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Lathyrus japonicus
''Lathyrus japonicus'' (common names sea pea, beach pea, circumpolar pea and sea vetchling) is a legume native to temperate coastal areas of Asia, Europe, and North and South America.
It is a herbaceous perennial plant growing trailing stems to 50–80 cm long, typically on sand and gravel storm beaches. The leaves are waxy glaucous green, 5–10 cm long, pinnate, with 2-5 pairs of leaflets, the terminal leaflet usually replaced by a twining tendril. The flowers are broad, with a dark purple standard petal and paler purple wing and keel petals; they are produced in racemes of up to twelve flowers.
==Description==
''Lathyrus maritimus'' is a perennial plant. The stem grows to and is limp, has no wings and is often hairless. The leaves are alternate, greyish green and somewhat succulent, almost stalkless with large, wide stipules. The leaf blades are pinnate with three to five pairs of narrow lanceolate leaflets with blunt tips, entire margins and a terminal tendril. The inflorescence has a long stem and five to twelve purple flowers, each long, turning bluer as they age. These have five sepals and five petals and are irregular with a standard, two wings and a fused keel. There are ten stamens and a single carpel. The fruit is a long brown pod up to in length. This plant flowers in mid-to-late summer (July and August in the Northern Hemisphere, January and February in the Southern Hemisphere).〔(【引用サイトリンク】title=Sea pea: ''Lathyrus maritimus'' )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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