I06 MONARDA DIDYMA. OSWEGO TEA. 



narda the divisions are minute and nearly equal. (See Fig. 3.) 

 Passing- over other minor characteristics, we will only add that 

 the anthers also offer a very good distinguishing mark. In Sal- 

 via the twin anther-cells are attached to separate divisions of the 

 filament; and while one of them is perfect and projects forward, 

 the other is imperfect and extends backward, both stamens 

 formino- lever-like appendages, which to some degree obstruct 

 the passage of insects in search of the sweets in which these 

 flowers abound. In Moiiarda, on the contrary, the anther-cells 

 are widely divergent at the base, but are joined together at the 

 apex. 



Morphologically considered, the genus Mojiarda is a welcome 

 one to the student, as it shows better than many others the inti- 

 mate relations between the different portions of a plant, from the 

 leaf to the final fruiting condition. It is very well known that 

 primarily all the parts of the flower are leaves ; or, correcdy 

 speaking, what might have been leaves under certain conditions, 

 become instead calyx, corolla, or some other parts of the flower. 

 In the change from the leafy to the floral condition, the growth 

 waves are usually uniform in each species. At flowering, these 

 growth-waves operate very strongly in a spiral direction, giving 

 great force to the development of what might have been an axil- 

 lary bud, but which now becomes a flower, and wholly sup- 

 presses the elongating portion — the main axis or stem. In a 

 sunflower, for instance, we have all the growth resulting in the 

 formation of a broad flat mass of litde florets, and this circular 

 growth is always the same in all sun-flowers. In our Mo7iarda 

 we have the same total suppression of this elongation of the 

 main stem in the heads of flowers, terminating the branchlets in 

 Fig. I ; but in Fig. 2 the axis pushed on after waiting a little to 

 permit of the lower head of flowers being formed and then 

 started on again, ending in two more waves. Thus we have a 

 branch with three small heads, resulting from three distinct 

 rhythmic growths in Fig. 2 against the single wave in Fig. i. 

 The theoretical lesson from this is, that in this species the rhyth- 



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