CALIFORNIA ACADEMY OF SCIENCES. 189 



or imbricately, in four cells, the other two lying horizontally 

 across the base of the fruit, both attached to the same side: 

 seed obovoid, 9 lines long, light brown, encircled by a dark, 

 marginal line. — Megarrhiza Californica, Watson in Bot. Cal. 

 i. 241, as to the plant of Bigelow from Cocomungo. 



A species most distinct from E. fabacea, Naud. (31. Cali- 

 fornica, Watson) which has a globose, 4-seeded fruit, with 

 seeds of twice the size of those of the present species, and 

 which appears to inhabit only the central portions of the 

 State. E. macrocarpa takes its place from perhaps Santa 

 Barbara, or a little farther northward, down the peninsula 

 as far at least as Cedros Island. 



Concerning the fittest generic name for these plants, it 

 seems to the writer best to conform to that adopted by all 

 European authorities; although if the tropical and South 

 American species referred to Echinocystis should not present 

 any clear gradations between such seeds as those of the 

 original E. lobata and these turgid ones of the Pacific North 

 American species, one might fairly regard the latter group 

 as constituting a real genus; but Megarrhiza could not stand 

 as the name for it, when there is another which has the 

 priority by more than twenty years. 



There is one species which does not appear yet to have 

 obtained recognition under Echinocystis, namely: 



Echinocystis (Megarrhiza) Gilensis, Megarrhiza Gilensis, Greene, Bul- 

 letin Torr. Club, viii. 97. 



Inhabiting the region of the upper Gila River in Arizona 

 and New Mexico; resembling in its slender habit and small 

 leaves and fruit, the eastern type of Echinocystis, but with 

 the turgid, immarginate seeds, and perennial root of the 

 Pacific sub-genus. 



& v 



Pentachaeta (Eupentachseta) paleacea. 



A span high, with very numerous filiform branches : invo- 

 lucres small, scales in two series, pubescent, setaceous -tip- 

 ped: corollas of ray and disk yellow: akenes nearly linear; 



