IN SEVERAL SPECIES OF THE GENUS LINUM. 79 
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. grandiflorum, the parallel anthers 
and stigmas, slightly diverging fróm 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 proboseides 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 pollen 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 forms 
will indifferently receive the pollen of both forms; but we know 
that the pollen alone of the opposite form will produce any effect 
and cause fertilization. 
Long-styled form of L. perenne, var. Austriacum, with the petals and calyx 
removed on the near side. 
In the case of Z. perenne, affairs are arranged a little more per 
fectly ; for the stamens in the two forms stand at different heights, 
