282 Ewart . — On the Stamina l Hairs of Thesinm . 
the anthers, becomes shorter, only reaching to their 
lower part. 
{3) The apex of the perianth-segments, at first curved 
inwards and the lateral margins either prolonged into 
flaps or inflexed, becomes gradually thickened to 
form ‘ hoods ’ over the anthers. 
(4) The stamens are gradually inserted lower down in 
the perianth. 
(5) The epidermis lining the upper part of the perianth, 
at first either thickened or consisting of elongated 
cells becomes prolonged into small projections of 
rounded cells, as in T. paniculatum (Fig. 8). The 
cells are elongated in T. selagineum and arranged end 
to end in single file. In T. debile the arrangement 
is the same, but the filaments are longer. In T. 
glaucum the filaments are irregularly two cells thick. 
T. f unale (Fig. 12) forms the starting point of the second 
part of the series. Passing from this up to T. spicatum the 
following gradations are seen : 
(1) The staminal hairs become much shorter and thicker, 
pass downwards towards the base of the style, and be- 
come arranged in two groups one on either side of the 
stamen, instead of behind it, as in T. fnnale (which 
must be regarded as an intermediate form, since 
some of its perianth-hairs are directed upwards). 
(2) The style is very short, and does not reach to the 
base of the anthers (except in T. capituliflorum). 
(3) The apex of the perianth is thickened to form a 
‘ hood/ 
(4) Stamens become inserted at the base of the perianth. 
(5) The pendent filaments are very long and thick, 
almost reaching to the stigma, and being of the 
same kind as described in T. capituliflorum . 
The inflorescence in the first part of the series is loose and 
spreading, but it becomes more compressed, and in the second 
part consists of densely packed heads of flowers. 
Function of the staminal hairs. — The correlations of the 
