SPEEMAPH YTES. 



149 



The flowers open for several days in succession, but only 

 when the sun is shining. They are visited by numerous 

 insects which carry the pollen from one flower to another and 

 deposit it upon the stigma, where it germinates, and the tube, 

 growing down through the long style, finally reaches the 

 ovules and fertilizes them. Usually only a comparatively 



FIG. 82. Erythronium. A, a portion of the wall of the anther, x 150. B, a 

 single epidermal cell from the petal, x 150. C, cross-section of a fibro- 

 vascular bundle of the stem, x 150. tr. vessels. I), E, longitudinal section 

 of the same, showing the markings of the vessels, x 150. F, a bit of the 

 epidermis from the lower surface of a leaf , showing the breathing pores, x 50. 

 G, a single breathing pore, x 200. H, cross-section of a leaf, x 50. st. a 

 breathing pore, m, the mesophyll. /&. a vein. /, cross-section of a breath- 

 ing pore, x 200. J, young embryo, x 150. 



small number of the seeds mature, there being almost always 

 a number of imperfect ones in each pod. The pod or fruit (F) 

 is full-grown about a month after the flower opens, and finally 

 separates into three parts, and discharges the seeds. These are 

 quite large (Fig. 81, J) and covered with a yellowish brown 



