36 PROCEEDINGS OF THE AMERICAN ACADEMY 



and to recall the reference T had formerly made, and he had accepted, 

 of Lebetina to Adenopliylhun. This was the result of giving ^n'onii- 

 nence to the double pappus of unlike form. But this character breaks 

 down in respect to Lebetina cancellata and Dysodia poropliylla, DC, 

 which are likely to prove mere forms of one species, and would carry 

 some genuine Hymenathera to Adenopltyllum. A better limitation of 

 the genera is as follows : — 



ADKNOniYLLUM, Pcrs. ( WlUdenovi'a, Cav.), with involucre and 

 calyculate bractlets of Eudysodla, habit between that and Tagetes, disk- 

 corollas at least sometimes unequally cleft into long and narrow linear 

 lobes; and a double pappus, each of five palere ; the outer short and 

 truncate; the inner elongated-lanceolate, entire or with a pair of subu- 

 late teeth at apex where the strong costa is excurrent into a short awn. 

 The filiform style-branches are hispidulous above, at summit abruptly 

 produced into a hispidulous setaceous appendage. The single species, 

 A. coccineum, Pers. 



Dysodia, Cav., and chiefly of Lagasca, the distinguishing character 

 of Avhich is the multisetose polyadelphous pappus, i. e. the 10 to 20 

 palea; are resolved each into numerous (at least 9 or 10) long capil- 

 lary bristles. In one species only, D. cancellata, is there a different 

 outer series, the short p:,lea3 of which are usually entire, yet occasion- 

 ally setiferous. The involucre is not so diagnostic; for, although 

 mostly calyculate with accessory bractlets, and gamophyllous only at 

 base, or not at all, in J). serratifoUa (which can in no wise be referred 

 to Hymenatherum) it is even that of Tagetes. 



Hymenatherum, Cass , connected with the preceding by Aciphyl- 



about tlie length of tlie narrow throat (i.e. of the portion of tube above the 

 insertion of tiie stamens), wliich again is only equalled by tiie proper tube. 



PoROPHYLLUM GRACiLE, Beutli. Bot. Sulpli. 20. To tliis probably belongs 

 no. 449 of Coulter's Mexican collection, a depauperate form. 



PoRoi'HYi.i.iTM LiNARi.\, DC. {Cacdliii Linmia, Cav. Ic. iii. 2-57). To this we 

 slioul.l refer Coulter's no. 448, Tarry & Palmer's 502, Schaffner's 203, and with 

 little doubt Ilartwcg's 146. It is distinguished from the next by its perennial 

 root, thiekisli more sessile leaves, &c. 



PoROPiiYLLrM roLOR.\TrM, DC. The annual species with tliinnisli narrow 

 leaves, and violet-purple involucres, with little doubt including P.tafjetioidcs, DC, 

 Kleinia incjftioides and K. colorata, HBK., well figured under the latter name in 

 Mart. AmoRn. Monac. 23, t. 15. It comes from Schaffner, Bilimek, &c., and is 

 Bourgeau's 584, 30'Jl. 



PoiiOPHYLLUM suFFRDTicosuM Is R name which should be adopted for a 

 South Brazilian species which seems to have been taken for Mexican, if — as I 

 suppose — his Klfitiin aiiffniliroxfi, Vt'iUi]., and also of Lodd. Bot. Cab., t. 1501, 

 P. lini/ulium (mainly), and P. decmnbcns, DC. 



