Cordate

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1. a leaf base that extends in a curving, dual lobe-like fashion below the top of the petiole; heart-shaped.
2. heart-shaped.

cd0238-59.jpeg

cordate.gif

Comparison of leaf bases.
Source: http://hvp.osu.edu/hcs300/glossary/leafpart.htm#base

cord.JPG

Comparison of leaf shapes.
Source: http://hvp.osu.edu/hcs300/glossary/LFSHAPE.HTM

cordate_leaf_base01web400gf.jpg

Cordate, or heart-shaped leaf base.
Source: http://www.uwgb.edu/biodiversity/herbarium/trees/glossary_for_trees01.htm