BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 131 
into the base of the calyx lobes; calyx lobes rather broad, often 
with subfoliaceous termination, densely to obscurely subappressed- 
pubescent; petals oblong to obovate-oblong, mostly 1.5—2 cm. long, 
young fruit often densely pilose. 
Frequent or common on Nantucket in dry or sandy open 
places or in partial shade. First flowers June 4, 1909, June 7; 
1908; still in full flower June 26, 1910. 
I have referred here a considerable series of specimens from 
Nantucket and Long Island, which, although variably intermediate 
between R. Baileyanus and R. Enslenii possess in general a certain 
recognizable individuality. Certain examples, however, appear 
to be rather arbitrarily separable from R. Baileyanus, while others 
present a similar problem of close relationship to R. Enslenii. In 
general the plant is stouter than R. Enslenii, with much broader, 
more irregularly dentate or lobed leaves and more numerous 
flowers. As compared with R. Baileyanus it is more herbaceous 
and less prickly, with more coarsely and acutely dentate, often 
thicker leaves, and weaker pedicels often wholly unarmed. 
If, as I have inferred, R. roribaccus is a hybrid of R. Baileyanus 
and R. procumbens, the plant here considered would seem to 
answer with the appropriate differences from R. roribaccus that 
might be expected to result if R. procumbens were replaced as a 
parent by R. Enslenit. 
* RUBUS ENSLENII X FLAGELLARIS. 
Low-ascending or prostrate, finally trailing, sparingly branched, 
sometimes rooting at the tip; stems very slender, subterete, un- 
evenly and often very sparsely armed with short, weak, decurved 
or retrorse prickles; primary leaves 3-foliolate, on slender, thinly 
pilose or glabrate petioles, 2—4.5 cm. long; leaflets thin, rather small, 
4-6 cm. long, 3-5 cm. wide, mostly obovate, short-acuminate at 
the apex, ‘more or less cuneate at the base; the lateral pair ine- 
quilateral, often rhombic and lobed on the lower margin, subsessile ; 
the odd leaflet on a stalk 0.5-2 cm. long; all thinly pilose-hirsu- 
tulous on the upper surface, pubescent to glabrate beneath, on 
both surfaces bearing minute glands and often subviscid to the 
touch, irregularly dentate or serrate-dentate with abruptly sharp- 
acuminate teeth, and often obscurely crenate-lobed; leaflets 
of the flowering branches sometimes incised; flowering branch- 
lets rather short, 3-12 cm. long, loosely villous-pubescent, 
unarmed or bearing some minute prickles; inflorescence a 1~-7- 
