OF ARTS AND SCIENCES. 163 



by the single pair of ovules to each cell, forming large seeds. The 

 latter are very like those of Xama demissa and of Conanthus. As to 

 PhaceUa, which might be thought polymorphous enough to include 

 almost any plant of this sort, even if we disregard the technical char- 

 acter of the distinct styles, yet the geminate ovules and seeds in this 

 plant are characteristic, being superposed, while those of Phacelia, 

 when reduced to single pairs, are collateral. 



Of late years I have had frequent occasion to associate the name of 

 Mr. J, G. Lemmon with species of his own discovery ; and I seize 

 with satisfaction the present opportunity of further commemorating the 

 services of a most ardent and successful explorer of the Siena Nevada 

 region, by naming in his honor this interesting new genus which he 

 alone has met with. By the specific name, Californica, I indicate the 

 principal field of Mr. Lemmon's arduous explorations. 



ECHINOSPERMUM, Sect. Echinoglochin. 



Nuculfe immargiuatse, ovato-trigonse, dorso (medio carinulato) undi- 

 que inordinate aculeolatoe, aculeis tota longitudine setulis retrorsis 

 armatis ; areola prope basim ovata. Corollas lobi convoluto-imbricati. 

 Pedicelli fructiferi erecti. Calyx fructifer patens, nee reflexus. 



ECHINOSPERMUM Greenei. EritHcMo fulvo sat similis, iiltra- 

 spithamoeum, e radice annua laxe ramosum, pilis albidis striguloso- 

 pubescens ; foliis linearibus obtusis ; racemis solitariis geminisve 

 laxiusculis hie inde (basi prtesertim) folioso-bracteatis ; calyce fulvo- 

 sericeo-hirsuto ; lobis oblongo-Iinearibus obtusis corollam albam sub- 

 sequantibus ; nuculis (sesquilineam lougis) calyce brevioribus inter 

 aculeas sparsas teretes {^—\ lineam longas) tuberculato-scabris intus 

 acute carinatis. — About Yreka, Siskiyou Co., in the northern part of 

 California, 1876, E. L. Greene. An additional and singular link 

 between Echinospermum and Eritrichlum, but technically belonging to 

 the former, if not worthy of generic distinction ; remarkable for having 

 the prickles glochidiately barbed not merely at the apex, but for their 

 whole length, and not at all arranged in lateral ranks. 



ECIIIDIOCARYA, Gray, char, reformatum. 



Calyx o-partitus ; segmentis sub fructu parum apertis. Corolla 

 rotato-hypocraterimorpha ; tubo calycem suba^quante lobis rotundatis 

 breviore, plicis faucialibus pi. m. intrusis. Filamenta brevissima medio 

 tubo inserta : antherge oblonga?, inclusee. Stylus brevis : stigma capi- 

 tatum. Nuculae ovato-trigonse, obliquie, cristulato-rugosas, dorso ven- 

 treque carinatse, in stipitibus crassis aut discretis aut per paria coalitis 



