Plants perennial, 3-15 dm; roots also often arising from proximal nodes; rhizomes present. Stems decumbent to erect, usually branched distally, without noticeable ribs, glabrous or, rarely, pubescent distally, sometimes glandular-punctate. Leaves: ocrea light brown, cylindric, 12-23 mm, chartaceous, base inflated, margins truncate, eciliate, surface glabrous, usually obscurely glandular-punctate; petiole 0.2-2 cm, scabrous; blade without dark triangular or lunate blotch adaxially, lanceolate, (10-)15-30 × (1.5-)2-5.4 cm, base tapered, margins glabrous or antrorsely strigose, apex acute to acuminate, faces glabrous or scabrous along midveins, sometimes glandular-punctate. Inflorescences mostly terminal, sometimes also axillary, erect to slightly nodding, usually uninterrupted, 30-100 × 5-9 mm; peduncle 10-50 mm, glabrous or scabrid, glandular-punctate; ocreolae usually overlapping, margins eciliate. Pedicels erect to spreading, 2-5 mm. Flowers (1-)3-8 per ocreate fascicle, homostylous; perianth greenish white to white or pink, glabrous, not glandular-puncate or glandular-punctate with punctae ± uniformly distributed, scarcely accrescent; tepals 5, connate ca. 1/ 3 their length, obovate, 3-3.6 mm, veins not prominent, not anchor shaped, margins entire, apex obtuse to rounded; stamens 5-7, included; anthers pink or red, ovate; styles 2, connate proximally. Achenes included, dark brown to brownish black, biconvex, 2-2.2 × 1.3-1.6 mm, shiny, smooth.
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A herb. It keeps growing from year to year. The leaves are sword shaped and taper to both ends. The leaves are 20 cm long by 4-5 cm wide.
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