64 MR. G. BENTHAM ON AUSTRALIAN PROTEACE E. 
towards the upper segment, and if elastically curved, as in Cono- 
spermum, would be exposed to the perfect anthers. It must be 
retained in its primitive position ; and this is done by the conver- 
sion of the upper barren anther below it into a short broad strap, 
firmly fixed to the edge of the stigmatic disk and retaining it 
with its face against the upper perianth-segment. The stigma 
thus held by the eunuch is safe from all pollution from her brother 
anthers behind her back, and is preserved intact for any pollen 
that may be inserted in the opening between the disk and the 
upper segment by insects or other agencies. 
Stirlingia (which may resume Brown's name Simsia, if Per- 
soon's earlier genus of that name merges into Encelia) has the 
peculiar open-celled anthers of Conospermum and Synaphea, two 
cells of adjoining anthers being applied face to face in the bud, 
forming together one globular or ovoid cell as in those genera; 
but the flower is regular, with the anthers all perfect, forming 
four closed cells round the style under the stigma, which is cup- 
shaped and almost closed in the bud, and expands into a disk as 
the flower opens, stigmatic on the upper surface, whilst the 
anthers have opened below it, as in the straight-flowered Persoonias. 
EXPLANATION OF THE PLATES. 
Piare I. 
. Petrophila longifolia ; bud cut open, style, and anther. 
. Persoonia articulata ; bud cut open, and stamen. 
. Persoonia saccata; bud cut open. 
. Banksia marginata; bud cut open, style, and stamen. 
. Grevillea buxifolia; bud cut open, showing the appendage of the style 
closely bent back, and expanded flower with the appendage of the sty le 
spreading. 
. Grevillea Wilsoni ; flower and detached style. 
. Grevillea vestita ; bud, the same cut open, and detached style. 
. Adenanthos obovata; flower partially opened, and section of the upper 
poruon Prats II. 
Fig. 9. Adenanthos pungens; flower partially opened, section of the upper pot 
tion, and detached upper portion of the style. 
10. Agastachys odorata ; bud and the same cut open. 
igi Conospermum taxifolium ; flower, the same with the lower lip removed, 
showing the barren anthers in front of the style, and a flower cut ope? 
12. Synaphea dilatata: bud; a, the same with the lower lip remoY 
showing the perfect anthers in front of the style; 5, the same w ith the 
lower and lateral lobes removed ; c, stamens and style, lateral view, 3? 
perianth opened out. 
In the figures of both Plates s indicates the stigma. 
Fig. 
om oe bo m 
oo -10 
