134 LEAFLETS. 



notably petiolulate, broadly oval or even somewhat rhomboid- 

 oval, deeply sharply and closely serrate, the acutish apex 

 aristate-mucronate when young, this mucro deciduous, both 

 faces glabrous, the lower marked with feather veins but no 

 reticulation : flowers in a closely sessile terminal corymb : 

 ovary glabrous ; sepals apt to be glandular, the glands nearly 

 sessile. 



This fine well-marked rose of the subherbaceous group is 

 known only as collected by Mr, Rydberg (his n. 1932), in 

 central Nebraska, in July, 1893 ; the special locality being 

 hills near Plummer Ford, Dismal River, Thomas County. Of 

 the same low mainly herbaceous character as the foregoing, 

 this plant is (l) glabrous, the leaflets (2) very notably petio- 

 lulate, (3) reversing the usual order they are very glaucous 

 above, and of a deeper green beneath. 



Rosa rudiuscula. Stems 2 feet high, woody to the sum- 

 mit, but simple except as to flowering twigs, densely prickly, 

 the prickles unequal, none very long, all slightly deflected, 

 scarcely curved : leaves green and glabrous above, glaucescent 

 beneath and there villous along the veins, the rachis similarly 

 villous, but scarcely prickly or gland-bearing; stipules small, 

 entire, obscurely villous-margined ; leaflets 5 or 7, small for 

 the plant, sessile, the terminals elliptic, laterals narrowly oval, 

 all lightly closely and evenly serrate : peduncles and the whole 

 calyx more or less obviously beset with short stout strongly 

 gland-tipped bristles, but otherwise glabrous : fruit small for 



the plant, depressed-globose, the sepals persistent and closely 

 reflexed over it. 



Shrub said to be common in rocky woods in the northwest- 

 ern part of Missouri, as collected by Mr. B. F. Bush, and 

 distributed by him for R, Arkansana, under numbers 160, 

 167, 170, 208, etc., chiefly in the year 1896. It is plainly of 

 the group of R. heliopkila, often flowering like that only 

 corymbosely at the end of a tall shoot of the season ; but this 

 tall shoot becomes a strong woody stem to flower the next 

 year from mostly one-flowered lateral twigs. By characters 



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