372 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



found them growing intermixed. This still further goes to prove the close relationship 

 of the two species and really throws a doubt upon the validity of B. hirticulmis. My 

 own collection from western Jalisco illustrates the same close relationship. Indeed, 

 frequent gradations may be found between this and B. hirsuta in the mountains north- 

 west of Guadalajara. In the vicinity of Aguascalientes the species has less hairy 

 culms, as shown by some of my own distributions. Further collections from the 

 Pacific coast of Mexico, from Lower California to the Isthmus are necessary. 



HERBARIUM SPECIMENS. 



Mexico, Brandegee, El Tase, Lower California. Nelson 3121 (in part), Chiapas; 1259, 

 Valley of Oaxaca. Palmer 201, Rio Blanco, Jalisco. 



6. Bouteloua hirsuta Lag. 



Bouteloua hirsuta Lag. Var. Cienc. 2 4 : 141. 1805. My interpretation of this i8 

 based upon the description and upon a specimen sent by Lagasca to Munich in 1820. 

 A specimen in the herbarium of the Madrid Botanical Garden marked B. hirsuta in 

 Lagasca's hand has both B. hirsuta and B. gracilis on the same sheet. This, however, 

 is not the type, for that was burned in Lagasca's first herbarium. The spike of 

 B. hirsuta from this specimen before me is very large and represents the largest of our 

 southern forms of this species. The Munich and Madrid specimens appear to be from 

 the same collection. See also U. S. Dept. Agr. Div. Bot. Bull. 12 l : pi. 39. f. 1-3. 

 1890; Britt. & Brown, Illust. Fl. 1 :180./. All. 1896; U. S. Dept. Agr. Div. Agrost. 

 7: 223./. 205. 1897. 



Bouteloua hirta "H. R. M."o Lag. Var. Cienc. 2 4 :141. 1805. A garden name 

 mentioned as a synonym of Bouteloua hirsuta; B. hirta Scribn.& is based on Chon- 

 drosium hirtum H. B. K. 



Chondrosium hirtum H. B. K. Nov. Gen. & Sp. 1 : 176. pi. 59. 1816. The plate 

 identifies this without doubt, although the species normally bears 2 to 4 spikes, not 

 one spike as figured and described. 



Actinochloa hirsuta Roem. & Schult. Syst. Veg. 2 : 419. 1817. Based upon Bou- 

 teloua hirsuta Lag. 



Eutriana hirta Trin. Gram. Unifl. 240. 1824. Based upon Actinochloa hirsuta Roem. 

 & Schult. 



Atheropogon hirtus Spreng. Syst. Veg. 1 : 293. 1825. Based upon Chondrosium 

 hirtum H. B. K. 

 * Chondrosium hirsutum Sweet, Hort. Brit. 1 : 455. 1826. A name only. 



Atheropogon papillosus Engelm. Amer. Journ. Sci. 46: 104. 1843. The descrip- 

 tion is sufficient to identify this. The type, in the Engelmann Herbarium, is Geyer's 

 specimen collected near Beardstown, Illinois, in 1842. A specimen so named cor- 

 responding to this description in the Gray Herbarium further identifies it. This is 

 mounted on the same sheet as Mead's specimen from Mason County, Illinois, collected 

 August 25, 1845. 



Chondrosium aschenbornianum Nees, Linnaea 19 : 692. 1847. The type is Aschen- 

 born Exsic. no. 331. The specimen of this in Willdenow's herbarium is Bouteloua 

 hirsuta. Fournier has listed many numbers from Mexican collectors under this name 

 but all others examined from whatever source are B. gracilis. As an illustration of the 

 mix up, my notes on Bourgeau's no. 448 are interesting. In the National Herbarium 

 B. gracilis and B. hirsuta are found under this number on the same sheet. In the 

 Gray Herbarium, and the herbaria at Paris and at the St. Petersburg Botanical Garden, 

 this number is B. gracilis, while a duplicate of the type in the Willdenow Herbarium 

 is B. hirsuta. 



a I. e., Hortus Regius Matritensis. &Contr. Nat. Herb. 2 : 531. 1894. 



