366 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
form of South America treated as B. simplex. Indeed, the last is almost a perfect 
match for some of the South American forms. The species has a very wide distribu- 
tion, extending from Colorado southward, its place being taken by B. simplex in 
South America, if indeed the latter is 
distinct. 
In South American specimens the 
spikes are commonly two or more 
at the end of some culms, this 
form thus approaching the genus 
Chloris, This condition is rare in 
North American specimens, if those 
examined and collected are typical, 
but is sometimes found, however, in 
B. procumbens, as shown sparingly by 
Griffiths 9516, collected in the vicinity 
of Prescott, Arizona. 
HERBARIUM SPECIMENS. 
“Arizona: Leiberg 5897, San Francisco 
Mountains. 
CoLorapo: Chase 2569, South Chey- 
enne Canyon; 6500, Pikes Peak 
Region; 5395, Harbert Ranch to 
Wet Canyon, Spanish Peaks. 
Shear 1262, Durango. [Hitchcock 
1771, Manitou. 
MarneE: Parlin 1514, New Brunswick, 
introduced in sheep wool. 
New Mexico: Wooton 2925, Encinada. 
Wooton & Standley 3523, Lincoln 
County; 5049, San Miguel County; 
Fic. 27.—Bouteloua procumbens. a, Spikelet; 6, ¢, 212, Lincoln County. Metcalfe 
lemma and palet of first floret; d, rudiment of sec- 1502, Kingston, 583, Soccoro 
ond floret; e, rudiment of third floret; f, three views County. Baker 90 and 163, 
and cross section of caryopsis. a, Scale 7.5; b-f, scale 
12.5. From Griffiths 7362 Chama, Jones 4348, Grants. 
Urau: Jones 5995, Panguitch. 
Mexico: Pringle 1434, plains of Guerrero; 6450, Pedregal, Valley of Mexico; 13242, 
mesas near Zontecomate, Hidalgo; 11218, Federal District. Palmer 3, Chihua- 
hua; 480, Guadalajara; 176, Alvarez; 332, near Saltillo; 397, 398, Saltillo; 712, 
Durango. Schaffner 1016, 156, San Luis Potosf. 
2. Bouteloua simplex Lag. 
Bouteloua simplex Lag. Var, Cienc, 24: 141. 1805. There is a specimen in the 
herbarium of the Madrid Botanical Garden named Bouteloua simplex by Lagasca. 
Chondrosium humile Beauv, Ess, Agrost. 158. 1812. A name only listed in the index 
and based on Actinochloa humilis, a manuscript name of Willdenow published without 
description on page 41; H. B. K. Nov. Gen. & Sp. 1: 175. pl. 56.1816. The figures 
and description in the last work are sufficient to identify the species. 
Actinochloa humilis Willd.; Roem, & Schult. Syst. Veg. 2: 417. 1817. Based upon 
Chondrosium humile H. B. K. 
Actinochloa simplex Roem, & Schult. Syst. Veg. 2: 418. 1817. Based upon Boute- 
loua simplex Lag. 
