沼生黑三棱 zhao sheng hei san leng

Stems emersed, erect, 33-57 cm tall. Leaves erect, 50-70 cm × 4-5 mm, upper flattened, lower keeled or trigonous on abaxial side. Panicles 7-16 cm, with 1 lateral branch at base, main axis and lateral branch usually zigzag; main axis with 5-8 male heads and 2 or 3 female heads; lateral branch with 3(-5) male and 1 female heads. Male flowers: perianth segments ca. 1.5 × 0.2 mm; filaments 3-4 mm; anthers oblong, ca. 1 × 0.2 mm. Female flowers: perianth segments 1.7-2.5 × ca. 1 mm, serrate-lobate at apex; ovary sessile; styles 1-1.5 mm; stigmas linear, 1-1.2 mm. Fl. and fr. Jun-Sep.

● Swamps; ca. 1800 m. NW Yunnan (Gaoligong Shan).

Govaerts (2010. World Checklist of Typhaceae. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 16 Feb 2010) treats this as a synonym of Sparganium subglobosum.