purslane

[purs-leyn, -lin]
noun
1.
a low, trailing plant, Portulaca oleracea, having yellow flowers, used as a salad plant and potherb. Compare purslane family.
2.
any other plant of the purslane family.

Origin:
1350–1400; Middle English purcelan(e) < Middle French porcelaine < Late Latin porcillāgin- (stem of porcillāgō), for Latin porcillāca, variant of portulāca portulaca

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World English Dictionary
purslane (ˈpɜːslɪn, -leɪn)
 
n
1.  a weedy portulacaceous plant, Portulaca oleracea, with small yellow flowers and fleshy leaves, which are used in salads and as a potherb
2.  any of various similar or related plants, such as sea purslane and water purslane
 
[C14 purcelane, from Old French porcelaine, from Late Latin porcillāgō, from Latin porcillāca, variant of portulāca]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

purslane

any of certain small, fleshy annual plants of the genus Portulaca (40-100 species), of the family Portulacaceae. The plants have prostrate, often reddish stems, with spoon-shaped leaves and flowers that open in the sunlight. The common purslane (P. oleracea), or pusley, is a widespread weed, recognizable by its small yellow flowers. P. oleracea sativa, known as kitchen garden pusley, is grown to some extent as a potherb, mostly in Europe. Rose moss (P. grandiflora), a trailing fleshy species, is cultivated as a garden ornamental for its brightly coloured, sometimes doubled flowers. All plants of the genus are known for their persistence; they grow well even in dry waste soil and can retain enough moisture to bloom and ripen seeds long after they have been uprooted. The capsules, which open by a lid, scatter many small seeds of great longevity.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It's no more contradictory to eat a pig but not a dog than it is to eat arugula but not purslane.
Common purslane, horse purslane, ground spurge and spotted spurge are serious weed pests in commercially grown tomatoes.
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