126 BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
lower by unifoliate or trifoliolate leaves; pedicels and calyx 
subtomentulose, either unarmed or sparsely setulose, usually 
bearing short gland-tipped hairs; calyx lobes ovate, green-apicu- 
late; flowers rather small, the petals narrowly oblong to obovate, 
0.75-1.25 cm. long; fruit subglobose, I-1.5 cm. long and wide, 
drupelets large, becoming 5 mm. in diameter, red or tardily black, 
but quite edible while red. 
A very local plant of low grounds on Long Island, beginning 
to flower in the first and second weeks of June, the fruit 
ripening about the middle of August. On Nantucket a single 
plant was collected in sandy low ground below the “‘ Cliff,’ bearing 
unripe fruit on August 4, 1906. This, while closely similar to 
Long Island specimens, differs in its smaller primary leaves with 
shorter more abruptly acuminate and more coarsely dentate- 
serrate leaflets, the leaflets of the flowering stems cuneate-obovate 
and crenate. 
In habit and character this blackberry stands out rather 
notably from any other known to me. Its distinctive appearance 
might seem to give it standing as a valid species, but so it is 
with many another blackberry hybrid; and the very local occur- 
rence of this plant on Long Island and the discovery of only a 
solitary individual on Nantucket would scarcely lend support 
to any other view than that it is of hybrid origin. Even so I am 
not at all assured that its parents have been correctly surmised. 
Actually the plant seems to bear more the suggestion of Rubus 
nigricans than of either of the species suggested as its progenitors, 
yet I have never found it in association with this species as I have 
with the others, and, furthermore, there seems to be no unknown 
cross of Rubus nigricans to which it might be referred, unless some 
one of these crosses has been misinterpreted. 
* RUBUS FLAGELLARIS X HISPIDUS. 
Prostrate and long-trailing or the new shoots ascending, often 
widely branched and rooting at the tips; stems slender, terete, 
becoming purplish or bright purple, armed with scattered or 
numerous, very slender, straight, and erect or slightly retrorse 
bristles, which are occasionally intermixed with gland-tipped hairs 
towards the base of the stem and sometimes pass into short 
decurved prickles on the older stems and branches; primary leaves 
3-foliolate or 5-foliolate on slender glabrate petioles 4-9 cm. long, 
naked or armed with acicular, retrorse prickles; leaves firm and 
