OF ARTS AND SCIENCES. 25 



III. 



BOTANICAL CONTRIBUTIONS. 

 By Asa Gray. 



rrcscnted February 12 and May 14, 1879, with later Additions. 



1. Characters of some new Species of Composite in the Mexi- 

 can Collection made by C. C. Parry and Edward Palmer, 

 chiefly in the Province of San Luis Potosi, in 1878. 



Piquekia serrata. Glabra; caule 1 \- 3-pedali e basi perennante 

 ramoso ; foliis amplis (3-5-pollicaribus) omnibus oppositis ovato- 

 oblongis acuminatis.grosse argute serratis (dentibus utrinque 12-15) 

 basi in petiolum brevem marginatum subito contractis triplinerviis vel 

 fere trinerviis, nervis Iateralibus tenuibus ; capitulis corymboso-cymosis 

 trifloris ; involucri bracteis ovalibus obsolete trinerviis ; acheniis annulo 

 conspicuo deciduo coronatis, callo basilari parum obliquo. — Moun- 

 tains at Alvarez, thirty miles southeast of the city of San Luis Potosi, 

 Aug., Sept. No. 496. Involucre 2 lines long. 



Stevia stenopiiylla. Fruticosa, humilis, glabra, glutinosa; folii3 

 omnibus oppositis angustissime linearibus (poll. 2-3 longis lineam 

 latis) integerrimis eveniis, costa haud prominula ; ramis floridis gracil- 

 limis ; capitulis subsessilibus fasciculatis corymbiformi-cymosis ; co- 

 rolla alba ; acheniis inter costas scabro-hirtellis ; pappi paleis coroni- 

 formi-subconcretis muticis vel in pleris 2-3-aristatis. — Rocky hills 

 near San Luis Potosi, blossoming through the year. No. 319. A 

 very distinct species, allied to the narrow-leaved form (S. angustifolia, 

 HBK.) of A salicifolia, Cav. Foliage of purplish-green hue, very 

 glutinous. Among the forms of S. salicifolia collected was a very 

 dwarf one (no. 326), var. nana. The appended note relates to an 

 Ageratoid genus, which is not in Palmer and Parry's collection.* 



* OxYLonus, Mocino. Phania § Oxyhhus, DC. Proflr. v. 114. Distinguishing 

 this from true Phania, Bentham anfl Hooker append P. arbuti folia, DC, to Agera- 

 tum, following Kunth, and leave the P. trtnervia, DC, uncertain. I propose to 



