Species in the genus Typha:

Typha australis / Himegama
Typha latifolia / Gama
Typha orientalis / Kogama
　

Typha orientalis / Kogama コガマ

Typha orientalis: Male spike and female ones stick together and resemble another species, Typha latifolia, but the whole is minor. Stems are 1-1.5m in height, and leaves are significantly narrower, approximately 1cm wide. The male spikes measure 3-9cm, and female ends are 10-20cm, about half as long as those of Typha latifolia. Pollen is apart from each other. Bloom time: June-August.