Japanese name: ハナガサギク（花笠菊） Scientific name:Rudbeckia laciniata ‘Hortensis’
[Overview]
A cultivar of Ohangonso.
A perennial 0.5–3 m tall.
It has creeping underground stems.
The stems branch and are hairless or sparsely hairy.
There are basal leaves and stem leaves.
The basal leaves are deeply bipinnately divided, densely hairy when young, and have long petioles.
The stem leaves are alternate and pinnately divided into 5–7 lobes, with the lobes further divided about halfway; they have long petioles.
On the upper part of the stem the leaves have 3–5 lobes or are simple, and are stalkless.
Both surfaces of the stem leaves are sparsely covered with short hairs.
Flower heads 5–10 cm across are borne facing upward at the stem tips; they consist entirely of yellow ray florets.
[Notes]
It is designated a "Specified Invasive Alien Species" under the Invasive Alien Species Act.
