114 BicKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 
petiolules thinly pubescent with loosely spreading hairs; leaflets 
often dark green, somewhat shining and sparingly appressed- 
pubescent to glabrate above, minutely pubescent beneath, acutely 
and unequally dentate or dentate-serrate; the lateral veins rather 
numerous, becoming prominent, the odd leaflet ovate to ovate- 
oblong, acuminate, cordate at the base, its petiolule short-pubes- 
cent to tomentulose, 1.5—4 cm. long; middle pair of leaflets oblong 
or somewhat rhomboid, tapering at the apex, somewhat narrowed 
to an entire, inequilateral, abruptly short-contracted, often 
cordate base, subsessile or short-stalked; trifoliolate leaves of the 
flowering stems often somewhat doubly serrate-dentate or cut- 
lobed; inflorescence corymbose-subracemose, naked or sparingly 
unifoliate-bracteate, sometimes slightly compound, terminating 
numerous leafy branchlets 5-20 cm. long, which do not usually 
extend into the terminal portion of the stem; pedicels slender, 
erect or spreading, 2-6 cm. long, thinly pubescent to tomentulose, 
unarmed or sparingly setulose, with the calyx bearing delicate 
gland-tipped purplish hairs of unequal lengths; calyx lobes oblong 
to lanceolate, short-tipped or caudate; flowers often rather small, 
becoming 2.5 cm. wide or wider; petals broadly oblong or obovoid; 
fruit rather small, ovoid or subglobose, the drupelets medium- 
sized. 
Found at one locality near Wauwinet, and a single plant 
in Millbrook Swamp. First flowers June 11, 1909; in full flower 
June 20, 1910. Frequent on Long Island. In some of its forms 
this plant approaches so closely to forms of R. allegheniensis X 
frondosus that in the present state of our knowledge confident 
assignment of all specimens is scarcely possible. In general it 
differs from R. allegheniensis < frondosus in its more prostrate 
and slenderly trailing habit; smaller and more slender, more num- 
erous prickles, often mixed with gland-tipped hairs or bristles; 
firmer, darker green, strongly venose leaflets, which are less 
densely pubescent beneath and more evenly dentate with shorter 
teeth, the middle pair often cordate; slender and flexuous, more 
numerous flowering branchlets, often wanting towards the upper 
part of the stem; more corymbose and glandular, often naked, 
inflorescence of slender-pediceled flowers. 
* RUBUS ARGUTUS X FRONDOSUs. 
Stout, erect, recurving above, becoming widely branched the 
second year; stem and branches yellowish green to dull purple, 
rigidly flexuous, angled and sulcate, or the branches subterete, 
