Chrysosplenium echinus ("Iwanekonomeso")

Japanese name: イワネコノメソウ （岩猫目草）
Scientific name: Chrysosplenium echinus

[Overview]
A perennial found in wet ground along streams.
The stolons creep along the ground, and the plant is hairless except at the leaf axils.
The leaves are of two kinds, basal leaves and leaves borne on the flower stalk and stolons; the basal leaves are absent at flowering time.
The leaves on the flower stalk are simple and opposite, fan-shaped to round-reniform, 0.2–0.8 cm long and 0.3–1 cm wide, with 6–10 teeth on the margin.
The stolons emerge from the base of the flower stalk after flowering.
The leaves on the stolons are simple and opposite, round to round-reniform, 0.2–1.8 cm long, with 3–10 sharp teeth on the margin.
The leaves on the stolons become larger toward the tip.
The flower stalk grows 3–12 cm tall.
A cyme is borne at the tip of the flower stalk.
The inflorescence has leaf-like, ovate bracts.
The bracts have 1–2 pairs of teeth and remain green even at flowering.
The flowers are 3–5 mm across and have no petals.
There are 8 stamens, with conspicuous red-orange anthers.
The calyx is sometimes tinged with reddish purple and opens flat.
The fruit is a capsule that splits open when ripe, showing 18–20 seeds.
The seeds are ovate, with club-shaped projections arranged densely.

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