1 86 GREENE 



evidently more ascending than is usual in the genus, and the 

 large rather narrow panicle — all these marks indicate a 

 species, and one possibly somewhat local about Lake Michigan. 

 The type specimens, all in Herbarium Field Museum, are from 

 Hinsdale, a suburb of Chicago, and were collected October 12, 

 1902, by Ernest C. Smith, his distribution No. 577. I also 

 refer here without hesitation Mr. O. E. Lansing's No. nil, as 

 in Herbarium Field Museum, from West Pullman, 111., Septem- 

 ber 8, 1900. 



Later than all these are specimens sent me late in August, 

 1906, from near Nashotah, Wisconsin, by Dr. H. V. Ogden 

 of Milwaukee. These came to hand after the above diag- 

 nosis of J?, valida had been finished, and the type specimens 

 returned to the Field Museum. But they answer perfectly to 

 my description of the species in every particular, and therefore 

 only further confirm it while extending its range. 



14. RHUS LONGULA, sp. nov. 



Stem and branches not known : leaves about 3 dm. long, with 

 long stout ascending petiole, and 13 or 15 approximate leaflets, 

 these 7-9 cm. long, sessile by a rounded base, the apical acumi- 

 nation short though slenderly attenuate, the margins lightly and 

 almost subcrenately serrate with about n or 12 serratures, tex- 

 ture firm, hardly subcoriaceous, color dark dull-green above, 

 whitish-glaucous beneath : fruiting panicle narrowly oblong and 

 greatly elongated, 18 cm. long, hardly 5 cm. wide at the widest 

 part, the short branches hirtellous-tomentulose ; drupelets of 

 middle size and numerous. 



Bluffs of the Mississippi River far northward ; the special 

 station for the type somewhere near Stockton, Minnesota ; the 

 type specimen in U. S. Herbarium, No. 19813, collected by 

 Mr. John M. Holzinger, August 23, 1888. Also on sheet 

 19811 is aflowering specimen by the same collector, of "May, 

 1889," which appears to be the same specifically. The station 

 for this is not named. 



That R. longula, away at the western North should flower 

 in May is noteworthy ; for its ally, R. glabra, so far southward 

 as the valley of the Potomac does not begin to flower until July. 



