200 PROCEEDINGS OF THE AMERICAN ACADEMY 



dilated iuto two divaricate lobes or crests, which are muriculate-papil- 

 lose, and between these a smaller and emarginate central crest is 

 interposed. 



Laciinostoma AuizoNicuM. Tills brcvihus pubesccns; caulibiis 

 gracilibus libenter volubilibus ; foliis membranaceis cordato-safittatis : 

 pedunculis gracilibus 2-7-Horis ; corollaj alba? extus glabra; tubo sepala 

 subaiquante lobis ovato-oblongis parce viridi-reliculatis vix breviore, 

 iauce retrorsuui villosa ; corona simplici uuda crateriformi pra;ter 

 marginem liberum crassiusculum 10-crenatum tubo corolhe adnata (eo 

 vestiente); columna lilamentorum longiuscula ; folliculis ovoideo-lan- 

 ceolatis bcvibus glabris. — Southern Arizona; in the Santa Catalina 

 Mountains, Lemmon (no. 303G, coll. 1883), distributed as Gonolohns 

 reticulatiis ; and in the same district, coll. Pringle, 1884. — The 

 main distinctions between Laciinostoma and Gonohhus, namely, the 

 short-sal verform or at least tubular-based corolla of the former, with 

 corona adnata to the tube, were indicated in Proc. Am. Acad. xii. 74, 

 when the only true species then known was the original L. tigrimun, 

 IIBK. Since then, in Bot. Biol. Centr.-Amer. ii. 335, IIcm>iley has 

 added a second species, from Guatemala ; and I consider that we have 

 a third in the present plant. The principal structural difference is 

 that the corona is not produced beyond the adnate portion into five 

 two-lobed squamae ; but these are represented by the ten crenulations 

 or short lobes of its ireG border. These are glabrous : the villosity 

 belongs wholly to the throat of the corolla. The filaments are some- 

 what lono-er than in L. tigrinum, and, though monadelphous, are 

 disposed to separate in withering flowers. 



AcKRATKS BIFIDA, Rusl)y in litt. A. viridijlorce sat similis ; foliis 

 omnibus oppositis puberulo-tonientosis lato-lanceolatis l)asi attenuatis ; 

 floribus paullo minoribus longius pedicellatis ; cucullis pallidioribus 

 antheris parum brevioribus bipartitis, segmentis lanceolatis. — Arizona, 

 coll. Dr. H. H. Rushy, 1883, probably in Yavapai Co., in a single 

 specimen. — Botanists collecting in Arizona should find again this 

 remarkable species, so peculiar for its divided hoods. It has probably 

 escaped attention on account of its near, general resemblance to tlie 

 polymorphous and widely diffused A. viridijlora. It might be referred 

 to the section of the genus which contains that species, or a new section 

 may be made for it, indicating the peculiarity of the two-parted hoods, 

 of which there is no trace in any other species of Aceratcs. The dis- 

 coverer had not unnaturally taken the plant for a Gomphocarpus, but 

 it clearly belongs to the present genus. 



