428 THE FERTILISATION OF FLOWERS, [PART III, 
young flower, and receives pollen from it in the old. Delpino 
considers that the brown colour of the broad superior stamens is a 
device to guide insects that have alighted on the flower towards the 
pollen. His view that the flower is fertilised by Sphingide and 
Bombylidee is opposed to this, for these insects seek honey only. 
Species of Anthophora, which Delpino thinks may possibly be also 
fertilisers, are likewise scarcely fitted to reach the pollen of 
Browallia (178, 360). 
My brother Fritz Miiller tells me, in a letter dated November 
10, 1869, that he finds in the allied genus Franziscea (Brunfelsia) 
Fig, 145. 
Syste? of ape pete from oe Half of the corolla and two stamens have been removed. 
a, anthers; st, s 
The dotted line i sMionien the the. aK which the insect’s proboscis must take to reach the honey. 
a structure similar to that described by Delpino for Browallia. A — 
handsome species of Franziscea, occurs at Itajahy. In this there 
are two lateral entrances to the tube, but between them the 
throat of the corolla is blocked, not by a valve formed by the 
stamens (valvola staminale, Delpino), but by the style which bends 
forward to apply itself to the anterior wall of the corolla. 
Schizanthus, Rz. and P.—The two stamens are inclosed by the | 
lower lip, and spring up when an insect settles on the latter: the 
stigma is at first shorter than the stamens, but after they have 
burst free it lengthens and projects beyond them, so as to be now 
the first part touched by an insect-visitor (346). 
Se a ee ee a ee 
