VOL. I.] Co7'€oj>sidc<B and Tagrtincce. . 311 



is invalidated by one of the species of Tagetes, described below, and 

 several species of Porophyllum; P, scopariju:i^ P. crassifolhtni and 

 P. in'de7ifat2an^'^' which, all agree with Chrysactinia in their long tub- 

 ular corollas, and their short akenes not contracted at the top, and 

 much exceeded by the pappus, lessen much more than was previ- 

 ously supposed the distance between the two genera; the latter, 

 however, gaining a little strength from the additional species re- 

 cently described by Dr. Watson.f 



Baillon in Histoire des Plantes reduces the genera of the Tage- 

 tineae to six, including in Tagetes, Dysodia, Adenopappus, Nicolle- 

 tia, Adenophyllum, Hymenatherum and Thymophyllum; Pectis is 

 unchanged; Syncephalanthus, Schizotrichia and Chrysactinia are 

 kept up; and Lescaillea is reduced to Porophyllum. 



The presence or absence of rays can now hardly be considered of 

 generic importance, when it has so often been shown to have little 

 specific value. Nicolletia is therefore kept out of Porophyllum al- 

 most entirely by its double pappus, but a careful examination shows 

 the difference to be more apparent than real. In such species of 

 Porophyllum as P. trideidaiim and P, crassifoliian, especially in 

 some specimens of the last from Paso de los Dolores, the pappus 

 consists of an inner series of broader flattened awns or narrow scales, 

 and an outer one of brisdes, compacted at the base, however, into 

 a single series, as may be readily seen to be the case in Nicolletia. 



The species of Porophyllum are in many cases so carelessly de- 

 scribed, or founded on such trivial distinctions, as to be very un- 

 certain. Of the twenty-four enumerated in De Candolle's Pro- 

 dromus, eight, comprising the sections Ctisimbica and Ktigaia, were 

 transferred by Bentham and Hooker to Gynura in the Senecionidse. 



':phahu7iy P, ellipt. 



difl< 



lanceolaium, P. prenantJioides, P. Hcenkii, P. lineare, P. Ii7iifoH- 

 7im, P. linaria, P. tagetoides, P. dectimbcns, P. colorahim and P, 

 oblusifolium, have been added, P. gracile and P, trideniafum 

 Benth., Bot. Sulph., 29-30; P^ Seemaimi znd P,Lindent Schz. Bip. 

 Rot. Hprnld. i!oS! P. ang^ustissimwn Gardn., Hook. Lond. Jour. 



*A11 these species, excepting the first, agree with Chrysactinia in having a bulbous 

 base to the style, 



tC. truncata and C, pinnata, rroc. Am. Acad., xxv, 154. 



