Download - Winter Twig Identification Class
Winter TwigIdentification Class
Goals of class:
1. Gain necessary vocabulary2. Learn some “reference species”3. Improve growing season skills4. Change attitudes concerninglength of field season
Node
Internode
Features of the node
leaf scar
leaf scarbundlescar
leafscarbundle
scars
leaf scar encircles bud
stipules
stipulescars
leafscar
stipulevestiges
winterbuds
lateralwinterbuds
terminalwinterbuds
no terminal bud
terminalwinterbud
DETERMINATE TWIG
terminalbud stopsgrowth
leaf scars
DETERMINATE TWIG
winter twig
pseudoterminalwinterbud
leafscar
twigscar
INDETERMINATE TWIG
directionof growth
apicaltwiggrowth
leaf scars
twig scar
leaf scars
INDETERMINATE TWIG
winter twig
stalkedwinter bud
sessilewinter bud
buds scales
imbricate buds scales
valvate buds scales
single buds scale
naked bud
superposedbud
collateralbuds
Features of the internode
pith
solid pith
chambered pith
diaphragmmed pith
triangular pith
stellate pith
Lenticels
pubescent twig
glaucoustwig
(pruinose)
scaly twig
stipitate-glandulartwig
Armature
armature(prickles)
armature(spines)
armature(thorns)
Phyllotaxis
Phyllotaxis is a description of how nodes are arranged on a stem and is expressed as a fraction.
1/3The numerator represents the number of revolutions around the stem to return to a node of similar position.
The denominator represents the number of nodes that must be counted to return to a node of similar position.
Miscellaneous
short shoots
deciduousleaves
marcescentleaves
evergreen leaves
preformed staminateaments
preformed staminateaments
fruits
fallenfruits
bark
fallen leaves