
Papilionaceous is a flower from the Papilionaceae family (as in the bean or pea) with a corolla, usually with five petals that include a large upper petal, the vexillum(standard petal), enclosing two lateral wings resembling a butterfly and a lower keel petals which are united.The characteristic aestivation of this flower is vexillary imbricate. ....
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http://en.wikipedia.org/wiki/Papilionaceous

pea-flowered; flowers which are zygomorphic with imbricate petals, one broad upper one, two narrower lateral ones and two narrower lower ones, the latter usually coherent or connate by their margins; the flowers of Papilionaceae
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http://florabase.dpaw.wa.gov.au/help/glossary

of, like or pertaining to butterflies
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http://phrontistery.info/p.html

• (a.) Belonging to that suborder of leguminous plants (Papilionaceae) which includes the bean, pea, vetch, clover, and locust. • (a.) Resembling the butterfly. • (a.) Having a winged corolla somewhat resembling a butterfly, as in the blossoms of the bean and pea.
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http://thinkexist.com/dictionary/meaning/papilionaceous/

describing the structure of a corolla typical of the Fabaceae with banner, wings and keel
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http://www.calflora.net/botanicalnames/botanicalterms.html

Descriptive of a flower whose petals are arranged to resemble a butterfly.
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http://www.encyclo.co.uk/local/20901

describing the structure of a corolla typical of the fabaceae with banner, wings and keel
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http://www.encyclo.co.uk/local/21767

Butterfly-shaped. A term referring to flowers of legumes.
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http://www.encyclo.co.uk/visitor-contributions.php
Pa·pil`io·na'ceous adjective 1. Resembling the butterfly.
2. (Botany) (a) Having a winged corolla somewhat resembling a butterfly, as in the blossoms of the bean and pea.
(b) Belonging to that suborder of leguminous plants (
Papilionaceæ ) which include...
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http://www.encyclo.co.uk/webster/P/16

papilionaceous 1. Of or pertaining to a butterfly. 2. Belonging to the Papilionaceae family whose plants have petals in the form of a butterfly, mostly legumes, such as peas and beans.
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http://www.wordinfo.info/words/index/info/view_unit/11/4
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