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[pen-ee-kres] /ˈpɛn iˌkrɛs/
any of several plants belonging to herbs of the genus Thlaspi, of the mustard family, especially T. arvense, of Europe, bearing somewhat round, flat pods.
Also, penny cress, penny-cress.
1705-15; penny + cress Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for penny-cress


any of several plants of the genus Thlaspi of temperate Eurasia and North America, typically having small white or mauve flowers and rounded or heart-shaped leaves: family Brassicaceae (crucifers)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for penny-cress


((genus Thlaspi), plant of the mustard family (Brassicaceae), named and sometimes grown for its round seedpods. Most of the 60 species are Eurasian, but a few are native to North and South America, mostly in mountain areas. Common pennycress, or field pennycress (T. arvense), has penny-shaped (flattened and circular) notched pods, which are borne on stalks along the spike; at the ends of the spikes are small, white, four-petaled flowers

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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