African and Madagascar Flowering Plants. 377 
Leucadendron adseendens R. Br. (Figs. 1 20-131). 
The flowers are unisexual and dioecious. In the male 
flower, the pollen is shed upon the barren style which is 
marked by eight faint longitudinal grooves corresponding to 
the anther-loculi, and which are homologous to the deep 
ones on the style of Protea : it appears to be held upon 
the style, however, mainly by a yellow, sticky secretion in 
the epidermal cells of the latter. The female flowers have the 
stigmatic surface always inclined outwards, usually at about 
45 0 to the style. For Protea and Leucospermum , see Ann. 
of Bot. Vol. IV, No. xiv, p. 274. 
Serruria congesta, R. Br. (Fig. 122.) 
The sepals in the bud are closely united over the tip of 
the style. If they are touched when the flower is ripe, they 
spring sharply back and immediately become strongly re- 
flexed, showing that their outer surface has a stronger tension 
than the inner. A certain amount of pollen is scattered by 
this sudden separation, but most is held on the thickened 
style-extremity, which is faintly ribbed and seems also sticky. 
The stigma lies in a minute depression at the summit of the 
style, and does not ripen till after the pollen has been in large 
part removed. The anthers end in barren tips, t. Visitors : — 
Apis mellifica and other Hymenoptera. 
Pterygodium alatum, Sw. (Figs. 123-126.) 
In this species the posterior sepal and petals are connate 
into a helmet-like hood, the ‘galea’: the labellum and column 
are adnate, and form what is called the ‘ lamina,’ the shape of 
which will be clear from Fig. 123 (the view in front) and Fig. 
124, a longitudinal mesial section. It consists of an upright 
column blocking the entrance to the galea, and in the lower 
part of a broad membranous bilobed wing, which on both 
sides turns slightly sideways so as to be visible in the longi- 
tudinal section. The anther and stigmata occupy the cavity 
of the galea behind the upright part of the lamina, and a 
deep groove which is lowest in the middle (i. e. at insertion of 
lamina) separates them from it. The two lobes of the anther 
D d 2 
