Stems to 1--2 m, glabrous, base rhizomatous. Petiole 25--40 cm; leaf blade 5--10 × 3.5--6 cm, glabrous. Flowers 1--2 cm in diam.; peduncle 6--10 cm. Perianth dull purple; segments 10--15(--20) × 2--7 mm; petals slightly longer and narrower than sepals, apex obtuse. Stamens 1/2 as long as petals, anthers linear, ca. 4 mm. Fruit 6--10 mm. Seeds 1--2, 2.5--4 × 2--3 mm. Fl. Jun., fr. Oct. 2n = 72, 80.
Leaf blade 3.5-13.5 × 2-8 cm. Flowers ca. 2 cm diam.; perianth parts dull purple, 10-20 × 2-7 mm; petals slightly longer and narrower than sepals. Fruits 6-10 mm. Seeds 1-2, 2.5-4 × 2-3 mm. 2 n = 80.
"Stem to 2 m; lf-blades elliptic, 4–12 cm, half as wide; fls dull purple, on stout peduncles to 15 cm; sep and pet persistent, the latter 12–16 mm, the former somewhat shorter; 2n=80. Quiet water; N.S. and e. Que. to Minn., s. to Fla. and Tex.; also on the Pacific slope, and in tropical Amer., and the Old World. Summer."
Sepals purplish- or brownish- red, elliptic or narrowly oblong, 0.9–1.4 cm. long, 3–6 mm. wide, rounded atthe apex.
Apparently glabrous aquatic with all submerged parts covered with a profuse clear slimy jelly-like mucilage; the outsides of the sepals and petals, the undersurfaces of the leaves, submerged petioles, pedicels, etc., are covered with minute purplish glandular hairs which may secrete this mucilage.
Seeds pale brown, ellipsoid, 2.7–3.5 mm. long, 2–2.3 mm. wide.
Filaments of the stamens filiform, 1 cm. long, papillose; anthers reddish, linear-oblong, 3.5 mm. long, apiculate.
Petals crimson, purplish- or brownish-red, narrowly oblong or linear-oblong, 1.2–1.7 cm. long, 3–4 mm. wide, narrowly rounded at the apex.
Fruiting carpels ellipsoid or fusiform, 0.6–1 cm. long, 2–2.5 mm. wide; stigma persistent.
Carpels fusiform or narrowly ovoid, 5 mm. long, 1.5–2 mm. wide, sparsely papillose; stigma simple, 3–4.5 mm. long, papillose all over save for a narrow longitudinal area facing the perianth.
Leaf-blades round or broadly elliptic, 2.5–11.5 cm. long, 1.5–7 cm. wide, entire, green above, usually reddish-brown or purplish beneath with 12 nerves radiating from the centre; petiole-length depending on the depth of the water, 0.05–1 m. long or more, slender, ±1.5 mm. in diameter.
Pedicels reddish-brown, 4–5 cm. long, 2 mm. in diameter.
Stamens with slender papillose filaments up to 1 cm. long; anthers reddish, 3.5 mm. long, narrowly oblong, apiculate at the apex.
Carpels 5 x 2 mm., narrowly lanceolate-ovoid, sparsely papillose, stigma simple, 3 mm. long, papillose.
Ripe carpels 7 x 2 mm., ellipsoid with a persistent stigma.
Seeds 3.5 x 2.3 mm., ellipsoid, testa pale brown.
Leaves floating, rotund, peltate, 7.5 (10) x 5–7 cm., margin entire, green above, reddish-brown or purplish below, nerves 12, radiating from the apex of the petiole, rather faint, petiole reddish-brown, attached at the centre of the leaf-blade, up to 1 m. or more long according to the depth of the water, c. 1.5 mm. in diam.
Glabrous aquatic plant with all its submerged parts covered with a profuse, clear, slimy mucilage.
Sepals purplish-brownish-red, petaloid, c. 1.4 x 0.3 cm., narrowly oblong, apex rounded.
Flowers solitary, axillary on reddish-brown peduncles up to c. 8 cm. long, c. 2 mm. in diam.
Petals similar to the sepals but slightly larger.
|Water-shield, purple wen-dock, brasénie de Schreber|