BICKNELL: FERNS AND FLOWERING PLANTS OF NANTUCKET 115 
strongly and stoutly armed; prickles numerous, even crowded, 
compressed, straight or strongly hooked, especially on the branches 
and petioles, hard and sharp, often very large, becoming over 
12 mm. long, and abruptly contracted from a widely expanded 
base; new shoots and sometimes the prickles pubescent or even 
villous; primary leaves on stout, strongly armed, often villous 
petioles 5-8 cm. long, 5-foliolate, except the lowest; leaflets rather 
thin becoming coarse and venose, loosely appressed-hairy on the 
upper surface, closely subspreading-pubescent or even velvety 
beneath, ovate-oblong to elliptic or oblong-lanceolate, irregularly 
denticulate or dentate-serrate to cut-serrate with very acute teeth; 
the odd leaflet mostly rounded or subcordate at base ona petiolule 
2-3 cm. long, acuminate at the apex; middle pair of leaflets subses- 
sile or on slender petiolules 1.5 cm. long; inflorescence a leafy, vil- 
lous-pubescent, subcorymbose raceme, the flowers often descending 
to the lower axils, its axis stoutly armed with decurved yellowish 
prickles; pedicels 1-3 cm. long, armed with stout, yellowish, 
straight or decurved prickles, or rarely unarmed, the pubescence 
concealing minute sessile or subsessile glands; unifoliate leaves 
of the inflorescence usually conspicuous, sometimes numerous, 
broadly elliptic to lanceolate; sepals more or less subappressed- 
villose, usually with narrow subfoliaceous termination; petals 
oblong to obovate-oblong, mostly 1-2 cm. long; fruit ovoid, 
medium-sized. 
This plant becomes perhaps the most stoutly armed of all 
our blackberries, and is further characterized by its leafy villous- 
pubescent and strongly armed subcorymbose raceme without 
stalked glands. Ordinarily it has rather small flowers and is not 
over 1.5 m. high. 
Quaise, June 9, 1909, not yet in flower; June 11, 1908, first 
flowers; Watt’s Run, June 20, 1910, just in flower; near Sachacha. 
Frequent on Long Island. 
* RUBUS ARGUTUS X NIGRICANS. 
R. ascendens Bld. 
A few plants at the border of a thicket at Tom Never’s Pond, 
August 31, 1904, bearing some imperfectly developed fruit. An 
erect rather slender form of the plant with straight and spreading 
acicular prickles and contracted inflorescence, its axis, as well as 
the pedicels and calyx lobes, bearing short gland-tipped hairs, 
the pedicels setulose. 
