GRIFFITHS THE GRAMA GRASSES. 



399 



to 0.5 mm. wide, rounded on the back, the scutellum rounded at the apex and covering 

 two-thirds to three-fourths of the ventral surface. (Figure 50.) 



The only specimens of this species which have been seen are those of the type col- 

 lection. The species is very closely related to B. curtipendula, but is easily distin- 

 guished by the felty-pubescent sheaths and the character of the inflorescence. 



21. Bouteloua chondrosioides (H. B. K.) Griseb. 



Dinebra chondrosioides H. B. K. Nov. Gen. & Sp. 1 : 173. pi. 53. 1816. The figures 

 and description and a specimen in the Willdenow Herbarium, collected by Humboldt, 

 show conclusively that this is a young plant of what we have long known in this coun- 

 try as B. havardii. There is another specimen in the Trinius Herbarium from Hum- 

 boldt, determined by Kunth in 1836. The figures cited above are faulty in that they 

 do not show the glumes as hairy as they are. 



Bouteloua ovata Lag. Gen. & Sp. Nov. 5. 1816. Lagasca's description, "culmo 

 subpentastachyo: spicis ovatis: glumis 

 extus pubescentibus," applies very well 

 to a young specimen of B. havardii such 

 as the type of Dinebra chondrosioides. 

 This, together with the fact that some 

 of the earlier botanists have suggested 

 that the two names apply to the same 

 species, leads me to this disposition. 



Atheropogon chondrosioides Roem. & 

 Schult. Syst. Veg. 2 : 416. 1817. Based 

 upon Dinebra chondrosioides H. B. K. 

 See also Spreng. Syst. Veg. 1 : 293. 1825. 



Actinochloa ovata Roem. & Schult. 

 Syst. Veg. 2: 420. 1817. Based on 

 Bouteloua ovata Lag. 



Eutriana cristata Trin. Gram. Unifl. 

 241. 1824. Based upon Atheropogon 

 chondrosioides Roem. & Schult. 



Chondrosium humboldtianum Kunth, 

 Rev. Gram. 1 : 93. 1829. Based upon 

 Dinebra chondrosioides H. B. K. See 

 also Fourn. Mex. PL 2 : 136. 1881, where 

 this species is also correctly interpreted. 

 Fournier cites Virlet 1412. This num- 

 ber in the herbarium of the Museum of 

 Paris is exactly comparable with my no. 

 6732, which is a young specimen of Bouteloua havardii. Schaffner 133, cited by Four- 

 nier, in Grisebach's herbarium, is likewise an immature plant of B. havardii. 



Bouteloua chondrosioides Griseb. in Fourn. Mex. PI. 2 : 136. 1881. This name, 

 presumably based on Dinebra chondrosioides, is mentioned as a synonym under Chon- 

 drosium humboldtianum. Watson a gives this combination with Bentham as the 

 author. , 



Bouteloua havardii Vasey in Wats. Proc. Amer. Acad. 18: 179. 1883. Republished 

 in Bull. Torrey Club 11:6. 1884. The specimen cited in the latter place is Havard 

 in 1881, from Limpio Mountains of western Texas. The type specimen in the Na- 

 tional Herbarium is numbered 53. See also IT. S. Dept. Agr. Div. Bot. Bull. 12 1 : 

 pi. 38. 1890; TJ. S. Dept. Agr. Div. Agrost. Bull. 7 : 216./. 198. 1897. 



Fig. 50.— Bouteloua pri-nglei. a, Spikelet; 6, c, lemma 

 and palet with rudiment attached; d, two views and 

 cross section of caryopsis. a, Scale 7.5; b-d, scale 15. 

 From type specimen. 



a Proc. Amer. Acad. 18: 179. 1883. 



9368°— 12- 



