( 325 .) 
RO'SA* * 
Linnean Class and Order. Icosa'ndria f, Polycy'nia. 
Natural Order. Rosa'ceasJ, Juss. Gen. PI. p. 334. — Sm.Gram. 
of Bot. p. 171. — Lindl. Syn. p. 88. ; Introd. to Nat. Syst. of Bot. 
p. 81. — Rich, by Macgilliv. p.528. — Loud. Ilort. Brit. p. 512. ; 
Arbor, et Frutic. Brit. v. ii. p. 670. — Don’s Gen. Syst. ofGard. and 
Bot. v. ii. p. 523. — Mack. FI. Hibern. p. 85. — Hook. Brit. FI. (4th ed.) 
p. 404. — Rosales; sect. Rosin.e; subsect. Rosian.e ; type, Ro- 
sace.e ; subtype, Rosida:; Burn. Outl. of Bot. v. ii. pp. 614, 
683, 699, & 704. — Senticosa?, Linn. 
Gen. Char. Calyx (see fig. 1.) inferior, of 1 sepal; tube urn- 
shaped, contracted at the mouth, permanent, finally succulent ; 
limb in 5 deep, egg-spear-shaped, pointed, concave, imbricated, 
permanent or deciduous segments ; either all simple, or 2 of them 
pinnate with leafy appendages on both sides ; 1 on one side only, 
the other 2 naked on both sides. Corolla (fig. 2.) of 5, inversely 
heart-shaped, deciduous petals, about as long as the segments of 
the calyx, and attached by broad claws to the rim of its tube. 
Filaments (fig. 3, a.) numerous, hair-like, much shorter than the 
petals (see fig. 1.), attached to the rim of the calyx within the 
corolla. Jlnthers roundish, flattened, of 2 oblong tumid lobes. 
Germens (see figs. 3, 5, & 6.) numerous, oblong, inserted on the 
inside of the tube of the calyx, interspersed with dense silky hairs. 
Styles (see figs. 5 & 6.) 1 to each germen, lateral, smooth or hairy, 
all passing through the contracted mouth of the calyx ; in some 
cases united into a cylinder (see figs. 3 & 5). Stigmas blunt. Fruit 
(figs. 7 & 8.) globose or egg-shaped, formed of the permanent, 
pulpy, coloured tube of the calyx, closed at the summit, and con- 
taining numerous, oblong, angular, hard, bristly seeds (aclienia, 
Lindl.j, interspersed with rigid hairs. 
The urn-shaped, fleshy calyx, contracted at the orifice, and termi- 
nating in 5 segments ; its tube lined with hairs, and with numerous 
bristly seeds ; will distinguish this from other genera in the same 
class and order. 
Nineteen species British. Hook. Brit. FI. 
RO'SA ARVE'NSIS. Field Dog-Rose. Trailing Dog-Rose. 
White-flowered Dog-Rose. 
Spec. Char. Shoots trailing. Prickles hooked ; those on the 
root-shoots few, scattered. Leaflets simply serrated, glaucous be- 
neath, their disk without glands. Segments of the calyx sparingly 
pinnate, deciduous. Styles united, smooth. 
Engl. Bot. t. 188. — Hook. Fl. Lond. t. 123. — Iluds. FI. Angl. 1st edit. p. 192, 
and 2nd edit. p. 219. — Linn. Mant. 2, p. 245. — Willd. Sp. PI. v. ii. pt. ii. p. 1066. — 
Sra. Fl. Brit. v. ii. p. 538 ; Engl. Fl. v. ii. p. 396. — With. (7th ed.) v. iii. p. 611. — 
Gray’s Nat. Arr. v. ii. p. 574. — Woods in Trans. Linu. Soc. v. xii. p. 232. — Lindl. 
Fig. 1. Calyx. — Fig. 2. Corolla. — Fig. 3. A vertical section of the Calyx; 
a. Stamens; b. Pistils. — Fig. 4. A Stamen. — Fig. 5. The Pistils, united into a 
column. — Fig. 6. A separate Pistil. — Fig. 7. A Fruit. — Fig. 8. Vertical section of 
ditto.— Fig. 9. A Seed. 
* From the Celtic Mhos, red ; in reference to the colour of the flowers of most 
of the species. Don. — The Rose is the national badge of England. 
+ See folio 100, note t. t See folio 313, a. 
