''Tanakaea radicans'', the Japanese foam flower, is a species of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

in the Saxifrage family, and is the sole species in the genus ''Tanakaea''. It is native to central

Honshu , historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the list of islands by area, seventh-largest island in the world, and the list of islands by ...

and

Shikoku is the smallest of the List of islands of Japan#Main islands, four main islands of Japan. It is long and between at its widest. It has a population of 3.8 million, the least populated of Japan's four main islands. It is south of Honshu ...

in Japan, and to southern

Sichuan Sichuan is a province in Southwestern China, occupying the Sichuan Basin and Tibetan Plateau—between the Jinsha River to the west, the Daba Mountains to the north, and the Yunnan–Guizhou Plateau to the south. Its capital city is Cheng ...

in south-central China. It is named after the Japanese botanist

Tanaka Yoshio was a Japanese civil servant and naturalist. Born to a doctor of Traditional Chinese Medicine in Iida, Shinano Province, Tanaka studied pharmacognosy in his youth with Keisuke Ito. In 1861 he moved to Edo and joined the ''Bansho Shirabesho' ...

. It was initially described by Ludovic Savatier and

Adrien René Franchet Adrien René Franchet (21 April 1834 in Pezou – 15 February 1900 in Paris) was a French botanist, based at the Paris Muséum national d'Histoire naturelle. He is noted for his extensive work describing the flora of China and Japan, base ...

. ''Tanakaea radicans'' propagates via

rhizomes In botany and dendrology, a rhizome ( ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...

similar to the runners of a

strawberry The garden strawberry (or simply strawberry; ''Fragaria × ananassa'') is a widely grown Hybrid (biology), hybrid plant cultivated worldwide for its fruit. The genus ''Fragaria'', the strawberries, is in the rose family, Rosaceae. The fruit ...

. Its preferred habitat in the wild is shady, damp rocky soil.

References

{{Taxonbar, from=Q15233163, from2=Q218930 Saxifragaceae Monotypic Saxifragaceae genera Flora of Japan Flora of Sichuan Plants described in 1873 Taxa named by Adrien René Franchet Taxa named by Ludovic Savatier