390 PROCEEDINGS OF THE AMERICAN ACADEMY 



caribus) multifloris ; involucri laxi bracteis exterioribus herbaceis 

 angusto-oblougis disco brevioribus patentissimis (demum deciduis), 

 interioribus erectis membranaceis ; floribus radii paucis styliferis sed 

 sterilibus, ligula parvula lineari ; acheniis disci elongato-oblongis 

 aDgusto-alatis nunc subalatis lin. 3-4 longis aristis pappi 2 gracili- 

 bus vix duplo longioribus. — Near Batopilns, Palmer, 170. " A bushy- 

 plant, sunflower-like, 5 to 8 feet high," the branches herbaceous, but 

 at least frutescent below ; stems not at all wing-margined. 



Verbesina cymosa. Verhesinaria, e grege V. arhorece, fruticosa, 

 ultra-orgyalis, tomentulosa ; ramis foliosis exalatis cyma composita 

 corymbiformi polycephala aperta terminatis ; foliis oppositis lanceo- 

 latis utrinque attenuatis serrulatis penniuerviis (6-9 poll, longis cum 

 petiolo brevi) supra hispidulo-scabris subtus canesceuti-sericeis ; capi- 

 tulis pedicellatis angusto-oblongis 7-9-floris ; involucre duplici, nempe 

 e bracteis 8-9 lanceolatis obtusiusculis viridulis erectis biseriatim im- 

 bricatis disco dimidio brevioribus et totidem tenuioribus lineari-oblongis 

 flavescentibus flores sub:vquantibus paleis receptaculi referentibus ; 

 acheniis ignotis ; ovario brevi obovato biaristato ; aristis filiformibus 

 sed oboompressis puberulis corolla paullo brevioribus. — Mountain ra- 

 vines near Batopilas, " upright, many-stemmed, 8 feet high, with 

 golden-yellow blossoms," Palmer, 135. 



BiDENS LUDENS. Psilocavpcea, annua, glabra ; caule bipedali 

 ramoso corymboso-floribundo ; foliis tenuibus bipinnatipartitis, lobis 

 linearibus ; involucro campanulato (lin. 2-3 alto), bracteis exteriori- 

 bus patentibus linearibus vel lineari-spathulatis hirtello-ciliatis ; liguHs 

 (neutris) conspicuis ovalibus (lin. 3 longis) aureis ; acheniis hirtello- 

 scabris tetragonis heteromorphis, extimis obovato-clavatis sesquiline- 

 aribus calvis, interioribus sensim longioribus angustioribus, intimis 

 (lin. 3 longis) fere linearibus basi apiceque parum attenuatis aut calvis 

 aut breviter biaristatis, aristis subulatis versus apicem setis 2-4 validis 

 retrorsis (persistentibus vel deciduis !) barbatis. — Cool hillsides and 

 along streams, northwest of the city of Chihuahua, Pringle, 293, very 

 sparingly collected. 



Leptosyne (Coreocarpus) Arizonica, Gray, Proc. Am. Acad, 

 xvii. 218, & Syn. Fl. i.^ 301. Found on the mountains behind Bato- 

 pilas, at about 7,000 feet. Palmer, 294. 



Tridax erecta. Hispida vel hispidula ; caule erecto paniculatim 

 ramoso e radice annua (nee modo peraffinis T. procumbentis procum- 

 bente e radice perenni), ultrapedalis ; foliis membranaceis aut ovalibus 

 dentatis aut dilatatis trifidis, lobis denticulatis rariter iucisis ; ligulis 

 brevibus saturate luteis ; paleis receptaculi costa excurrente aristatis ; 



