34 PROCEEDINGS OF THE AMERICAN ACADEMY 



De Candolle's B. Unifolia, which is said to have a terete simple 

 stem, scabrous-serrulate leaves, and corymbose heads. 



Gnaphalium concinnum. Rliodo gnaphalium. (Schultz Bip.) ; 

 caulibus subherbaceis e basi parum lignescente pedalibus ; foliis 

 oblongis obtusis fere planis mollibus (lin. 6-9 longis 2-3 latis) supra 

 viridulis floccoso-pubescentibus subtus dense cano-lanatis ; cyma 

 corymbiformi fere aphyllo ; capitulis floribusque fere G. Seemanni ; 

 involucro bracteis exterioribus appendice lactea oblonga obtusissima 

 radiato-patente terminatis. — In the highest mountains southeast of 

 San Luis, No. 423. This is the handsomest species of that pecu- 

 liar Mexican group, founded by Schultz on his G. Seemanni and 

 G. rhodanthum, to which he should have added G. lavandulcefoliiim, 

 DC, and which Bentham, in the Genera Plantarum, refers to Chio- 

 nolcena, DC. They are andine species, with very leafy stems, the 

 older leaves below reflexed and marcescent, the living ones widely 

 spreading ; the involucres of the heads with showy and radiant petaloid 

 tips ; the flowers purple or rose-color. In G. Seemanni (which 

 Hemsley has recently redescribed under the name of Chionolcena 

 corymbosa), and in the present species, the pappus of the hermaphrodite 

 flowers consists of conspicuously clavellate-tipped bristles ; in G. rho- 

 danthum and G. lavandulcefoliiim they are only slightly so. I do not 

 fjnd that they are united at base, certainly they are not •' basi in cupu- 

 lam concretis," and for the most part they seem to fall away singly. 

 The style of these flowers is bifid at the apex in all but G. lavandulce- 

 foliiim, and not always quite entire in that. The ovary is ovuliferous, 

 but generally it appears to be sterile. The involucral bracts in G. 

 rhodanthum are less radiant than in the two more northern species. 

 I have not seen the Brazilian Chionolcena, but, upon the above data, 

 these Mexican species can hardly belong to that genus, nor be well 

 separated from Gnaphalium. The stem of G. concinnum seems to be 

 nearly herbaceous, but enduring, being in some specimens continued 

 by successive growths beyond the cymes of one or two former sea- 

 sons, leaving these deeply lateral. 



Lindheimera Mkxicana. Pumila, a basi ipsa florens ; foliis 

 lyrato-pinnatifidis longius petiolatis, lobis inciso-dentatis ; ligulis 8-10 

 oblongis grosse 2-3-dentatis ; acheniis luevibus ala conspicua scariosa 

 sinuato-incisa sursum latiore cinctis a paleis contiguis liberis ; dentibus 

 lateralibus pappi obscuris aloe accretis, interno majusculo ; stylo fl. 

 masc. apice bifido. — Between the city of Mexico and San Luis ; 

 station not specified. No. 447. The genera related to Silphium are 

 not very strongly marked ; and the reference of the present plant to 



