Sarothra laxa

Family	Hypericaceae (alt. Guttiferae)
Scientific name	Sarothra laxa (Blume) Y. Kimura
Synonyms	Hypericum laxum (Blume) Koidzumi
Common name	(Japanese common name) koke otogiri (コケオトギリ, 苔弟切 [meaning: moss otogiri (otogiri = Hypericum weeds)])
	(English common name) none
Distribution	(Japan) Hokkaido (southwest region), Honshu, Shikoku, Kyushu, Okinawa
	(Other nations) Korea, Himalayas
Habitat	Rice paddy, swamp
Chromosomal number	2n=16
Description	Plants 5-30cm tall. Leaves 3-9mm long, 3-7mm wide. Flowers yellow 5-7mm across, 5-10 stamens, flowering in June to September. Annual or perennial plants.
Note	Flower of Hypericum japonicum Thunberg (Sarothra japonica (Thunb.) Y. Kimura) has each 10-20 stamens.
	Author of Flora of China describes that Sarothra laxa (Blume) Y. Kimura is a synonym of Hypericum japonicum Thunberg (Sarothra japonica (Thunb.) Y. Kimura). See Hypericum japonicum Thunberg in Flora of China. If Sarothra laxa (Blume) Y. Kimura is a synonym of Hypericum japonicum Thunberg then synonyms of Sarothra laxa (Blume) Y. Kimura are: Brathys japonica (Thunberg) Wight; Brathys laxa Blume; Hypericum cavaleriei H. Léveillé; Hypericum chinense Osbeck, non L.; Hypericum japonicum Thunberg var. calyculatum R. Keller; Hypericum japonicum Thunberg var. cavaleriei (H. Léveillé) Koidzumi; Hypericum japonicum Thunberg var. maximowiczii R. Keller; Hypericum japonicum Thunberg var. thunbergii (Franchet & Savatier) R. Keller; Hypericum laxum (Blume) Koidzumi; Hypericum nervatum Hance; Hypericum thunbergii Franchet & Savatier; Sarothra japonica (Thunberg) Y. Kimura; S. laxa (Blume) Y. Kimura

July 2007 at rice paddy	July 2007 at rice paddy	July 2007 at rice paddy

July 2007 at rice paddy	July 2007 at rice paddy

September 2006 at rice paddy