Crop Production Lab 3

Dicotyledon leaves

a petiole is present as well as stipules, they have netted venation

Petiole

leaf stalk, leaves that have this structure are called petiolate leaves

sessile

lack a petiole and are attached directly to the stem

Monocot leaves

blade departs from sheath. parallel venation

sheath

tubular structure around the stem in grasses

collar

junction of the blade and sheath

ligule

membranous structure that projects from the top of the sheath at the collar in grasses.

auricles

earlike apendages that occur at the base of the leaf blade in some grasses.

Simple leaves

one single morphological unit

Compound leaves

include two+ individual leaflets originating from a central axis.

Palmately compounded

radiating from a common point

pinnately compounded

arranged along both sides

opposite arrangement

leaves arise from opposite sides of the same node

alternate arrangement 

located singly on opposite sides of the node at successive nodes

whorled

three or more leaves develop at a node

complete

composed of all four parts (stamen, sepal, petals, pistil)

Incomplete

lacking one or more part 

Perfect

have both stamens and pistils in the same flower

imperfect

incomplete flowers lacking either the stamen or the pistil