''Japonolirion'' is a genus of plants in the family

Petrosaviaceae Petrosaviaceae is a family of flowering plants belonging to a monotypic order, Petrosaviales. Petrosaviales are monocots, and are grouped within the lilioid monocots. Petrosaviales are a very small order (one family, two genera and four species ...

. There is only one known species, ''Japonolirion osense'',

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

.Kew World Checklist of Selected Plant Families
/ref> It is found in grasslands, wetlands and alpine meadows.
/ref>

Description

''Japonolirion osense'' is a herbaceous, perennial plant with subterranean creeping rootstocks. Its green, linear leaves a set in a rosette, and are long and wide, with 7-9 veins, and rough margins. The leaf base encloses the younger leaves. The flowers are facing upwards and are set with 20–40 in a raceme of long, on an inflorescence stalk of long that carries membranous bracts. The flower stalks emerge from shoots that carried leaves during the previous year, so it stands separately from the current leaf rosette. Each flower consists of 6 cream-coloured tepals, the outer 3 about long and the inner about long. There are 6 stamens of about 1.5 mm long, each carrying a yellow anther. At the heart of the flower are three free green carpels that later develop into oval capsules of about 2.5 mm high. Flowering occurs in July and August.

References

Petrosaviales Monotypic monocot genera Endemic flora of Japan {{Monocot-stub