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皋月杜鹃

学名：Rhododendron indicum

科属：杜鹃花科(Ericaceae) 杜鹃花属

皋月就是农历五月的别称，《尔雅·释天》就有「正月为陬，二月为如，三月为寎，四月为余，五月为皋，六月为且，七月为相，八月为壮，九月为玄，十月为阳，十一月为辜，十二月为涂。」日本沿用中国古代为五月的称呼，将这在农历五月开花的杜鹃称为皋月杜鹃。

皋月杜鹃原产日本，半常绿灌木，叶生枝端，狭披针形，叶片较一般杜鹃细小，花1~3朵开于枝端，原种的花红色或桃红色，园艺品种有白色、粉红色、暗红色、紫色等。花萼5裂，淡绿色，花冠5裂，雄蕊5枚，不等长。皋月杜鹃植株低矮，叶片细致小巧，因此非常适合制作盆景。

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摄于东京都立神代植物公园