Acmella oppositifolia var. repens(oppositeleaf spotflower, "Numatsurugiku")
Japanese name: ヌマツルギク（沼蔓菊） Scientific name:Acmella oppositifolia var. repens
[Overview]
A perennial found in wet places such as rice paddies and riverbanks.
The whole plant is covered with fine hairs and is rough to the touch.
The base of the stem creeps along the ground, rooting and spreading, while the upper part stands up to a height of 30–40 cm.
Leaves are simple and opposite, triangular-ovate, with 4–5 pairs of large, uneven teeth on the lower margin.
The leaf surface is glossy, with three conspicuous veins.
The leaf base runs down into the petiole.
A yellow flower head 1–1.5 cm across is borne singly at the tip of a flower stalk about 10 cm long.
The flower head consists of yellow tubular florets and ray florets; there are 8–12 ray florets, 2–3 times as long as the involucral bracts, with tips shallowly 3-lobed.
As flowering progresses, the receptacle rises into a conical to cylindrical shape 1–1.5 cm long.
The fruit is an achene without awns.
[History]
It was confirmed in Fukuoka, Fukuoka in 1975, and has been found naturalized in Honshu from the Kanto region westward and in Kyushu.
