BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 125 
unifoliate leaves in the inflorescence, the leaflets elliptic to obo- 
vate-oblong or cuneate-obovate, blunt or acute, serrate to unequally 
cut-serrate; inflorescence varying from a short terminal subcorym- 
bose cluster of a few flowers to a loose and elongated leafy raceme; 
pedicels slender, rather densely pubescent, unarmed or sparsely 
slender-setulose, occasionally with an obscure glandular hair; 
calyx lobes thinly to rather densely subappressed-pubescent, 
non-glandular and unarmed; petals oblong to obovate-oblong, 
often small but becoming 10 mm. long, sometimes pinkish tinged. 
Bank at Reed Pond, June 18, 1910, just in flower: season’s 
shoots erect, 7 dm. high; flowering stems prostrate and long- 
trailing; leaves firm and deep green, shining above; inflorescence 
an elongated leafy raceme. 
This seems to be an exceedingly variable cross. Certain speci- 
mens collected on Long Island are scarcely to be distinguished 
from examples of R. vermontanus Bld., although other specimens 
distributed as R. vermontanus are clearly different and probably 
represent hybrids of R. hispidus with R. canadensis. 
* RusBuUsS ENSLENII X HISPIDUS. 
Low, 3-6 dm. high, erect, often recurving above, or the flower- 
ing stems sometimes declined or even prostrate and trailing, 
usually unbranched; stems slender, terete or slightly angled, 
greenish to brownish purple; prickles weak and bristleform, short, 
I-—3 mm. long, numerous or few or sometimes almost wanting, 
straight and erect or slightly decurved; primary leaves 3-foliolate 
or 5-foliolate, on slender, ascending, loosely pubescent and weakly 
armed petioles 4-6 cm. long, light green and thinly appressed- 
pubescent to glabrate on the upper surface, paler beneath and 
minutely subappressed soft-pubescent, at least on the veins; 
leaflets elliptic-obovate to narrowly obovate-oblong, or the pairs 
oblanceolate, narrowed or contracted to the acuminate or tapering 
apex, gradually narrowed towards the mostly entire base, rather 
finely serrate above or denticulate-serrate or sometimes incised ; 
the odd leaflet mostly 5-7 cm. long, 1.5-3-5 cm. wide, on a petiolule 
5-10 cm. long; flowering branchlets numerous, slender, mostly 
6-12 cm. long, pubescent, unarmed, their trifoliolate leaves rather 
small -and short-petioled, often spreading, the leaflets elliptic 
to obovate-oblong and more or less rhombic, acute or acuminate 
at the apex, mostly narrowed towards the base, serrate or somewhat 
cut-serrate, varying to cuneate, and somewhat crenate-dentate; 
inflorescence a short pubescent raceme of close, slender, finally 
widely spreading pedicels, subtended by greenish bracts, or the 
