BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 123 
is not to be supposed. Such Long Island plants are of casual 
occurrence only and are quite certainly hybrids, apparently crosses 
of different local forms of the same parents that have produced 
the Nantucket plant. The Maine plant, which has been described 
as Rubus arenicolus Bld., is again similar to but not identical with 
the Nantucket plant, forms of which, however, approach it very 
closely. 
* RUBUS ENSLENII X FRONDOSUS. 
Erect and recurved, or ascending and reclined; stems simple or 
sparingly long-branched, purplish tinged, rather soft and becoming 
somewhat wrinkled-striate when dry, sparsely armed with short, 
slightly retrorse weak bristles, or slender and nearly unarmed, or 
again stouter and bearing numerous bristles below and occasionally 
stronger prickles; leaves rather small on slender, unarmed or 
nearly unarmed petioles, 3-foliolate or 5-foliolate; leaflets rather 
light green, ovate-oblong, or rhombic, acute or acuminate at the 
apex, rounded or narrowed at the base, rather coarsely and irregu- 
larly dentate or dentate-serrate, sparsely appressed-pubescent on 
the upper surface, softly and finely pubescent beneath, the lateral 
pair sessile or very short-stalked ; inflorescence rather few-flowered, 
subcorymbose on short leafy branchlets, which are softly sub- 
appressed-pubescent, glandless and unarmed; pedicels very slen- 
der, even flexuous, 1-3 cm. long, the lowest axillary from one or 
two trifoliolate leaves, the one or two next above subtended by 
unifoliate leaves; sepals oval-oblong, blunt-apiculate to subfoli- 
aceous-attenuate, thinly or sometimes softly subappressed-pu- 
bescent, casually with a few very short gland-tipped hairs; flowers 
‘apparently medium-sized; fruit rather small and seedy. 
The description refers to plants collected on the Hempstead 
Plains, Long Island, which are somewhat intermediate between 
R. frondosus and R. Enslenii, but are not fully mature and have 
probably allowed only a very imperfect definition of the hybrid. 
A plant collected on Nantucket, near Shimmo farm, June 7, 1908, 
not yet in flower, seems to belong here but differs from the Long 
Island plant in its stiffer, more woody stem, larger and stronger 
prickles, looser pubescence, and larger but narrower, more coarsely 
cut leaflets. Another Nantucket plant, which may well be a form 
of this cross, occurs about the borders of thickets in dry exposed 
places. It is often erect or nearly so and differs from the Long 
Island plant in its more numerous, stouter prickles, orbicular or 
