52 PROCEEDINGS OP THE AMERICAN ACADEMY 



# * Leaves 3-7-neTved or triplinerved, not lobed. 



C. Floridana. Has been mistaken for a form of G. tuherosa and 

 for C. diversifoUa. Accords with the latter in having the corolla- 

 lobes little longer than the oblong-cam pan ulate throat ; is stout, with 

 thickish leaves (apparently under the influence of brackish water) ; 

 these ovate or oval, obtuse, all acute or contracted at base, coarsely 

 and obtusely dentate ; stem strongly striate-angled. — Coast of V^. 

 Florida, Palmer, Chapman. 



C. OVATA, EIL, perhaps of Walter; but the brief character accords 

 better with the next. 



C. TUBKROSA, Nutt. Gen., «fec. 



C. LANCEOLATA, Nutt. To this or to C. diversifoUa may be re- 

 ferred Walter's C. hastata. 



§ 3. Mexican species, and one Arizonian, with cymosely disposed or 



rarely paniculate heads. 

 * Corolla-lobes linear, very much longer than the throat, i. e. limb 5- 



parted to near and sometimes quite down to the proper tube. 

 •»- Akenes (as in all the preceding) very glabrous ; but the herbage 

 of these more or less pubescent. 



C. DECOMPOSITA, Gray, PI. Wright, ii. 99. Senecio Grayanus, 

 Hemsl. Biol. Centr.-Am. Bot. ii. 241. The only species within the 

 limits of the United States. Has small and few-flowered heads, and 

 decompound-dissected leaves. 



C. CiCRViARi^FOLiA, DC. Senecio cerviaricefoUus, Hemsl. 1. c. 

 t. 51. Certainly very unlike a Senecio ; and it is not surprising that it 

 has been taken up as a genus, first by Zuccarini (as Odo7itotrichum), 

 next by Kunze (Sciadoseris), and lastly by myself (as Mesoneuris) ; 

 and it was left for Benthani to ascertain that it was a Cacalia of De- 

 Candolle. The pappus is unusually rigid. 



C. siNUATA, Llav. & Lex., DC, which Hemslcy, in the work above 

 cited, has named Senecio calophyllus. A well-known Mexican species, 

 with pappus less rigid. 



C. PELTATA, HBK. Nov. Gen. & Spec. iv. t. oCA. Psacalivm 

 peltntum, Cass., DC. Senecio peltiferus, Hemsl. 1. c. Plas a soft and 

 white pappus and large heads. 



C. TABULARis. Senecio tnbidaris, Hemsl. 1. c. 248. Tliis we 

 know only from the specimen of Bourgeau, no. 292G ; a species with 

 thin peltate leaves and jiaiiiculate few-flowered heads of small size. 



C. rACiiYPiiYLLA, Schultz Bip. in Seem. Bot. Herald, 310. Senecio 

 sclerop/ii/Ilns, Hemsl. 1. c. Remarkable for its radical leaves, large, 

 thick, reniform, reticulate-veuulose. 



