488 Hill . — The Floral Morphology of the Genus Sebaea. 
homo-styled flowers are to be found, whereas in other species the flowers 
may be either dimorphic or of only one type. 
Summary. 
The genus Sebaea , which contains about 100 species, is diplostigmatic, 
that is to say, in addition to the apical stigma, secondary stigmatic 
patches are borne on the style below the level of the anthers in nearly all 
the species examined. 
The secondary stigmas, which are placed at right angles to the lobes 
of the apical stigma, appear to represent the lower part of the edges of these 
lobes, which have become separated from the apical stigma by the inter- 
calation of a non-papillated portion of stylar tissue. 
The flowers of Sebaea are protandrous and the anthers open in the 
bud ; the pollen is thus shed on the secondary stigmas which are situated 
about the level of the throat of the corolla. Self-fertilization can thus be 
effected without difficulty, though cross-fertilization is not precluded. 
As a result of the artificial pollination of these secondary stigmas, after 
removal of the apical stigma in the bud, seeds were formed from which 
plants have been raised. Fewer and poorer seeds were formed as a result 
of pollinating the terminal stigma alone. 
It is suggested that the peculiar condition of these flowers may be 
compared to an abbreviated type of heterostylism modified to ensure self- 
rather than cross-pollination. Cases of peculiar types of stigmatic arrange- 
ment in other genera of this Family are mentioned, and in particular the 
normally heterostyled genus Exochaenium. It seems not unlikely that 
heterostylism may be proved to exist in at least one species of Sebaea. 
EXPLANATION OF PLATE XXXV. 
Illustrating Mr. A. W. Hill’s paper on the genus Sebaea. 
The figures, with the exception of Figs. 3-8 and 16-17 have been drawn by Miss M. Smith. 
The names and numbers in brackets refer to the specimens preserved in the herbarium of the Royal 
Botanic Gardens, Kew, from which the drawings were made. 
Fig. 1. Pleurogyne carinthiaca , G. Don (Ellis, 357), showing one of the stigmatic bands. There 
is no stigma proper, x 3. 
Fig. 2. The same (Aitchison, 33), showing the two stigmatic bands on the ovary walls, x 6. 
Fig. 3. Sebaea ovata , R.Br. The terminal stigma is bilabiate, and there are two decurrent 
bands of stigmatic papillae continued down the style from the edges of the terminal stigma. 
