets 5 
to 8 mm. long; blades lax, 
«the uppermost evident, 2 
cm, or more long....------ 12. P. scabrella. 
1. Poa annua L. Sp. Pl. 68. 1753. 
Poa infirma H. B. K. Nov. Gen. & Sp. 1: 158. 1816. 
Type locality, ‘in Europa” [Sweden]. 
Range: Throughout the cold and temperate regions of the northern hemisphere. - 
HERBARIUM SPECIMENS FROM MEXICco: 
Caravanvua: Chihuahua, Palmer 28 in 1908. 
Duranco: San Ramén, Palmer 71 in 1906. Nombre de Dios, common along 
ditches in the town, Palmer 97 in 1896. 
CoaHUILA: Saltillo, Palmer 711 in 1905; wet irrigation ditch, Hitchcock 5601. 
Nuevo Leon: Monterey, Palmer 1365 in 1880. 
ZACATECAS: Plateado, Rose 2712. Zacatecas, along dry river bed, Hitchcock 7530. 
San Luts Porosi: Alvarez, Palmer 173 in 1902. San Luis Potosi, park, Hitch- 
cock 5706. C&rdenas, along irrigation ditch, Hitchcock 5745. 
Jauisco: Nevado de Colima, open ground, Hitchcock 7154. Guadalajara, Palmer 
483 in 1886. 
QUERETARO: Querétaro, irrigation ditch, Hitchcock 5829. 
Hrpaiao: Pachuca, near small pond, Hitchcock 6747. 
México: Ixtaccihuatl, rocks above timber line, Purpus 1618. Popocatepetl, 
common in open places in woods up to near timber line, Hitchcock 5992; Rose 
& Hay 6246. Toluca, along ditch, Hitchcock 6913. El Oro, woods, Pringle 
9589. Federal District, along ditch in shade, Hitchcock 5929; Holway 3218. 
Pursia: Chalchicomula, along road, Hitchcock 6280; field, Hitchcock 6292. 
Tehuacin, along ditch, Hitchcock 6049. . 
Veracruz: Boca del Monte, Nelson 219. Jalapa, along street, Hitchcock 6625. 
More os: El Parque, Orcutt 3858. 
Oaxaca: Oaxaca, wet soil, Pringle 4671. 
2. Poa bigelovii Vasey & Scribn. in Vasey, Descr. Cat. Grasses U. S. 81. 1885. 
Type locality, ‘‘Banks of the Rillita,”’ Arizona, the type specimen collected by 
Pringle. 
Rance: Southwestern United States and northern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Cauirornia: El Rancho Viejo, Brandegee 24 in 1889. 
Curmuanua: Paso del Norte, Vasey in 1881. 
Coanvuita: Saltillo, Palmer 532 in 1905. 
Nuevo Leon: Sierra Madre above Monterey, Pringle 13748. Monterey, Palmer 
1365 in 1880. 
8. Poa pratensis L. Sp. Pl. 67. 1753. KENTUCKY BLUE GRASS. 
Type locality, Sweden. 
Rance: Throughout temperate and colder parts of North America and Eurasia. 
