364 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Chondrosium Desv. Nouv. Bull. Soc. Philom. Paris 2: 188. 1810. Based upon 

 Chloris procumbens Durand. 



Actiriochloa Willd.; Beauv. Ess. Agrost. 41. 1812. "A. tenuis Willd. manuscript" 

 mentioned as a synonym of Chondrosium. See also Roem. & Schult. Svsl. Veg. 

 2 : 417. 1817. Based upon Chondrosium procumbens Desv. 



Dineba Beauv. Ess. Agrost. 98. 1812. In listing the genera in which the species of 

 his proposed genus have been placed Beauvois gives after "Dineba Delil.," Aristida 

 first and without doubt had in mind A. americana L. In listing the species he places 

 "D. arabica (Cynosurus retroflexus ? Lin.)" first and "Aristida americana Lin.," fol- 

 lowing. In his illustrations he gives D. curtipendula first, followed by D. arabica 

 and D. americana. Delile a figures under D. aegyptiaca the same plant as does Beau- 

 vois under D. arabica. But this species does not belong to this group. (See list of 

 excluded names, p. 423.) 



Polyodon H. B. K. Nov. Gen. & Sp. 1 : 174. pi. 55. 1816. This is a monotypic 

 genus based upon F. distichum. 



Eutriana Trin. Fund. Agrost. 161. 1820. Based upon Chloris curtipendula Michx. 



Aristidium (Endl.) Lindl. Veg. Kingd. 116. 1846. Eutriana, section Aristidium 

 Endl.,& based on Dinebra aristidoides H. B. K. (misspelled "aristoides"), is listed as a 

 genus by Lindley. 



Triplathera (Endl.) Lindl. Veg. Kingd. 116. 1846. Eutriana, section Triplathera 

 Endl., c based on Eutriana multiseta, is listed as a genus by Lindley. 



Antichloa Sweet; Steud. Nom. Bot. ed. 2. 1 : 108. 1840. The same as "Actinochloa"; 

 a name only. 



Nestlera Willd. ; Steud. Nom. Bot. ed. 2. 2 : 192. 1841. Based upon N. festucaeformis 

 of Willdenow Herbarium, which is Bouteloua bromoides, i. e., B. radicosa, accord 

 ing to the Index Kewensis; names only. 



Erucaria Cervantes, La Naturaleza (Mexico) 347. 1870. (See list of excluded 

 names, p. 424.) 



"Chondrosia or Chondrosium Desv.;" Benth. Journ. Linn. Soc. Bot. 19: 104. 1881. 

 Simply a discussion of the general divisions of the group and a mention of Bouteloua 

 racemosa Lag. as the best-known species. 



Very variable in every detail; spikes one to 60; spikelets more than 3, d pectinate 

 or not, 2 to several-flowered, mostly 1-flowered, with one or more rudiments; the 

 lemmas 3-nerved, 3-awned, the palets 2-nerved, 2-awned. 



1. Bouteloua procumbens (Durand). 



Chloris procumbens Durand, Chlor. Sp. 1808. I am able to verity the opinions of 

 some of the older authors from a copy of the original description kindly furnished by 

 the Director of the Kew Gardens. 



Chondrosium procumbens Desv. in Beauv. Ess. Agrost. 41. pi. 9. f. 7. 1812. Based 

 on "Chloridis spec. Durand." Desvaux e also gives this, the only species, under his 

 genus Chondrosium, with Chloris procumbens Durand as a synonym. 



Atheropogon procumbens Jacq. Eclog. Gram. 16. pi. 12. 1813. (Copy in Gray Her- 

 barium.) The illustrations and description are good. Chloris procumbens Durand is 

 cited as a synonym . 



Bouteloua prostrata Lag. Gen. & Sp. Nov. 5. 1816. A specimen from Lagasca in 

 the herbarium at Munich appears to belong here, but the single culm before me has 

 two spikes, which is the unusual form of the species. Lagasca listed this species 



Descr. Egypte 26. pi. 11. f. 3. 1813. 



b Gen. PI. 9*4. 1836. 



c Trans. Linn. Soc. Bot. 20: 175. 1847. 



d An exception is found in B. uniflora which has one spikelet in a spike. 



• Journ. de Bot, 1 : 69. 1813. 



