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OP ARTS AND SCIENCES. 71 



V. 



MISCELLANEOUS BOTANICAL CONTRIBUTIONS. 



By Asa Gray. 

 Presented, Oct. 12, 1875. 



The following notes and characters relate mainly to Califorui m 

 botany, the writer having been engaged in the preparation of the 

 Gamopetal(je for Professor Brewer's Botany of California, now print- 

 ing. Some of the observations are such as could not well be recorded 

 in that work ; and the characters of certain new genera and species 

 may appropriately be introduced to the botanical world in a continua- 

 tion of the " Contributions " which have from time to time been com- 

 municated to the Academy, and published in its Proceedings. My 

 first note has reference to two plants of the Atlantic United States, 

 wiiich have lonij been confounded. 



•^ Sedum pusillum Michx, Glauco-pallidum, -l-S-unciale ; foliis 

 alternis teretiusculis oblongis (lin. 2-3-longis) ; floribus ad summitatem 

 ramorum laxe cymosis tetrameris ; pedicellis petala alba oblongo-ovata 

 acutiuscula suba^quantibus ; folliculis elongato-oblongis stylo brevis- 

 simo subito apiculatis ; seminibus ovali-oblongis. — On granite rocks ; 

 Flat Rock near Camden, South Carolina, Michaux ; Stone Mountain, 

 Georgia, W. M. Canby, 1869, and A. Gray, 1.875. This little plant 

 I found on Stone JNIountain, in great abundance from the base to near 

 the summit, in full blossom on the 19th of April last. Fruiting speci- 

 mens were sparingly collected at the sam.^ station in May, 1809, by 

 Mr. Canby, who, however, did not distinguish it from Diamorpha 

 pusilla Nutt., which accompanies it, but is most abundant towards and 

 upon the summit of this singular granitic mountain. I cannot learn 

 that the true Sedum pusiUum has been elsewhere seen, except, long 

 ago, by Michaux. But the two are probably associated at other 

 stations. At least they must be so at Flat Rock. For there Nuttall 

 collected, in winter, old fruiting specimens of the plant he described in 

 his Genera Plantarum, p. 110, as '■'■Tlllceal cymosa {Sedum pusillum 

 Michx.)," and on p. 293 as " Diamorpha piusilla {Sedum picsillum 



