::-•:? : i • v:> y -•" _- :< 



through the pith. Only a few of our weeds belonging to the 

 sedge, lily and rush families h js of this kind. In the other 



class call t 9 or outside growers, the stem is composed of 



distinct layers which surround one another in circles* and are 

 usually known as bark, wood and pith. All our weeds except those 

 of the four families above mentioned belong to this class. 



T'>- !::••-: y. : =:r -•"-"•.::-'■.->- .>.■:.:..: ■:-.•:.- :>-:::^\y_> - 

 Is. If. like the corn cockle, it stands upright 

 it is said to b . if arising obliquely from a prostrate base it 



is called astettdiag. Stems which grow along the ground without 

 rooting are prostrate ( purslane) or trailing (ground ivy)'. The 

 stems of some - is the plantain and dandelion, are very short, 



th- " •- v- ~ ::--■•''- ^yyy ::-;:: v. ; : -- :: y .'yyyy;: ?i 



•-.•' ■:■ <■- ■.'.'. : :*••.-:-'.--;•.' s >v. ~ r->-.y'.k > -V.- : . y * ,;;.■•• 



:mial weeds produce both ordinary erect and creep- 



_ _ und stems, tine latter being called r b or 



rhizomes. Th be known from true roots by their bearing 



buds at short intervals. When the conditions are favorable these 



. : s ...... ;.. .,. - ; ; '.'vy;y;y:-.;; >- s <•.; '._ y v y- v -yy_y - 



most difficult of all weeds to eradicate. The stems of a 



y.quefoil. produce above ground and near the base rw: 

 or offsets which *ake root and form new plants. 



The ] - ced& — Le - among the most important 



is ss: • "" • ■. _■ ■ - ,• ' 



It is 1 also which has the sole power of absorbing 



carbonic g - from the air and by the aid of the sun's heat 



and light, in the presence of the green coloring m&~ uoro- 



spng it into starch, this being used in forming other 



tissues s - seeds or tubers* In th ase tiss 



sun's ' and ligh- > si red and when th I SB - 

 burn - - animals the ene rg - - - free and can be 



controlled by man. Hfost he energy used by man and animals 

 in performing the work of the world was at one time thus gathered 

 by leaves and stored in the roots i sterna or fruits of plants. 



gams of respiration or breathing which 



'- bl „• 'hem also that t't ss >f water 



wes of - g - :hey thus do the 



g --■•n. breathing and transpiration - g„ it is 



;>lain that if one can prevent a weed from producing lea - 



Th irt of a leaf is called the Mmi* and the 



