OF NORTH AMERICA. I - 



508. SORBUSRIPARIA Raf. Autikon. Branch- 

 es rugose, folioles 9 to 15 oblong sessile, base 

 oblique entire, end acute equaly rnucronate 

 serrate, odd leaf petiolate broader acuminate ; 

 corymb paniculate, berries pisiform globular. 

 A small tree 10 to 20 feet high, growing on 

 the margins of Rivers, the Missouri, upper 

 Mississippi, lower Ohio, Wabash, Illinois ; but 

 rare. The fruit is very small commonly of a 

 saffron color with 3 seeds oval compressed in- 

 closed in a tough shell, and thus nearly a drupe 

 sometimes only one seed by abortion. Near 

 S. microcarpa, which however has folioles 

 acum. unequally serrate, not obliquate, berries 

 scarlet and larger. Here the folioles are 2 or 

 3 inches long, pale beneath, quite smooth, pe- 

 tiols compressed at the base. The genus SOR- 

 BUS must be preserved, although some writers 

 wrongly unite it to PYKUS : it is known at 

 first sight by the pinnate leaves, and the calix 

 not persistent nor crowning the fruit. It would 

 be better to unite to it all the tristyle sp. of 

 Crategus than to abolish it. 



509. TRILOPUS Mitchell, or HAMAME- 

 LIS Linneus, name posterior? This G. has 

 puzzled the Botanists, Jussieu wrongly united 

 it to BERUERIDES. It has now'be made the sin- 

 gle type of the HAMAMELIDES; but it is so near 

 to my SCLERANTIIIDES, that it must probably be 

 united thereto as a subfamily. Only 3 species 

 were known; besides the doubtful varieties of 

 Walter ; but I have observed 6 species, and 

 therefore shall now give their Monograph. They 

 may be called hycmal shrubs, since they blos- 

 som late in the autumn, after the leaves have 

 begun to fall. 



510. TR. OR II. MRGINICA Raf. ined, ft. tab. 



