HORT 202
GENERAL HORTICULTURE LABORATORY
Lab 2: Recognition of Plant Structures
INTRODUCTION

ROOTS

 LEAF MORPHOLOGY LEAF TYPES  MODIFIED
LEAVES
 

STEM MORPHOLOGY 
 

MODIFIED STEMS
 

TYPICAL FLOWERS
 

FRUIT PARTS

     
CLASSIFICATION OF FRUIT
 
MODIFIED LEAVES
scale like leaf shaped like a small scale or awn. (Juniper, Cedar)
Juniper
scale-leaf-juniper
needle long, slender, tubular or triangular leaf. (Pine, Fir)
Pine
needle-pine
bract a modified (often reduced) leaf holding a flower or flower cluster, usually colored. (Poinsettia, Bougainvilla, Dogwood) 
Poinsettia
bract-poinsettia
cataphyll a reduced leaf usually modified for protection, such as bud scales or rhizome scales.  Function is to protect the bud.
(Pear)
Pear
cataphyll-pear
storage leaf modiifed for food storage.
(Onion, Tulip, Lily)
Onion
storage-onion
succulent thick, fleshy leaf, usually modified for water storage.
(Crassula, Portulaca, Aloe Vera,  Sedum)
Sedum
succulent-sedum
tendril slender, twining modified leaf (or stem) used for clinging to objects for support.
(Grape, Cucumber, Passionflower, Grape Ivy)
Grape Ivy
tendril Grape Ivy
spine a leaf or leaf part modified into a sharp point.
(Cactus, Locust, Holly)
Cactus
spine-cactus
trichome
or hair
hair-like outgrowths of epidermal cells of leaves.
(Geranium, Tomato, Begonia, Chyranthemum, Peach Fuzz)
Begonia
hair-begonia

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The General Horticulture Laboratory 2 Homepage, was created by Trisha Blessington Haley and was updated by Michelle Meche.  Any comments or suggestions should be e-mailed to D.W. Reed at e-mail: dwreed@tamu.edu.  If you use any of the instructional material, please give credit to the source. Copyright  D.W. Reed, TAMU.