O. palustris: shrub; stem creeping, wiry; leaves small, evergreen, ovate or lanceolate, the edges rolled back, glaucous beneath; flowers drooping, on long, slender peduncles; the corolla deeply divided into four lobes, which are turned back, exposing the stamens; berry globular, red. - Cranberry. - Peat-bogs. Fl. June, July.
(183) Erica. Heath. * Corolla shorter than the calyx. E. vulgaris: shrub; stems tufted, about a foot high; leaves small, short, opposite, linear, rigid; flowers small, purplish-pink or white, on short pedicels along the upper branches, forming irregular, leafy racemes; calyx coloured like the corolla, which is concealed by it, and is deeply four-lobed. - Ling. - Dry heaths; abundant. Fl. June, July. Now generally separated under the name of Calluna.
** Corolla longer than the calyx.
E. cinerea: shrub; stems one foot or more high, bushy; leaves linear, pointed, three in a whorl, with clusters of small leaves in their axils; flowers numerous, reddish purple, in very showy, dense terminal racemes, the corolla ovoid. - Scotch Heather. - Scotch, Irish, Welsh, and English moors, covering immense tracts. Fl. July to October.
E. Tetralix: shrub; stems about a foot high, bushy at the base, with short, erect flowering branches; leaves in fours, linear, ciliate with short stiff hairs, the branches and upper leaves clothed with a short, whitish down; flowers rose-coloured, ovoid, forming little terminal clusters or close umbels. - Boggy heaths. Fl. July, August.
E. Mackaiana, a plant with shorter and broader leaves of a darker green, from Cunnamara, in Ireland, which is closely related to E. Tetralix, is sometimes regarded as distinct, sometimes as a mere variety.