pertaining to leaf shape. rounded to approaching semicircular.

Merriam-Webster Online Dictionary
obtuse (adjective)
a) not pointed or - acute blunt
b) (1) of an angle exceeding 90 degrees but less than 180 degrees
(2) having an obtuse angle - an obtuse triangle see triangle illustration
c) of a leaf rounded at the free end
a) lacking sharpness or quickness of sensibility or intellect - insensitive stupid
b) difficult to comprehend not clear or precise in thought or expression dull
obtuse (Wikipedia)

Obtuse may refer to:

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