HITCHCOCK—MEXICAN GRASSES. 215 
21. AEGOPOGON Humb. & Bonpl. in Willd. Sp. Pl. 4: 899. 1806. 
KEY TO THE SPECIES. 
Glumes lanceolate, entire or sometimes obscurely toothed; pedi- 
celed spikelets rudimentary; awn of perfect spikelet incon- 
spicuous or wanting. .....-.--------e.+eeee- wee e eee e neces 3. A. imperfectus, 
Glumes cuneate, lobed at the summit; pediceled spikelets well 
developed; awns usually as long as the spikelet cluster or 
longer. 
Lobes of glumes rounded, broad and papery......---------- 2. A. tenellus. 
Lobes of glumes acute or awned, firm, purplish. ........-.--- 1. A. cenchroides. 
1. Aegopogon cenchroides Humb. & Bonpl.; Willd. Sp. Pl. 4: 899. 1806. 
Aegopogon geminiflorus H. B. K. Nov. Gen, & Sp, 1: 133, 1816. 
Type locality, ‘‘Cumana,”’ Venezuela. 
Rance: Mexico to Bolivia. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower CALIFORNIA: Saucito, Brandegee 69 in 1893 (type of A. geminiflorus 
breviglumis Scribn.,! A. breviglumis Nash*). Sierra de San Francisquito, 
Brandegee 23 in 1899, 41 in 1890. Sierra de la Laguna, Brandegee 6 in 1890. 
Cummuanva: Sdnchez, rocky hill, Hitchcock 7675. Mapula Mountains, thin soil 
of ledges, Pringle 823. Colonia Garcfa, Townsend & Barber 340. Cation 
de San Diego, Hartman 789. Southwestern Mexico, Palmer 28 in 1885. 
Road between Guadalupe y Calvo and San Julian, Nelson 4926. 
San Luis Porosi: San Luis Potosf, Schaffner 166, Parry & Palmer 942. 
Jauisco: Guadalajara, prairie, Hitchcock 7267; dry banks, Pringle 11731; hills, 
Pringle 3964. Rio Blanco, Palmer 247 in 1886. 
Cotma: Colima, Palmer 1270 in 1891. 
Hmatao: Pachuca, rocky hill, Hitchcock 6720. 
México: Popo Park, shady bank, Hitchcock 5961, 6024. Popocatepetl, bank of 
deep cut, Hitchcock 5976. Ixtaccihuatl, dry slopes, Purpus 48. Federal 
District, Sierra de Ajusco, Pringle 9106; Holway 16. Santa Fé, Bourgeau. 
Moretos: Cuernavaca, along ditch, Hitchcock 6850. 
Puesua: Cholula, Deam in 1899. 
Veracruz: Jalapa, clay cut, Hitchcock 6627. Orizaba, Miiller 2071, Botteri. 
Oaxaca: Oaxaca, Nelson 1367, 1477; Galeotti 5750, 5889 in part. 
Curapas: San Cristébal, Nelson 3227. 
2. Aegopogon tenellus (Cav.) Trin. Gram. Unifl. 164. 1824. 
Lamarckia tenella DC. Hort. Monsp. 120. 1813. 
Cynosurus tenellus Cav.; DC. Hort. Monsp. 120. 1813. 
Hymenothecium unisetum Lag. Gen. & Sp. Nov. 4. 1816. 
Aegopogon unisetus Roem. & Schult. Syst. Veg. 2: 805. 1817. 
Type locality, unknown, the type specimen from the Botanical Garden, Montpelier, 
France.? 
Rance: Southern Arizona and northwestern Mexico to northern South America. 
1 Zoe 4: 386, 1894. 
2N. Amer, Fl. 17: 139. 1912. 
3 Through the kindness of M. C. de Candolle the National Herbarium has received 
a small portion of the type specimen collected in the Hortus M onspeliensis in 1808 by 
A. P.deCandolle. This proves to be the species to which Fournier (Mex, Pl. 2: 71. 
1886) misapplied the name Aegopogon geminiflorus H. B. K. 
