BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 127 
membranous, dull green and sparsely subappressed-hirsutulous 
on the upper surface, paler beneath and glabrous or obscurely 
pubescent along the veins, the primary veins few with broad inter- 
spaces; leaflets broad, 3-6.5 cm. wide, 4-6 cm. long, the odd one 
often wider than long, abruptly contracted to a short, often 
curved acumination, broadly rounded or subcordate at the base; 
middle pair of leaflets similar but inequilateral, all more or less 
distinctly crenate-lobed, the lobes dentate with erect, site) 
acuminate teeth; flowering branchlets slender, 5-15 cm. long, 
glabrous, iinarmed or sometimes sparingly setulose, often leafy 
towards the base and in the inflorescence and having an elongated 
naked interval, leaves trifoliolate, on slender, glabrous or thinly 
pubescent petioles 2-4 cm. long, usually weakly setulose; leaflets 
on the flowering branches often purple, small, mostly ovate or 
obovate and rhombic, the odd one often cuneate, on a very slender 
stalk 5-10 mm. long, firm and membranous, narrowly cleft into 
numerous Close, acutely denticulate lobes, or even subpalmatisect, 
the margins often crisped; inflorescence a loose subcorymbose 
raceme of slender-pediceled flowers, the lower subtended by one 
or more trifoliolate leaves, and one or all of the others by small 
unifoliate leaves; pedicels very slender, 1-4 mm. or even 6 mm. 
long, glabrous or obscurely puberulent, unarmed or bearing weak 
purplish bristles and often also minute, scattered, sessile or short- 
stalked, purplish glands; calyx lobes glabrous to puberulent, 
canescent-tomentulose within, usually caudate or with foliaceous 
termination; flowers often small; petals oblong, 0.75-1.5 cm. 
long; fruit apparently rather small and seedy. 
In open sandy places, sometimes in pure white sand. South 
of the town, June 10, 1909, not yet in bloom; Gibbs’ Pond, June 18, 
1908, just in flower; Quidnet, June 20, 1910, just in flower; Beech- 
wood farm, June 26, 1910, just in flower; Gibbs’ Pond, August 7, 
1906, ripe fruit. 
A very distinct appearing blackberry and perhaps exclusively 
a Nantucket plant. I have seen nothing like it from anywhere else. 
While some of its phases seem to point to close relationship with 
Rubus flagellaris, suggestions of Rubus hispidus are not to be over- 
looked, and I have found the three plants growing together. It 
is therefore here proposed as a hybrid, but I am even less satisfied 
than in certain other cases as to its parentage or even that it may 
not be a valid species. 
* RusBus BAILEYANUS X PROCUMBENS. 
R. procumbens var. roribaccus Bailey. 
