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pea : ウィキペディア英語版
pea

The pea is most commonly the small spherical seed or the seed-pod of the pod fruit ''Pisum sativum''.〔Oxford English Dictionary - Pea〕 Each pod contains several peas. Pea pods are botanically fruit,〔Rogers, Speed (2007). ( ''Man and the Biological World'' ) Read Books. pp. 169–170. ISBN 978-1-4067-3304-4 retrieved on 2009-04-15.〕 since they contain seeds and developed from the ovary of a (pea) flower. The name is also used to describe other edible seeds from the Fabaceae such as the pigeon pea (''Cajanus cajan''), the cowpea (''Vigna unguiculata''), and the seeds from several species of ''Lathyrus''.
''P. sativum'' is an annual plant, with a life cycle of one year. It is a cool season crop grown in many parts of the world; planting can take place from winter to early summer depending on location. The average pea weighs between 0.1 and 0.36 grams.〔(【引用サイトリンク】title=Pea )〕 The immature peas (and in snow peas the tender pod as well) are used as a vegetable, fresh, frozen or canned; varieties of the species typically called field peas are grown to produce dry peas like the split pea shelled from the matured pod. These are the basis of pease porridge and pea soup, staples of medieval cuisine; in Europe, consuming fresh immature green peas was an innovation of Early Modern cuisine.
The wild pea is restricted to the Mediterranean basin and the Near East. The earliest archaeological finds of peas date from the late neolithic era of current Greece, Syria, Turkey and Jordan. In Egypt, early finds date from ''ca.'' 4800–4400 BC in the Nile delta area, and from ''ca.'' 3800–3600 BC in Upper Egypt. The pea was also present in Georgia in the 5th millennium BC. Farther east, the finds are younger. Peas were present in Afghanistan ''ca.'' 2000 BC, in Harappa, Pakistan, and in northwest India in 2250–1750 BC. In the second half of the 2nd millennium BC, this pulse crop appears in the Gangetic basin and southern India.〔Zohary, Daniel and Hopf, Maria (2000). ''Domestication of Plants in the Old World'', third edition. Oxford: University Press. ISBN 978-0-19-850356-9 p. 105–107〕
==Description==
A pea is a most commonly green, occasionally golden yellow,〔(Pea Golden Podded ), ''The Diggers Club''〕 or infrequently purple〔(Purple podded peas )〕 pod-shaped vegetable, widely grown as a cool season vegetable crop. The seeds may be planted as soon as the soil temperature reaches , with the plants growing best at temperatures of . They do not thrive in the summer heat of warmer temperate and lowland tropical climates, but do grow well in cooler, high altitude, tropical areas. Many cultivars reach maturity about 60 days after planting.
Peas have both low-growing and vining cultivars. The vining cultivars grow thin tendrils from leaves that coil around any available support and can climb to be 1–2 m high. A traditional approach to supporting climbing peas is to thrust branches pruned from trees or other woody plants upright into the soil, providing a lattice for the peas to climb. Branches used in this fashion are sometimes called pea brush. Metal fences, twine, or netting supported by a frame are used for the same purpose. In dense plantings, peas give each other some measure of mutual support. Pea plants can self-pollinate.〔(【引用サイトリンク】title=Dry Field Pea )

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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