Oenothera perennis var. perennis(little evening primrose, "Hinamatsuyoigusa")
Japanese name: ヒナマツヨイグサ（雛待宵草） Scientific name:Oenothera perennis var. perennis
[Overview]
A perennial 15–30 cm tall, found in sunny places.
The stem is erect or somewhat prostrate and forms a rosette.
The stem has white hairs, with glandular hairs sometimes mixed in on the upper part.
There are basal leaves and stem leaves.
The stem leaves are simple and alternate, lanceolate to obovate, 3–7 cm long and 0.2–1.2 cm wide, with entire margins.
The leaves on the stem are sessile.
The flowers are solitary in the leaf axils on the upper part of the stem, yellow, 4-petaled, 1–2 cm across, and open from around sunrise.
The ovary has glandular hairs.
The calyx is tinged with red.
The fruit is a club-shaped capsule 0.4–1 cm long, with glandular hairs and 4 narrow wings.
When ripe, the fruit splits into 4 at the tip.
[History]
It was confirmed in Gunma in 1949 and has become naturalized in various places.
