240 LEAFLETS. 
glabrous and glaucescent above, pale beneath: calyx without 
trace of hairs or acueli, but puberulent. 
Itaska Lake, Minnesota, July, 1901, J. H. Sandberg, n. 1173, 
as in U. S. Herb. 
B. Dacorrca. Stem stout, setose-hispid, with rather soft 
aculeae and hairs; flowering twigs with very few bristles and 
copious soft glandular-viscid hairiness: foliage thin, deep green 
above, whitish tomentulose beneath, also sparsely aculeolate on 
the veins; odd leaflet narrowly somewhat cuneate-obovate, or 
else obovate, 14 to 24 inches long, doubly incise-serrate; pedicels 
and calyx hispid, segments of the latter long, caudate-acuminate. 
Black Hills of S. Dakota, July, 1892, P. A. Rydberg, n. 657, 
as in U. S. Herb. 
B. ACALYPHACEA. Main stem very hispid with stout straight 
prickles; flowering twigs less so, their prickles shorter, slenderer, 
deflexed, with very many unequal hairs intermixed, all strongly 
gland-tipped, the same double indument clothing petioles, 
rachis, and even the midvein of the leaves beneath; odd leaflet 
oval, acute or acuminate, all three incise-serrate, plicate-veined 
above, green beneath, even the veinlets there aculeolate: calyx 
aculeate and grandular-hairy, even to the tips of the long-acumi- 
nate segments. 
Yellowstone Park, 28 July, 1902, E. A. Mearns, n. 2353, as in 
U. S. Herb. Remarkable nettle-leaved species, with strong 
armature. 
B. SUBCORDATA. Less prickly than the last, more glandular 
also glaucous : odd leaflet subcordate-ovate, acute, doubly serrate, 
all white-tomentulose beneath and apt to be aculeolate on the 
veins: calyx more deeply cleft than usual, aculeolate and gland- 
ular-hairy almost throughout: fruits very small, often of but 6 
or 7 drupelets and not equalling the calyx. 
Yellowstone Park, E. A. Mearns, nn. 2553 and 3689, as in 
U. S. Herb, collected July and Sept., 1902. Also Union Pass, 
Wyoming, A. Nelson, n. 997. 
B. LAETISSIMA. Stem without bloom, red-brown, hispid 
with slender weak prickles; twigs and thin delicate foliage all 
