This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The habitat of this plant is hedges, thickets in the S. The habit is climbing, twining. The stem is wiry, furrowed, round or angled. The leaves are heart-shaped, arrow-shaped. The outer perianth - segments are broadly winged. The flower-stalks are hair-like, slender, jointed below the middle. The nut is small, smooth, highly polished. The plant is 2-3 ft. high, flowering between July and September, and is a herbaceous annual.
Rumex acutus L. ( = R. pratensis, Mert. et Koch). - The habitat of this species is roadsides, marshy places. It is similar in habit to R. obiusifolius, with narrower leaves. The stem is tinged with red. The radical leaves are linear, oblong to lance-shaped, wavy, heart-shaped below, acute. The panicle is leafy below, the whorls close, not crowded. The inner fruiting sepals or perianth-segments are unequal, heart-shaped, triangular, shortly toothed below, with a small, entire, triangular point, the upper tubercled, the tubercle egg-shaped or lance-shaped. The anthers are white before they open. The nutlets are numerous, elliptic. The plant is 2-3 ft. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this species is roadsides, hedges, wooded places, waste places. The habit is as in the last. The stem is slender, ascending, simple or little branched. The leaves are egg-shaped, lance-shaped, the lower heart-shaped, fiddle-shaped, a little wavy, with red nerves. The leaf-stalk is black, short. The panicle is leafy below, loose, with distant, many-flowered whorls. The flower-stalks equal the perianth-segments, and are jointed below. The inner fruiting sepals are oblong, blunt, with a round base, entire, one, the outer, larger, with a large bright-red, smooth, nearly round tubercle, broadest above the middle. The nut is brown, drooping, egg-shaped to elliptic, shining. The plant is 1-3 ft. high, flowering between July and October, and is a herbaceous perennial.
The habitat of this plant is roadsides, near cottages. The habit is as in the last. The rootstock is stout. The plant is downy, with cellular hairs. The stem is stout. The leaves are broadly egg-shaped or rounded to heart-shaped, blunt, with wavy borders, the upper egg-shaped. The leaf-stalk is long, stout, channelled. The panicle is leafy below, with numerous, erect branches, the whorls crowded, numerous. The inner fruiting sepals are triangular to egg-shaped, net-veined, membranous, entire or toothed, with no tubercles. The flower-stalks are twice as long, jointed below the middle. The nut is elliptic, grey. The plant is 2-4 ft. high, flowering in July, and is a herbaceous perennial or biennial.