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Stipules: to the left:
lateral excrescences of the leaf base.
Leaf base formed like an open sheath:
middle picture: Hogweed or Cow-Parsey (Heracleum
sphondylium)
Sessile leaves: to the right: The lower leaves of Buckwheat (Fagopyrum esculentum)
have petioles with stipules, the upper leaves are sessile
Sessile, sheating leaves: The
leaf base surrounds the stem partly or completely: middle picture:
Pea (Pisum sativum);
to the right: Welsh Poppy
(Meconopsis cambrica)
Connate: The base of two
opposite leaves are grown together at the node: to teh right:
Honeysuckle (Lonicera implexa)
Auriculate: The leaf base has
two small ear-like projections: to the left: Prickly Lettuce
(Lactuca serriola)
Perfoliate: The base of the
leaf blade surrounds the stem so that it seems as if the stem would
grow through the leaf blade. middle left picture: Honeysuckle
(Lonicera implexa), top pair of leaves
Leaves with petioles: Typical
for most flowering dicots. middle right picture: Honeysuckle, lower
leaves (same plant as in the preceding picture and in the picture to
the right in the row above). Base of leaf blade runs down the leaf
stalk.
Base of leaf blade runs down the leaf
stalk. (right picture)
