86 Flowers and their Unbidden Guests, 



project in horizontal and parallel lines ; so that small 

 weels are formed, and fill up the interspaces between 

 each stave and its neighbour. This is more especially 

 the case when the anthers also contribute to the closure 

 of the nectary ; conniving and coming into lateral con- 

 tact with each other, so as to form a conical hollow 

 space within the flower, the apex of which points out- 

 wards, while the base is upon the filaments ; as may be 

 seen for example in Vaccinrnm oxycoccos (Plate III. 

 fig. 103, longitudinal section of flower ; fig. 104, trans- 

 verse section of the circle of stiff filaments, laterally 

 beset with trichomes). A like arrangement may be 

 also noticed not unfrequently in the androecium of the 

 Compositse and Campanulacese. I have tried to illus- 

 trate this in Plate III. fig. Ill, by a longitudinal 

 section of a flower of Cirsium spinosissimum ; and in 

 Plate III. fig. 89, by a drawing of a single anther with 

 a much dilated and hollowed base from a flower of 

 Campanula barbata. 



Lastly, the gynsecium may be the seat of the weel- 

 formation. A beautiful example of this is furnished 

 by Monotropa hypopitys L. In this flower there is a 

 coronet of trichomes on the style, just below the pro- 

 tuberance which surrounds the stigma. These trichomes 

 radiate from the style, and touch the petals with their 

 free ends, so as to form a circular diaphragm. (Plate I. 

 fig. 19, longitudinal section of anterior part of flower j 

 fig. 18, end of style seen from above.) 



