Botany online 1996-2004. No further update, only historical document of botanical science!


Leaf Structure - Leaf Base

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)

© Peter v. Sengbusch - Impressum