3 1878. | Glandular Hairs of Plants. : ho 
The common mullein is covered in every part with a still more 
abundant supply of branching hairs. The main axis of the hairs 
has radiating arms at different heights along its length. The 
glaucous nature of cabbage leaves and plums is due to numerous 
= small cells on the surface. The mealy substance on pig weed, or 
_.. lamb’s quarter, consists. in 
numerous capitate hairs. 
Shepherdia canadensis is 
a rather rare shrub grow- 
ing about the borders of 
lakes and seas. The 
young stems and buds, 
and portions of the leaves, 
are rendered red or rusty 
on account of the large 
number of scales, each of 
which is held to the plant 
by a short stem. Figs. “Fic. 18.—Branching hair on Shepherdia 
18 and 19 show two of canadensis. ` 
Fic. t9.—Shield-shaped scale on Shepherdia canadensis. ee 
these objects. In Fig. 19 there are several rays attached side by = 
