ROBINSON, — STUDIES IN THE EUPATORIEBAE. 85 
by the presence of the aristate pappus, which is quite lacking in 
S. Pringlei. 
Fleischmannia arguta, n. comb. Hupatorium argutum HBK. 
Nov. Gen. et Spec. iv. 121 (1820). E. quinquesetum Benth. ex Oerst. 
Vidensk. Meddel. 1852, p. 79. Fleischmannia rhodostyla Sch. Bip. 
Flora, xxxii. 417 (1850). The type of Zupatorium argutum HBK. is 
still extant at the Museum of Natural History in Paris. It is clearly 
just the plant which has long passed as Fleischmannia rhodostyla and 
its much earlier specific name must accordingly be taken up. 
Trichocoronis sessilifolia, n. comb. Argeratum sessilifolium 
Schauer, Linnaea, xix. 715 (1847); Hemsl. Biol. Cent.-Am. Bot. ii. 83 
(1881). Trichocoronis Greggii Gray, Pl. Wright. i. 89 (1852). The 
type of Schauer’s Ageratum sessilifolium is Aschenborn’s no. 4, of 
which there is a well preserved specimen in the Royal Botanical 
Museum in Berlin. The habitat is given as Mexico, but without more 
particular locality, and the species has remained obscure. On exami- 
nation it proves to be identical with the species later described as 
Trichocoronis Greggii by Dr. Gray. Gregg’s plant (no. 807 of his last 
Mexican collection) is said to have come from the region between 
Mazatlan and the City of Mexico. Fortunately Mr. Pringle has redis- 
covered the species, and the fuller data of his label give definite infor- 
mation of at least one station, namely, marshes of Atequiza in the 
and in its abortive setiform pappus. In fact, almost its only claim to 
generic separation is in its broad obovate quasi two-win achenes, 
issothrix Stevia : 
Lond. Jour. Bot. v. 458 (1846). Dissothriz Gardneri Gray in Hook. 
Jour. Bot. & Kew Mise. iii. 223 (1851); Bak. in Mart. Fl. Bras. vi. pt. 
2, 272 (1876). Dr. Gray’s specific name, coined at a time of greater 
nomenclatorial laxity, must, according to priority, give place to the 
original name given by Gardner. 
