OF ARTS AND SCIENCES. 65 



division contains a remarkable new species, M. atteniiata, Greene, 

 from the vicinity of Berkeley and of Monte Diablo, having attenuate- 

 fusiform akenes, the slightly narrowed upper half not occupied by the 

 seed : the species with more or less turbinate akenes are M. Bigeloviiy 

 M. Douylasii, and M. 'platycar'plia ; the last, which was very rare, 

 now abundantly collected on hills around San Diego and San Luis 

 Rey by Parry and others. 



§ NoTHOCALAis. M. troximoides, Gray, a remarkable plant, inter- 

 mediate between Mtcroseris and true Troximon, appears to have a 

 rather wide range, from Montana to N. W. California. 



HiEUACiUM. One or two species of the section Pilosella, as limited 

 by Fries in his Epicrisis, are sparingly naturalized or adventive in this 

 country. 



Of Archieracium, Fries, a form of H. murorum is also natui-alized, 

 and H. vidgatnm, Fries, apparently occurs in Labra<lor. We have 

 two leafy-stemmed species of this section, viz. : 1. H. umhellatiim, L , 

 an old-world species of only a northern range in this country, to 

 which H. macranthimi, Nutt., and H. rirjidum, Fries, may be referred ; 

 2. H. Canadense, Michx., which may be taken to include //. corym- 

 bosum, Fries, as to the Newfoundland plant, JI. miratiim, Fries, and, 

 if the species is also N. European, //. crocatum, Fries. Even the 

 distinctions between these two species are indefinite. 



The section Stenotheca, as defined by Fries, contains all our other 

 species ; but in some of the Western ones the character as to the 

 involucre does not so well hold. 



1. Atlantic Species, all yellow-flowered and with sordid pappus. 

 Those with columnar akenes, not tapering at summit, and loosely 

 corymbose-cymose heads, are H. paniczdatum, L., H. venosiim, L. 

 (partly), If. scabnim, Michx., and a species or set of forms which 

 almost fill the seemingly most wide interval between the last two, and 

 which, without much doubt, is IT. CaroUnianum of Fries, founded on 

 specimens collected by Beyrich in pine barrens of Carolina ; while 

 the larger forms, having tomentose pubescence on the peduncles and 

 involucre, may be suspected to be H. Marianum, Willd., a mut-h older 

 name. Indeed, the species is well represented by the H. Marianum, 

 Pidmonarice Gallicos. suhrotimdis foliis^ &c., of Pluk. Mant, 102, t. 420, 

 f. 5, whence the specific name. H. Rugelii, Arvet-Touvet, recently 

 published, should be a form of the same. Fries assigns to H. Caro- 

 Unianum "achenia longa, gracilia, sursum manifesto attenuata." So 

 they are in our plant when half grown and not filled out, but at 

 maturity there is no perceptible narrowing at summit. 



VOL. XIX. (n S. XI.) 5 



