246 Wilson — The Mucilage - and other 
and A. glumaceum there were found in the same situation 
oval multicellular glands only a little larger than the 
Mettenian. To these the name ‘intermediate’ may be appro- 
priately given. In the remaining species of Acantholimon 
examined even these were not met with. The genus would 
thus seem to be characterised by the almost universal absence 
of mucilage-glands strictly so-called. At best there is but a 
distant approach to the condition exemplified by Statices and 
Armerias. What are here styled intermediate glands occur 
abundantly in all genera. They will be further treated of 
below. 
Plumbago. 
Plumbago rosea possesses a few mucilage-glands in the leaf- 
axils, the largest being *38 mm. in diameter. Glands of a 
similar size are found in P. capensis. In the latter species 
the base of the leaf is very narrow, and one hardly expects 
to find mucilage-glands there. The search for them is not 
always successful, and it is possible that they are not present 
in the axils of all the leaves. Hair-like prominences also 
occur in the axils of this species. In P. zeylanica mucilage- 
glands of the same size as those in the above species occur. 
A large number were seen clustered in the axil of a young leaf, 
a somewhat small example from which is figured to illustrate 
the relative size of the basal and secretory cells (Fig. 32, b, e). 
Distinct mucilage-glands exist in the axils of the bracts as 
well as of the leaves of P. scandens . They have not been 
hitherto discovered in P. pulchella , P. europaea , or P . 
micrantha . Intermediate glands are conspicuous in P. 
europaea (Fig. 33). They exhibit the accessory cells (ac) 
which Volkens 1 found characteristic of the Mettenian glands 
in this and other Plumbagineae. P. micrantha , an annual 
species, presents the great peculiarity of bearing on the 
margins of its leaves and auricles, glands which are either 
sessile, or elevated on conical epidermal processes (Figs, 34, 
35). They are present round the entire margins, and 
1 Volkens, loc. cit. 
