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{{Taxobox
| color = lightgreen
| name = ''Lathyrus japonicus''
| image = Beach pea.jpg
| image_width = 240px
| regnum = [[Plant]]ae
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Dicotyledon|Magnoliopsida]]
| ordo = [[Fabales]]
| familia = [[Fabaceae]]
| subfamilia = [[Faboideae]]
| tribus = [[Vicieae]]
| genus = ''[[Lathyrus]]''
| species = '''''L. japonicus'''''
| binomial = ''Lathyrus japonicus''
| binomial_authority = [[Carl Ludwig Willdenow|Willd.]]
}}
'''''Lathyrus japonicus''''' ([[synonymy|syn.]] ''L. maritimus''; common names '''Sea Pea''', '''Beach Pea''', '''Circumpolar Pea''', '''Sea Vetchling''') is a [[legume]] native to temperate coastal areas of [[Asia]], [[Europe]], [[North America|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 [[leaf|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 [[flower]]s are 14-22 mm broad, with a dark purple standard petal and paler purple wing and keel petals; they are produced in [[raceme]]s of 2-7 together.
The unusually extensive native range is explained by the ability of the [[seed]]s to remain viable while floating in [[sea water]] for up to 5 years, enabling the seeds to drift nearly worldwide. Germination occurs when the hard outer seed coat is abraded by waves on sand and gravel.
The pods can be eaten but like many members of the genus ''[[Lathyrus]]'' they contain β-oxalyl-''L''-α,β-diaminopropionic acid, which can cause paralysis called [[lathyrism]]. The leaves of the plant are used in Chinese traditional medicine.
==References==
*[http://linnaeus.nrm.se/flora/di/faba/lathy/lathjapv.jpg Den virtuella floran: ''Lathyrus japonicus'' distribution]
<gallery>
Image:Lathyrus_japonicus_2.jpg|Whole plant
Image:Lathyrus_japonicus_1.jpg|Flowers
Image:Lathyrus japonicus, Pancake Bay PP.jpg|[[Pancake Bay Provincial Park|Pancake Bay sand dunes]], [[Ontario]], [[Canada]]
</gallery>
{{legume-stub}}
[[Category:Edible legumes]]
[[Category:Faboideae]]
[[Category:Flora of Canada]]
[[Category:Poisonous plants]]
| color = lightgreen
| name = ''Lathyrus japonicus''
| image = Beach pea.jpg
| image_width = 240px
| regnum = [[Plant]]ae
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Dicotyledon|Magnoliopsida]]
| ordo = [[Fabales]]
| familia = [[Fabaceae]]
| subfamilia = [[Faboideae]]
| tribus = [[Vicieae]]
| genus = ''[[Lathyrus]]''
| species = '''''L. japonicus'''''
| binomial = ''Lathyrus japonicus''
| binomial_authority = [[Carl Ludwig Willdenow|Willd.]]
}}
'''''Lathyrus japonicus''''' ([[synonymy|syn.]] ''L. maritimus''; common names '''Sea Pea''', '''Beach Pea''', '''Circumpolar Pea''', '''Sea Vetchling''') is a [[legume]] native to temperate coastal areas of [[Asia]], [[Europe]], [[North America|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 [[leaf|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 [[flower]]s are 14-22 mm broad, with a dark purple standard petal and paler purple wing and keel petals; they are produced in [[raceme]]s of 2-7 together.
The unusually extensive native range is explained by the ability of the [[seed]]s to remain viable while floating in [[sea water]] for up to 5 years, enabling the seeds to drift nearly worldwide. Germination occurs when the hard outer seed coat is abraded by waves on sand and gravel.
The pods can be eaten but like many members of the genus ''[[Lathyrus]]'' they contain β-oxalyl-''L''-α,β-diaminopropionic acid, which can cause paralysis called [[lathyrism]]. The leaves of the plant are used in Chinese traditional medicine.
==References==
*[http://linnaeus.nrm.se/flora/di/faba/lathy/lathjapv.jpg Den virtuella floran: ''Lathyrus japonicus'' distribution]
<gallery>
Image:Lathyrus_japonicus_2.jpg|Whole plant
Image:Lathyrus_japonicus_1.jpg|Flowers
Image:Lathyrus japonicus, Pancake Bay PP.jpg|[[Pancake Bay Provincial Park|Pancake Bay sand dunes]], [[Ontario]], [[Canada]]
</gallery>
{{legume-stub}}
[[Category:Edible legumes]]
[[Category:Faboideae]]
[[Category:Flora of Canada]]
[[Category:Poisonous plants]]