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: Leiberg5897, San Francisco 



Mountains. 

 Colorado: Chase 2569, South Chey- 

 enne Canyon; 6500, Pikes Peak 

 Region; 5395, Harbert Ranch to 

 Wet Canyon, Spanish Peaks. 

 Shear 1262, Durango. Hitchcock 

 1771, Manitou. 

 Maine : Parlin 1514, New Brunswick, 



introduced in sheep wool. 

 New Mexico: Wooton 2925, Encinada. 

 Wooton 6c Standley 3523, Lincoln 

 County; 5049, San Miguel County ; 

 212, Lincoln County. Metcalfe 

 1502, Kingston, 583, Soccoro 

 County. Baker 90 and 163, 

 Chama. Jones 4348, Grants. 

 Utah: 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 Potosi. 



2. Bouteloua simplex Lag. 



Boutcloua simplex Lag. Var. Cienc. 2 4 : 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. pi. 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. 



Fig. 27.— Bouteloua procumbens. a, Spikelet; 6, c, 

 lemma and palet of first floret; d, rudiment of sec- 

 ond floret; e, rudiment of third floret;/, three views 

 and cross section of caryopsis. a, Scale 7.5; b-f, scale 

 12.5. From Griffiths 7302. 



