HITCHCOCK—-MEXICAN GRASSES. 973 
Ligule short, about 1 mm. long....................2-2+2+-+-- 2. H. grandiflorus. 
Ligule conspicuous, as much as 1 cm. long ............-..... 3. H. ligularis. 
1. Homalocenchrus hexandrus (Swartz) Kuntze, Rev. Gen. Pl. 2: 777. 1891. 
Leersia hexandra Swartz, Prodr. Veg. Ind. Occ. 21. 1788. 
Type locality, ‘‘Jamaica.”’ 
RanGE: Southern United States, Mexico, and West Indies to South America. 
HERBARIUM SPECIMENS FROM MEXICO. 
Duranao: Durango, in pond, Hitchcock 7570; gravel of dry creek bed, Hitchcock 
7612; Palmer 195 in 1896. 
Jauisco: Guadalajara, Palmer 244 in 1886. Orozco, border of large pond, Hitch- 
cock 7383. 
Guanasuato: Ac&mbaro, along railway, Hitchcock 6929. 
Micuoacdn: Lake PAtzcuaro, shallows, Pringle 3330. 
Mexico: Tlalnepantla, in shallow water, Pringle 11226. 
FrepErat District: Azcapotzalco, water of ditch, Hitchcock 5922. Churubusco, 
Orcutt 4279. 
Puesia: Puebla, Nicolas in 1908 and 1910. 
Veracruz: Cérdoba, in water along railway, Hitchcock 6432. 
MoreELos: Cuernavaca, ditch, Hitchcock 6847. 
Oaxaca: Oaxaca, water of ditch, Hitchcock 6174. 
Tasasco: Atasta, Rovirosa 648. 
2. Homalocenchrus grandiflorus (Doell). 
Oryza monandra var. grandiflora Doell in Mart. Fl. Bras. 2?: 9. 1871. 
Type locality, ‘‘ad Caldas in prov. Minarum,”’ Brazil, the type specimen collected 
by Regnall (no. III. 1402). 
Rance: Veracruz to South America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Veracruz: Mirador, Liebmann 256. Cérdoba, shady bank, Hitchcock 6480. 
3. Homalocenchrus ligularis (Trin.) Kuntze, Rev. Gen. Pl. 2: 777. 1891. 
Leersia ligularis Trin. Mém. Acad. St. Pétersb. VI. Sci. Nat. 3': 168. 1840. 
Type locality, ‘‘Mexico, prope Jalapam, in sylvis montis Macultepec,’’ the type 
specimen collected by Schiede. 
Rance: Veracruz. 
HERBARIUM SPECIMENS: 
Veracruz: Jalapa, rich soil along railway through timber, Hitchcock 6619. Ori- 
zaba, open rocky hill, Hitchcock 6378; in woods near top of rocky hill, Hitch- 
cock 6382. 
57. PHALARIS L. Sp. Pl. 54. 1753. 
KEY TO THE SPECIES. 
Glumes narrowly winged; panicle oblong.........----------+-+-- 1. P. caroliniana. 
Glumes broadly winged; panicle ovate or ovate-oblong. 
Sterile lemma solitary; fertile lemma 3 mm. long............- 2. P. minor. 
Sterile lemmas in pairs; fertile lemma 5 to 6 mm. long........ 3. P. canariensis. 
1. Phalaris caroliniana Walt. Fl. Carol. 74. 1788. 
Type locality, presumably South Carolina. 
Rance: Southern United States to northern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Sonora: Magdalena, Rose, Standley & Rose 15078. 
CuravuaHua: Chihuahua, Palmer 32 in 1908. 
2. Phalaris minor Retz. Obs. Bot. 3: 8. 1783. 
Type locality, East Indies, particular locality not given. 
