A

auxin :

plant hormone that regulates the amount, type, and direction of plant growth

B

basal :

closest to the point of attachment

bud :

a common term for meristem; the specialized growing region of a plant containing undifferentiated cells from which new cells and organs are developed

C

canopy :

the cluster of leaves borne at the tip of the stem

chlorosis :

a loss of chlorophyll resulting in white, yellow, or orange leaf color

chlorotic :

see chlorosis

costapalmate :

a leaf that is partially palmate and partially pinnate

crown :

see canopy

crownshaft :

a conspicuous cylinder formed by tubular leaf sheaths at the top of the stem

D

distal :

farthest from the point of attachment

E

epinasty :

increased growth of the upper surface of a plant part, such as a leaf, resulting in a downward bending of the part

L

lamina :

the expanded portion of the leaf (blade)

leaf base :

the basal portion of a leaf petiole that is attached to the stem

leaf blade :

the broad, flattened distal portion of a leaf

leaf segment :

divisions of palmate and costapalmate leaves

leaflet :

divisions of pinnate leaves

M

meristem :

the growing region of a plant, a special area of undifferentiated cells wherein new cells and organs are developed

midrib :

see rachis

N

necrosis :

dead tissue, usually desiccated and brown to gray in color

necrotic :

see necrosis

P

palmate :

hand-like

parenchyma :

the fundamental, unspecialized tissue of plants, composed of thin-walled cells able to divide

petiole :

leaf stem

pinnate :

feather-like

R

rachis :

the axis of a leaf beyond the petiole or an extension of the petiole into the leaf blade

S

spear leaf :

the younges emerging leaf that has not yet opened