12 PROCEEDINGS OF THE AMERICAN ACADEMY 



pedales) basi sessili in caulem decurrentibus oblongis plurilobulato- 

 dentatis. — Soledad, near IMouclova, Northern Mexico, Palmer, 733. 



To the same group, although some of them are shrubby, belong V. 

 gigantea, Jacq. (which Ghiesbreght collected in Chiapas, although 

 Hemsley does not give it as Mexican), V. pinnatijida, Cav. (to which 

 belongs V. microcephala of Schultz Bip. and Liebman, can it be also 

 of Benth. ?), V. serrata, Cav., V. pauciflora, Hemsley, which is un- 

 known to me, V. sororia, Gray, and a somewhat different set of 

 species, such as V. virgata, Cav. (to which V. per sicce folia, DC, may 

 be suspected to belong), V. salicifoUa, HBK. (to which and not to 

 the preceding Bourgeau's no. 963 should be referred, it being the 

 same as SchafFner's plant from Tacubaya, also Parry & Palmer's no. 

 457, which has been confounded with V. persiccpfolia, DC), V. Grayi, 

 Benth. & Hook., according to Hemsley, and others with which I am 

 little or not at all acquainted. 



§ 2. Pterophyton, Torr. & Gray. Capitula latiora, aut solitaria 

 autsparsa: involucrum imbricatum (nee foliaceum, nee laxe patens): 

 receptaculum convexum vel conicum : discus fructifer baud squar- 

 rosus : ligulse aut neutras, aut saepius styliferJB sed steriles, rarius 

 fertiles : aristce dum adsint rectas. — Pterophyton, Cass. &, Actino- 

 meris, Nutt., pro parte. 



To this, rather than to a separate and ill-definable section, I should 

 refer various sjjecies which have not winged stems, even if they should 

 have fertile ray-flowers. The U. S. species with naked stems are, — 



V. LONGIFOLIA, Actinomeris longifolia, Gray, PI. Wright, ii. 89, a 

 peculiar species thus far confined to Arizona. The involucre is dis- 

 posed to be foliaceous-bracted. 



V. Wrightii, Actinomeris Wrighlii, Gray, PI. Fendl, 85 ; Roth- 

 rock in Wheeler Rep. t. 8. Texas to Arizona, and recently collected 

 by Palmer in Mexico. 



V. Warei, Actinoineris paucijiora, Nutt., of Florida. There is a 

 Mexican V. paiicijiora of Hemsley. 



V. NUDiCAULis. Helianthus ? aristatus, Ell. Sk. ii. 428. Actino- 

 meris nudicaulis, Nutt. Trans. Am. Phil. Soc. S. Atlantic States. 



Of the wing-stemmed species, or Pterophyton proper, there are only 

 two U. S. species known, viz. : — 



V. iiETEROPHYLLA, Actinomeris heterophylla, Chapm. in Coult. 

 Bot. Gazette, iii. G ; native of Florida, most related to the preceding. 



V. HELIANTUOIDES, Michx., Actinomeris helianthoides, Nutt. ; from 

 Ohio to Texas. 



