HORT202
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

 
ROOTS
Root Classification Based on Origin
primary roots that developed as a continuation of the radicle of the embryo (seedling roots.)
Purselane
primary-root-purselane
secondary roots arising 
from a pre-existing root, also called  a lateral or branched root.
Purselane
secondary-root-purselane
adventitious roots arising from other than their normal place of origin.
Peperomia
adventitious-roots-peperomia

Root Classification Based on Function

taproot a primary root that persists and remains the dominant root. 
Weed
taproot-weed
fibrous all roots of approximately equal length and thickness. 
Grass
fibrous root--grass
storage

 a) taproot
 
 

 

a root modified for storage.

a primary root that develops thickened storage tissue (usually the cortex).

 

Beet
storage taproot-beet
storage

b) tuberous 
(fleshy)

a secondary or lateral root that developes thickened storage tissue (usually the cortex)
Sweet Potatostorage tuberous root-sweet potato

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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.