IK SETEBAL SPECIES OF THE OEJfUS LmUM. 



70 



would have been separated from them by the ring of broad fila- 

 ments, and could never have been fertilized. As it is, the styles 

 diverge greatly and pass out between the filaments. The stigmas, 

 being short, lie within the tube of the corolla ; and their papillous 

 faces, after the divergence of the styles, being turned upwards are 

 necessarily brushed by every entering insect, and thus receive the 

 required pollen. 



In the long-styled form of L. grandijiorum, the parallel anthers 

 and stigmas, slightly diverging from the axis of the flower, project 

 only a little above the tube of the somewhat concave corolla ; and 

 they stand directly over the open space leading to the drops of 

 nectar. Consequently when insects visit the flowers of either 

 form (for the stamens in this species occupy the same position in 

 both forms), they will get their proboscides well dusted with the 

 coherent pollen. As soon as the insect inserts its proboscis to a 

 little depth into the flower of the long-styled form, it will neces- 

 sarily leave poUen on the faces and margins of the long stigmas ; 

 and as soon as the insect inserts its proboscis to a rather greater 

 depth into the short-styled flowers, it will leave pollen on their 

 upturned stigmatic surfaces. Thus the stigmas of both forma 

 wiU indifferently receive the pollen of both forms ; but we know 

 that the pollen alone of the opposite form will produce any eflect 

 and cause fertilization. 



Long-efyled form of L. perenae, var. Atislriacum, with the petals and calvi 

 removed on the near side. 



In the case of L. perenne, aifairs are arranged a little more per- 

 fectly ; for the stamens in the two forma stand at different heights, 



