ROSA in voluta.
Prickly Unexpanded Rose.
o —mmi—
ICOSANDRIA Polygynia.
Gen. Char. Cal. urn-shaped, fleshy, contracted at
the orifice, terminating in 5 segments. Petals 5.
Seeds numerous, bristly, fixed to the inside of the
calyx.
Spec. Char. Fruit globose, very prickly, as well as
the flower-stalks. Prickles of the stem very numerous
and nearly straight. Petals involute and imperfectly
expanded. Leaflets elliptical.
Syn. Rosa involuta. Sm. FI. Brit. 1398.
T h e late Mr. J. Mackay communicated a wild specimen of
this Rose from the Hebrides, which is described in the Flora
Brilannica. The present grew in Cambridge garden, under
the care of its able Curator Mr. James Donn, and was sent
to Mr. Sowerby, June 13th last.
This shrub has the general habit of R. spinosissima, t. 187,
with which the numerous prickles of its stem, various in size
and rarely very slightly curved, agree. But it differs from
that species in having extremely prickly leaf-stalks and flower-
stalks, as well as larger, more elliptical, leaflets, whose ribs
underneath are more generally hairy. The germen inclines to
ovate, and is all over strongly armed with prickles; .whereas
that of the spinosissima is smooth and much depressed. The
calyx-segments are long, simple and pointed, rough externally
with glandular prickles. Petals whitish, variegated
more or less with red, concave and involute, seldom above
half expanded. We have not seen the ripe fruit.
Oct. / f'JonxirOt/Jcrudm.