CARDUACEAE. 437 



acute or obtuse at the apex^ mostly rounded or obtuse at the base, the slender 

 petioles 5-15 mm. long; heads several in the corymb; peduncles 5-10 mm, long; 

 involucre about 4 mm. high, its bracts oblong-lanceolate, acute; flowers violet 

 or white ; pappus scales lanceolate, ciliolate, awnless or some of them bristle- 

 tipped, about one-third as long as the achene. 



Waste places and cultivated fields, Abaco, Great Bahama and Andros to 

 Acklin's Island, Caicos and Turk's Islands and Ina^ua : — Cuba ; Jamaica ; Hispanionla ; 

 continental tropical America. Specimens from New Providence and Harbour Island, 

 referred by Dr. B. L. Robinson (Proc. Am. Acad. 49 : 463) to Ageratum conuzoides 

 inaequipalcacciim Hieron., do not appear to be specifically distinct from A. latifoUiim. 



Recorded by Schoepf, DoUey, Hitchcock and Mrs. Northrop as A. conyzoides L., 

 which it closely resembles. Wild Ageratum. Goat-bush. 



3. EUPATORIUM [Tourn.] L. Sp. PI. 836. 1753. 



Erect herbs or shrubs, with opposite or verticillate, or sometimes alter- 

 nate, often punctate leaves, andj in most species, cymose-corymbose discoid 

 heads of white, blue or purple flowers. Involucre oblongs ovoid, campanulate, 

 or hemispheric, the bracts imbricated in 2-several series. Receptacle naked. 

 Corolla regular, its tube slender, its limb 5-lobed or 5-toothed. Anthers obtuse 

 and entire at the base, appendiculate at the apex. Style-branches elongated, 

 flattened, or thickened above, stigmatic at the base. Achenes 5-angled, trun- 

 cate. Pappus of numerous capillary, usually scabrous bristles arranged in 1 

 row. [ISTamed for Mithridates Eupator. i. e., of a noble father.] Over 500 

 species, mostly of warm or tropical regions. Type siiyeciesiEupatorium canna- 

 iinum L. 



Leaves dissected into filiform segments. 



Heads not secund ; plants copiously pubescent. 

 Heads secund : plants essentially glabrous. 

 Leaves entire or dentate. 



Scales of the campanulate involucre in 1-3-series. 

 Plants glabrous. 

 Plants finely pubescent. 

 Scales of the cylindric involucre imbricated in several sieries. 

 Scales without densely pubescent tips ; leaves entire, 

 serrate, or crenulate. 

 Leaves acute or acuminate, serrate. 

 Leaves rounded or obtuse, entire or crenulate. 



Involucre 2—2.5 mm. thick ; scales narrow, 3- 



striate. 

 Involucre 3-4 mm. thick ; scales broad. 5-striate. 

 Scales with densely pubescent tips ; leaves coarsely 

 crenate. 



1. Eupatorium capillifolium (Lam.) Small, Mem. Torr. Club 5: 311. 1S94. 



Artemisia capillifolia Lam. Encyc. 1: 267. 1783. 

 Eupatorium foeniculaceum Willd. Sp. PI. 3: 1750. 1804. 



Erect, paniculately much branched, with the aspect of an Artemisia, the 

 stem finely pubescent, 1-3 m. high. Leaves crowded, dissected into filiform 

 segments, alternate, the lower petioled, the upper sessile; heads very numerous, 

 about 3 mm. high, short-peduncled, racemose-paniculate, 3-6-flowered; bracts 

 of the involucre in about 2 series, linear, cuspidate, narrowly scarious-margined, 

 glabrous; flowers greenish vrhite. 



Moist places, in coppices and scrub-lands. Great Bahama, Abaco. North Cat Cay. 

 Andros, New Providence, Great Guana Cay, Eleuthera. Cat Island, Watling's Island 

 and Fortune Island : — Bermuda ; southern United States : Cuba. Dog-fexnel. 



2. Eupatorium leptophyllum DC. Prodr. 5: 176. 1836. 



Erect, usually much branched above, 4-15 dm. high, similar to the preced- 

 ing species, but glabrous. Leaves numerous, mostly alternate, dissected into 



