116 BIcKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
* RUBUS ARGUTUS X BAILEYANUS. 
Shoots erect or ascending, sometimes becoming over a meter 
in height, finally recurved or even declined, widely branched, the 
branches often elongated and trailing; stems stout and angled 
below, terminally becoming slender and_ subterete, usually 
deep reddish purple, strongly armed throughout; prickles mostly 
purplish, very numerous, often crowded, becoming 7 mm. long, 
commonly nearly straight and slenderly very acute, the base 
abruptly broadened, erect or slightly retrorse, often shorter, 
stouter, and decurved towards the ends of the branches and on 
the petioles; leaves rather dark green, often shining above, and 
of thickish texture, those of the main stem 5-foliolate, except the 
lowest; the leaflets somewhat irregularly dentate-serrate, sparsely 
hispidulous-pubescent on the upper surface, slightly pubescent 
beneath; odd leaflets broadly oval to oblong-ovate or obovate- 
oblong, acuminate, subcordate or rounded at the base, mostly 
5-6 cm. wide, 6-8 cm. long, on a petiolule 1.5-3 cm. in length; 
middle leaflets mostly obovoid-oblong, contracted or narrowed to 
a short petiolule 2-10 mm. long; flowering branchlets numerous, 
pubescent, leafy, the leaflets often large and more coarsely and 
irregularly cut than in the primary leaves; inflorescence corymbose 
or doubly corymbose, subtended by one or two conspicuous 
unifoliate leaves, the lower flowers axillary from trifoliolate 
leaves; pedicels firm, slender, often branched, divergent, 1-3 cm. 
long, pubescent but without glandular hairs, well armed oS 
slender slightly recurved prickles; flowers conspicuous, 2.5—3. 
wide, the petals broadly cuneate-obovate, sometimes broader hen 
long; calyx lobes tomentulose-pubescent, non-glandular, commonly 
with narrow subfoliaceous terminations; fruit abundant, of 
medium size, subglobose, I-1.5 cm. broad; drupelets of good size, 
very black and shining. 
Low grounds below the ‘Cliff,’ several vigorous clusters; in 
full flower June 23, 1910. Frequent in local colonies on Long 
Island. 
A handsome and strongly characterized blackberry, usually 
found growing with R. argutus, R. Baileyanus, and R. procum- 
bens, the two former species appearing to be its most probable 
parents. 
* RUBUS ARGUTUS X PROCUMBENS. 
Stems rigid, woody, angled and strongly armed, or in slender 
forms subterete, often more or less pilose-pubescent the first year, 
erect or ascending and recurving, sometimes trailing, becoming 
