There are two types of pink wood sorrel, Oxalis articulata (those in this post) and Oxalis debilis. Both are native to South America but can now be found across Japan.
The two are often confused but it's easy to tell which is which. Oxalis articulata is deeper pink and has a dark purple flower center and yellow anthers while Oxalis debilis is paler pink, having a pale yellowish green center and white anthers. Another big difference is in underground systems. Oxalis articulata has underground stems (i.e., rhizomes) like potatoes while Oxalis debilis grows from bulbils. This difference can be seen in Oxalis articulata's Japanese name "imo katabami," which translates into "potato wood sorrel," although poteto's underground stems are not rhizomes but tubers.
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イモカタバミ（芋酢漿草、芋片喰）です。紫酢漿草とよく混同されますが、区別は比較的簡単です。先ず、イモカタバミの方がピンクが濃く、花の中心は濃い赤紫色で葯が黄色。対して紫片喰は花びらの色が薄ピンクで、中心部も薄い黄緑色で葯が白です。
もう一つ大きな違いがあります。それは地下。イモカタバミは「塊茎（かいけい）」、ムラサキカタバミは「鱗茎（球根のこと）」で増えます。ちなみに芋片喰の「芋」は、芋のように地下茎で増えるから。ただ、酢漿草の地下茎は根茎（rhizome）、芋の地下茎は塊茎・塊根（tuber）と植物学的には違うようです。なんだか難しいです。。。
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