Begonia Registration Handbook - American Begonia Society

Leaf Base Definitions
Acute Base: sharply tapering to
a point at the base
Oblique Base: unequally sided
lobes, can be used in conjunction
with other base descriptions.
Oblique Acute Base:
combination of oblique and acute,
meaning sharply tapering to a
point but two sides unequal.
Obtuse Base: rounded or blunt
base with no lobes.
Basal Lobes Spiraled: base
with lobes that curl around to
form a spiral. Can be double
spiraled or spiraled on one side
only. You may wish to expound
on whether it’s double or single
spiraled when using this term.
Basal Lobes Overlapped:
base with the lobes overlapping at
the sinus.
Cordate Base: base with
rounded lobes at the sinus.
Truncate Base: base with no
lobes and blunt at the base, nearly
straight across.
Leaf Shape Definitions
Ovate: oval shaped
Peltate: leaf with petiole
attached to the center of the leaf
with no break in the margin of the
leaf. (Peltate is both a shape
and base decription)
Orbicular: round or nearly
round leaf.
Broadly Ovate: flattened oval
shape.
Oblanceolate: narrow pointed
leaf wider at the top sharply
narrowing at the bottom.
Lanceolate: opposite of
oblanceolate. Narrow pointed
leaf, wider at the bottom, tapering
to a point at the top.
Eliptical: oblong shaped leaf.
Obtrullate: wide diamond
shape.
Narrowly Trullate: long narrow
diamond shape.
Narrowly Triangular: triangle
shape forming less than 45º angle.
Broadly Triangular: triangle
shape of more than 45º angle.
Obovate: oval shape at top
tapering to a point at the base.
Notes:
Use this space to add the
definitions of other shapes and
bases you may come across.
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