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''Claytonia perfoliata'' (Indian lettuce, spring beauty, winter purslane, or miner's lettuce ; syn. ''Montia perfoliata'') is a fleshy annual plant native to the western mountain and coastal regions of North America from southernmost Alaska and central British Columbia south to Central America, but most common in California in the Sacramento and northern San Joaquin valleys. ==Description== ''Claytonia perfoliata'' is a rosette-forming plant, growing to a maximum of 40 cm in height, but mature plants can be as small as 1 cm. The cotyledons are usually bright green (rarely purplish or brownish-green), succulent, long and narrow. The first true leaves form a rosette at the base of the plant, and are 0.5–4 cm long, with an often long petiole (exceptionally up to 20 cm long). The small pink or white flowers have five petals 2–6 mm long; they appear from February to May or June, and are grouped 5–40 together above a pair of leaves that are united together around the stem to appear as one circular leaf. Mature plants have numerous erect to spreading stems that branch from the base. It is common in the spring, and it prefers cool, damp conditions. It first appears in sunlit areas after the first heavy rains. Though, the best stands are found in shaded areas, especially in the uplands, into the early summer. As the days get hotter, the leaves turn a deep red color as they dry out. There are four ill-defined geographical subspecies: * ''Claytonia perfoliata'' subsp. ''perfoliata'': Pacific coastal United States and southwest Canada * ''Claytonia perfoliata'' subsp. ''intermontana'': interior western United States * ''Claytonia perfoliata'' subsp. ''mexicana'': coastal southern California and Arizona south through Mexico to Guatemala * ''Claytonia perfoliata'' subsp. ''utahensis'': recognised as local subspecies in Utah. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Claytonia perfoliata」の詳細全文を読む スポンサード リンク
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