OP ARTS AND SCIENCES. 411 



full-grown embryo. Having waited in vain for better material, I now 

 give the carpological characters, drawn from what we possess. 



Ltonothamnus asplenifolius, Greene, Bull. Calif. Acad. i. 187. 

 Folia pinnatisecta in segmenta 3-5 approximata lato-linearia pinnati- 

 partita, lobis crebris semilunato-deltoideis. — Faint indications of stip- 

 ules are seen in this species, of which the known materials are still 

 imperfect. It is hoped that Santa Cruz Island, off Santa Barbara, and 

 the other islands of that coast, may soon be explored. 



This is another of those genera which tend to obliterate the distinc- 

 tions between the Rosacea and the Saxifragacece. Notwithstanding the 

 likeness to Vaiiquelima, I still incline to refer this genus to the latter 

 order (next to Jamesia and Fendlera), on account of the opposite leaves, 

 dicarjiellary ovary, and albuminous seeds, although indeed the albu- 

 men is thin. Vauquellnia is obviously Rosaceous. Both the species 

 ( V. corymbosa and V. Torreyi) not rarely show minute adnate stipules 

 to their alternate leaves; and they have more than "two" — at least 

 four — ovules in each cell of the 5-merous and syncarpous ovary, all 

 ascending from next the base of the cell. The seeds have an apical 

 wing, as figured, and are completely exalbuminous, the broad and flat 

 cotyledons filling the seed-coat completely. 



The following has already been published in a Supplement to a 

 second issue of the Synoptical Flora (pp. 448, 449) ; but it is thought 

 best still to print here the original description. 



DIMERESIA, Nov. Gen. Comp.-Inuloideanim. 



Capitula biflora, discreta, homogama. luvolucrum diphyllum ; brac- 

 teis herbaceis oblongis basi tantum connatis, utrisque florem hermaph- 

 roditura fere amplectentibus. Corollae tubulosae, regulares, 5-dentatae. 

 Antherae basi breviter caudato-sagittatae. Styli rami augusto-lineares, 

 obtusi, ad apicem usque liueis stigmaticis marginati. Achenia clavato- 

 pyriformia, multistriata, glabra, areola epigyna parva. Pappus e setis 

 20 validis plumosis uniseriatis basi in annulum connatis, mox deciduus. 

 — Herbula annua, depressa, vix caulescens, glabrata ; foliis rosulato- 

 confertis crassiusculis obovatis integerrimis 3-5-nervati8 basi in petio- 

 lum marginatum angustatis ; capitulis subsessilibus plurimis inter folia 

 congestis ; floribus ut vidutur albidis. 



DiMEUESiA HowELLii. — On Stciu's Mountain, in southeastern 

 part of Oregon, June, 1885, Thomas Howell. Also received, since 

 this account was written, from IF. C. Cusick, who found it a little 

 later in the same district. — A singular little plant, named from the 

 two-flowered heads, with involucre reduced to two bracts, one sub- 



