1a. Sparganium stoloniferum subsp. stoloniferum
黑三棱(原亚种) hei san leng (yuan ya zhong)
Sparganium ramosum Hudson subsp. stoloniferum Buchanan-Hamilton ex Graebner in Engler, Pflanzenr. 2(IV. 10): 14. 1900; S. arcuscaulis D. Yu & G. T. Yang; S. erectum Linnaeus subsp. stoloniferum (Buchanan-Hamilton ex Graebner) H. Hara; S. multiporcatum D. Yu.
Panicles 20-60 cm, each branch with 7-11 male heads. Anthers 1-1.2 mm. Fruit 6-9 mm.
Lakes, ponds, swamps, streams; below 3600 m. Gansu, Hebei, Heilongjiang, Hubei, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Shaanxi, Shanxi, Xinjiang, Xizang, Yunnan [Afghanistan, Japan, Kazakhstan, Korea, Pakistan, Russia, Tajikistan, Uzbekistan; SW Asia].
Some specimens from Heilongjiang were respectively described as Sparganium multiporcatum (Bull. Bot. Res., Harbin 11(2): 20. 1991) and S. arcuscaulis (loc. cit.: 37), distinguished either by the female flowers with perianth segments slightly lobate, stigmas 1.5-2 mm, or by the stems arcuate at the upper part, fruit slightly small. They represent local variant individuals rather than distinct taxa.
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 Sparganium erectum subsp. stoloniferum.