OF ARTS AND SCIENCES : JUNE 14, 1870. 287 



dentibus triangulari-subulatis brevi-cuspidatis ; staminibus rudimenta- 

 riis filiformibus apice capitellatis seu clavellatis. L. sinuatus, exaltatvs, 

 & angustifolius, Ell. L. vulgaris & august if alius, Nutt. Gen., sine 

 char. L. Europceus (Walt. &c.), van sinuatus, Gray, Man. 1. c. — 

 From Canada to Oregon, California, and Florida. 



L. Europ^eus, L. Caule acutiuscule tetragono ; foliis latioribus 

 subsessilibus, dentibus lobisve subsequalibus ; calycis dentibus subulatb- 

 spinulosis; staminibus rudimentariis obsoletis vel nullis. — Collected 

 long ago by Mr. Elias Durand near Norfolk, Virginia, where it was 

 said to abound ; recently detected on Petty's Island, near Philadelphia, 

 by C. F. Parker, on waste ballast : adventive from Europe, and proba- 

 bly not established. 



SESELT, L. 



It is on the whole remarkable that so many of the leading genera of 

 Umbelliferce in the northern parts of the Old World should be without 

 representatives in North America. Some of these gaps may be filled 

 Avhen the, botany of our Western regions comes to be more completely 

 investigated ; as one appears to be now by the two species of Scseli 

 here characterized. 



The first of these plants has been for several years known to me in 

 a specimen collected by Nuttall, in flower only, and presented by the 

 kind Mr. Durand. It is ticketed by Nuttall " Cynomarathrum saxa- 

 tile" but it is not published. The same plant, in fruit only, was 

 gathered by Dr. Parry in 1867, in the mountains of the northeastern 

 part of New Mexico. The second species is no. 221 of Hall and 

 Harbour's collection in the skirts of the Rocky Mountains, in flower 

 only, and therefore not hitherto determined. Dr. George Vase}', in 

 going over the same ground in 1868 at a later season, had the good 

 fortune to obtain specimens in fruit; it is no. 221 of his recently dis- 

 tributed collection. 



S. Nuttallii, n. sp. Acaulescens, glabrum ; foliis subternato-pin- 

 natipartitis, segmentis linearibus subulato-mucronatis, majoribus denti- 

 bus lobisve 1-3 nunc instructis ; scapo simplicissimo nudo folia baud 

 superante ; floribus ut videtur albis ; fructu oblongo glaberrimo pedicello 

 parum longiore dentibus calycis subulatis conspicuis coronato; vittis in 

 pericarpio parum suberoso ad valleculas et bine inde sub jugis tenui- 

 bus ; seminis sectione transversa semicirculari subcrenata. — Rocky 

 Mountains, Nuttall. On rocks, Huefano Mountains, New Mexico, 



