Sweet 16 checklist pdf habit it resembles the Iris. It consists of tufts of basal leaves that rise from a spreading rhizome.
The leaves are erect yellowish-green, radical, with pink sheathing at their bases, sword-shaped, flat and narrow, tapering into a long, acute point, and have parallel veins. The leaves have smooth edges, which can be wavy or crimped. Only plants that grow in water bear flowers. The solid, triangular flower-stems rise from the axils of the outer leaves. A semi-erect spadix emerges from one side of the flower stem. The spadix is solid, cylindrical, tapers at each end, and is 5 to 10 cm in length.
A covering spathe, as is usual with Acoraceae, is absent. The spadix is densely crowded with tiny greenish-yellow flowers. Each flower contains six petals and stamens enclosed in a perianth with six divisions, surrounding a three-celled, oblong ovary with a sessile stigma. The flowers are sweetly fragrant. In Europe, it flowers for about a month in late spring or early summer, but usually does not bear fruit.
The fruit is a berry filled with mucus, which when ripe falls into the water and thus disperses. Even in Asia, it fruits sparingly, and propagates itself mainly by growth of its rhizome, forming colonies. The branched, cylindrical, knobby rhizome is the thickness of a human finger and has numerous coarse fibrous roots below it. The exterior is brown and the interior white. Sweet Flag is native to India, central Asia, southern Russia and Siberia, and perhaps Eastern Europe.