245 
Glands of the Plumb agineae . 
three species. At all events one ought to expect them to be 
present in V. indica , when a variety of it possesses them. 
Professor Bayley Balfour calls attention to the occurrence of 
glands on the inner face of the calyx of V. pendula \ They are 
scattered over the median area of the sepals (Fig. 29, gl), and 
are either sessile or elevated on small pedicels. The base of 
the glands is usually four-celled (Fig. 30, b) ; often it is two- 
celled. The secretory cells are numerous, and very thin- 
walled. They closely resemble the sessile glands on the 
sepals of Plumbago coccinea and P. capensis , to be afterwards 
described. 
Ceratostigma. 
Small but very numerous multicellular mucilage-glands 
occur in the axils of the leaves of Ceratostigma abyssinica. 
Similar organs were not positively determined in C. Grijftthsii ; 
but better material would probably disclose them. C. plum - 
baginoides seems to be without them. Mettenian glands alone 
occur on both faces of the calyx, along with sclerosed den- 
dritic hairs common in the genus. 
Acantholimon. 
The leaves of this genus are ordinarily aciculate, the bases 
being membranous, amplexicaul, and closely pressed to the 
stem some distance above the line of origin. In very few 
cases only do glands appear on the petiolar sheath, worthy of 
the term mucilage-gland as applied hitherto. One portrayed 
(Fig. 31) from the axil of Acantholimon cabulicum , although 
only -17 mm. in diameter, must be regarded as such. In A. 
venustum a few multicellular glands projecting prominently 
above the surface of the epidermis were found. One measur- 
ing *29 mm. and another *2 6 mm. in diameter, could not be 
otherwise designated than mucilage-glands proper. Similar 
glands were seen in A. tenuifolium , A. Pinardi , and A. 
Calverti. In A. calocephalum , A. armenium , A. tibeticum 
1 Balfour, Botany of Socotra, Trans. Roy. Soc. Edinburgh, vol. xxxi, 1888, 
p. 151. 
