Segregates of rhus. 131 



Sand dunes along the southern shores of Lake Michigan, 

 the type in U. S. Herb., from Clarke, Indiana, 1897, by L. M. 

 Umbach. 



S. Illinobnsis. Evidently a larger shrub freely branching, 

 the twigs pubescent : foliage scantily pubescent above, beneath 

 almost villous-tomentulose, along the veins fairly hirsute: term- 

 inal leaflet 2i inches long, rhombic-ovate, cuneate and entire at 

 base, above this each margin evenly and very obtusely 5 to 

 7-crenate, the pair 3-crenate on one side, 5-crenate on the other: 

 bracts of the several spikes tomentulose-ciliate, the back 

 glabrous : 



This is a shrub of central Illinois represented in U. S. Herb, 

 as collected by Dr. Brendel in 1878. 



S. FORMOSA. Branches glabrous except a few scattered 

 pilose hairs, but foliage villous-strigose on both faces, the veins 

 beneath hirsute : terminal leaflet 2 inches long, ovate and acute 

 above a very short and abrupt cuneate base, each margin very 

 evenly and beautifully 8 to 10-crenate, laterals smaller, hardly 

 inequilateral, rounded at the sessile base, subserrate-crenate on 

 both margins : fruits very large, hirsute. 



Sandy woods at Cobden, extreme southern Illinois, 8 June, 

 1885, M. B. Waite. Shrub with beautiful foliage strongly 

 characteristic. The locality is noted as that of a number of 

 local species. 



S. SBROTINA. Growing twigs delicately puberulent, the 

 mature glabrous : foliage in maturity vivid green and somewhat 

 shining as if glabrous, under a lens seen to bear scattered short 

 hairs everywhere, the veins quite pubescent on both faces; term- 

 inal leaflet 2 inches long or more, 1 1 wide, cuneate-obovate, 

 obtuse, each margin above the middle with 3 or 3 broad shallow 

 crenate lobes each crenate-toothed, the pair much smaller, 

 round-oval very obtuse and obtusely crenate: spikes short, 

 thyrsoidly congested near the ends of the twigs; flowers appear- 

 ing late, with the foliage almost full-grown.: fruit hirsute. 



Species of western Missouri, remarkable among Atlantic slope 

 species on account of its late time of flowering. It has been 

 distributed by B. P. Bush, from Independence ( in flower) and 

 from Eagle Kock (in fruit). 



