MR. R. A. ROLFE ON THE APOSTASTER. 219 
section Adactylus the whole outer series is altogether suppressed 
(figs. 18 and 21). The free portions of the filaments about equal 
the column in Apostasia (figs. 18, 21, 23, and 28) and in Neu- 
wiedia Griffitii (8g. 7) ; but in other species of the latter genus 
they somewhat exceed it, sometimes reaching double this length 
(see fig. 11). 
The anthers are linear or oblong in Neuwiedia (figs. 7 and 11), 
ovate or linear-oblong in Apostasia (figs. 19, 21, 24, &c.); in 
both genera the base being more or less distinctly cordate. 
In Newwiedia the insertion of the filament is distinctly versatile 
(see fig. 11), also in the Mesodactylus section of Apostasia (sce 
fig. 24), though, from the erect position of the anther, it is not so 
perceptible unless carefully examined. In the section Adactylus, 
however, the stamens appear to be truly basifixed (see figs. 19 
and 21). In this section, too, the two cells are quite equal at the 
base, and narrowing upwards to an acute point; while in Meso- 
dactylus (see fig. 24) one cell is distinctly longer than the other, 
making the anther unequal at the base. In this section the 
anthers are not so perceptibly narrowed above and the apex less 
acute. These differences are evidently correlated with the 
presence or absence of the staminode, and make the division of 
the genus into two sections a most marked and absolute character. 
In A. stylidioides, where the character was supposed to break 
down, I have shown, under that species, that this is not the case, 
the supposition arising from an error of observation (see fig. 28). 
The anther-cells are quite parallel in Neuwiedia (see fig. 11), 
and nearly so in Apostasia (see figs. 19, 21, and 24), the difference 
alone arising from the shape of the anther in the latter genus, 
and more especially in the section Adactylus (figs. 19 and 21). 
The dehiscence is introrse by a pair of longitudinal grooves (see 
figs. 11, 19, and 24). In the section Adactylus, more especially 
in A. Lobbii, the anthers are strongly connate by their margins 
round the style (fig. 17); but I am not sure whether they 
remain so after the flowers open. Expanded flowers are wanting 
to settle this point. 
Staminode.—The staminode is only present in Apostasia, section 
Mesodactylus. It is continuous with the back of the column, and 
adnate to the style except at the extreme apex. In A. Wallichii 
(fig. 23) it is distinetly broader below, the lateral angles acute, 
narrowing upwards to an acute point, the minute apex alone 
being free. Here it is shorter than the style. In A. stylidioides 
