HITCHCOCK—MEXICAN GRASSES. 223 
Rance: Central and southern United States to central Mexico. 
HERBARIUM SPECIMENS FROM MEXIco: 
CurmuaHuA: Chihuahua, hills and plains, Pringle 489; rocky hill, Hitchcock 7992. 
Coanurta: Sabinas, Nelson 6822. 
Nuevo Leon: Monterey, agave field, Hitchcock 5527. 
San Luis Potosi: Cardenas, railway cut, Hitchcock 5732. Sierra de Guascama, 
Purpus 5430. 
30. ECHINOLAENA Desv. Journ. de Bot. 1: 75. 1813. 
1. Echinolaena polystachya H. B. K. Nov. Gen. & Sp. 1: 119. 1816. 
Panicum uncinatum Raddi, Agrost. Bras. 41. 1823. 
Type locality, ‘‘in ripa fluminis Magdalenae inter Tenerife et Zambrano,’’ Colombia. 
RanGeE: American tropics. 
HERBARIUM SPECIMENS FROM Mexico: 
Veracruz: Cordoba, shady rich loam under coffee trees, Hitchcock 6438; banks 
of rivers, Seaton 432. Jalapa, railway cut through jungle, Hitchcock 6641. 
Along railway near Coatepec, Hitchcock 6664. Potrero de San Sebastian, 
Inebmann 396. Zacuapan, Barranca de Tenampa, moist banks, Purpus 1999. 
Oaxaca: Comaltepec, Galeotti 5857. 
31. ERIOCHLOA H. B. K. Nov. Gen. & Sp. 1: 94. pl. 80, 31. 1816. 
\ KEY TO THE SPECIES. 
Fruit Dearing an awn nearly as long as the fertile lemma........-. 1. E. punctata, 
Fruit mucronate or short-awned. 
Blades smooth or nearly so; hairs of pedicels not conspicuous. 
Second glume tapering into an awn about as long as the 
body; spikelet exclusive of awn about 5 mm. long.. 3. £. aristata. 
Second glume acute or short-awned; spikelet about 4 mm. 
long. ...-.222 22 eee eee eee eee 2. EH. polystachya. 
Blades velvety; hairs of pedicels conspicuous, as long as spike- 
let. 
'pikelets 4 mm. long. .............---.---------------- 4. Ei. lemmoni. 
(vixetet 6mm. long.......... eee eee cece cece ee eeee 5. E. nelsoni. 
1. Erio hloa punctata (L.) Hamilt. Prodr. Fl. Ind. Oce. 5. 1825. 
Miliu punctatum L. Syst. Nat. ed. 10. 872. 1759. 
Type ocality, Jamaica. 
RanGE: Southern United States to South America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Nvzvo Leon: Monterey, irrigation ditch, Hitchcock 5576. 
VER «cruz: Cérdoba, Hitchcock 6406; low woods along ditch, Hitchcock 6224; low 
ground along railway, Hitchcock 6431. Orizaba, roadside ditch, Hitchcock 
6324, 6341; Botteri 717. 
More os: Valley near Jojutla, Pringle 9605. 
2. Eriochloa polystachya H.B. K. Nov. Gen. & Sp. 1: 95. pl. 31. 1816. 
Type locality, ‘‘in pascuis inundatis prope Guayaquil (Regno Quit.)’’ Ecuador. 
RanGE: Tropics of continental America. 
_ HERBARIUM SPECIMENS FROM Mexico: 
Sonora: South of Nogales, Hitchcock 3627. Llano, along railway, Hitchcock 3522. 
Hermosillo, meadow, Hitchcock 3584. Guaymas, weed in park, Hitchcock 
3571; Palmer 44 in 1887. Yaqui River, Palmer 4 in 1869. 
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