130 BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
fruit insipid or subacid, large, broader than long, becoming 14 mm. 
wide; drupelets very large, up to 8 mm. in diameter, bearing scat- 
tered pilose hairs. 
A single specimen only of this plant was met with, trailing along 
the border of a low thicket in Millbrook Swamp, August 9, 1906. 
It has proved to be a particularly perplexing plant. The very 
large, rounded, and coarsely dentate leaflets of its strictly trifolio- 
late leaves, coarse subherbaceous and nearly unarmed stem, 
clustered leafy branchlets, stiff elongated pedicels, and large 
drupelets give it signal distinction. It can scarcely be doubted 
that it is a hybrid, and unless it be a compound hybrid, I am at a 
loss where else to place it than under the parentage here suggested. 
If a compound hybrid, some involvement with R. Baileyanus or 
R. Enslenu might be suspected. 
* RuBus BAILEYANUS X ENSLENII. 
R. geophilus Bld., in part. 
Ascending, or prostrate and long-trailing, mostly unbranched; 
stems terete, slender, flexuous, varying from soft and subherbaceous 
and nearly unarmed to more woody with rather numerous prickles; 
prickles small, straight and more or less retrorse to rather broad- 
based and decurved; primary leaves in full development 5-foliolate, 
on loosely villous-pubescent to glabrate petioles 5-10 cm. long, 
which are sparsely and weakly or sometimes more strongly armed; 
leaflets bearing scattered, loosely appressed hairs on the upper 
surface, thinly short-pubescent beneath, coarsely and acutely 
doubly dentate or dentate-lobed to somewhat crenately doubly 
dentate; the odd one ovate- Witmer with rounded or subcordate 
base, to rhombic-ovate, acuminate to lanceolate-attenuate, its 
stalk 1.5-4 cm. long; the peal leaflets often on short petiolules 
and, on trifoliolate leaves, usually cleft to form a basal lobe; 
leaves of the flowering branches on slender petioles mostly 2.5 cm. 
long, their leaflets ovate to rhombic-oblong, rarely orbicular, 
variously dentate-lobed; unifoliate leaves coarsely dentate or 
incised, often 3-lobed, not rarely cordate, sometimes 4-5 cm. 
broad; inflorescence a short racemose corymb of 3-5 flowers on 
elongated slender pedicels; often also solitary flowers from the 
lower axils; pedicels subtended by conspicuous unifoliate or 
trifoliolate leaves, the two terminal pedicels arising from the 
axil of a single leaf, all erect, 3-10 cm. long, loosely or thinly 
villous-pubescent, naked or bearing minute scattered prickles 
and frequently short gland-tipped hairs, which sometimes extend 
