420 PROCEEDINGS OF THE AMERICAN ACADEMY 



among rocks in canons; September. (537.) Pale^e of the pappus 

 only 5, the awns denticulate. Style-branches those of Eapatorium, 

 not short and truncate as figured by liemsley. Anther-tips obscure, 

 if any. Tliis plant is certainly not a congener of De Candolle's 

 DecachcBta, nor can it well remain in Ayeratutn. It seems to form 

 a good genus, distinguished from Ageratum by its cyliudraceous 

 several-flowered involucrum of oblong obtuse bracts imbricated in 

 three or four series, the outer successively shorter, and anthers nearly 

 inappendiculate ; from Decachceta by its slender minutely 5-toothed 

 corolla and 5-paleaceou3, not clavellately 10-setose, pappus. 



EuPATORiUM LEPTODiCTYON, Gray, 71. sp. Eximbricatit, E. stricto 

 (Gray, Proc. Amer. Acad. 21. 384) peraffine ; foliis plerisque alter- 

 nis rotundatis crebrioribus crenulatis lucidulis magis reticulatis, rete 

 venularum saltern paginte superioris subtiliter eximie areolata ; capitu- 

 lis paucioribus ; involucre 9-floro O-phyllo floribus dimidio breviore e 

 bracteis oblongis obtusis. — Rio Blanco ; July. (154-.) Seems to be 

 related to E. calaminthcefoUum, but probably not frutescent. 



EuPATORiUM DASTCAKPUM, Gray, n. sp. Siibimbricata, subgla- 

 brum ; caule suborgyali stricto superne coi ymboso-paniculato ; foliis 

 plerisque alternis angusto-lanceolatis utrinque atteuuatis subsessilibus 

 scaberulis hinc inde dentatis (majoribus 4-o-pollicaribus), ramealibus 

 linearibus integerrimis ; capitulis laxe paniculatis 18-20-floris semipol- 

 licaribus ; involucro campanulato e bracteis laxe biseriatim imbricatis 

 risridulis lineari-lanceolatis sensim acutissimis 2-3-nervatis, exterioribus 

 dimidio brevioribus ; coroUis albis vel ochroleucis ; aclieniis undique 

 canescenti-hirsutis ; pappi setis rigidulis barbellato-denticulatis. — Rio 

 Blanco, on hillsides ; September. (545.) The plant has the aspect, 

 inflorescence, and involucre of a Kuhnia, or of some ErickellicE. The 

 achenes are strongly pentangular, yet now and then with a secondary 

 nerve on one or two of the faces. The style-branches are remarkably 

 broad, clavate, and seemingly yellowish. 



EuPATORiGM TKiNERViuJi, Schultz Bip. in Seem. Bot. Herald, 300. 

 Larger and more floribund than Seemauu's plant, less " asperulous," 

 and heads at least 40-flowered. Rio Blanco, on hillsides ; September. 

 (563.) 



EuPATORiUM COLLINUM, DC. Prodr. 5. 1G4. Shrubby, 5 or G feet 

 high ; flowers white tinged with lavender. Rio Blanco, in barranca ; 

 September. (607.) 



EUPATORIUM INCOMPTUM, DC. Prodr. 5. 173. About 5 feet high, 

 the stems below very stout and striate-angled ; lower leaves all alter- 

 nate, G inches long, somewhat rhomboidal, or with short hastiform 



