Final review of key morphological terms.
a. Rachis: The common axis in a pinnately compound leaf.
b. Pulvinus: The swollen leaf base in some legumes.
c. Pedicel: The stalk of a flower.
d. Thalamus: The swollen end of the pedicel where floral whorls are arranged.
e. Staminode: A sterile stamen.
f. Pericarp: The wall of the fruit.
g. Coleoptile: The sheath enclosing the radicle in a monocot embryo.
