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Inflorescence up to 3–4 m. long, lax, branched with a terminal many–flowered raceme and usually many axillary racemes on leafy peduncles below; pedicels 8–25 mm. long, spreading, pubescent; upper bracts linear to lanceolate and 10–20 mm. long, lower bracts ovate and up to 30–40 mm. long; bracteoles usually in upper part of the pedicel, linear, 1·5–4 mm. long.
Corolla 25–35 mm. long, mauve or pinkish purple, split to the base on the back, ± papillose–pubescent outside and pubescent inside on the bottom of the tube; two lateral petals linear, united with middle petals below, but often becoming free to the base; three middle petals soon splitting up at the apex into three ± 6 mm. long lobes.
Rosette–leaves of unflowered plant sessile, ± narrowly oblanceolate, up to 50 x 10cm., acute or acuminate at the apex, attenuate at the base, weakly pubescent on both sides, more densely pubescent on veins beneath; margin serrate to doubly serrate or denticulate; venation protruding beneath.
Filaments linear, somewhat dilated at the base, connate almost to the base and forming a firm tube, papillose mainly towards the base, free from corolla.
Seeds ± broadly elliptic–oblong in outline, compressed, narrowly winged along one margin, 0·6–0·7 mm. long, finely striate, pale brown.
Capsule obovoid to subspherical, 10–15 mm. long, 10–nerved, weakly pubescent or glabrescent with two short valves.
Calyx–lobes narrowly triangular, flat, 10–16 mm. long, weakly pubescent on both sides, entire.
Anther–tube 6–7 mm. long, all anthers glabrous at the apex, but sparsely pilose on the back.
Plant 2–6 m. tall in flower, ± erect, suckering from the base.
Stem 4–8 cm. thick at base, terete, hollow, pubescent above.
Hypanthium obovoid, 10–nerved, ± pubescent.
Ovary subinferior.
