Characteristic features are: the numerous
stiff adpressed unicellular clothing hairs of
leaf and stem, up to 800µ in length, thick
walled, warty, tapering from a bulbous base
to an acute apex, more numerous on the
upper leaf surface and along leaf margin
(1+4); the irregularly-shaped cells of the
epidermis, with anomocytic stomata and
bearing numerous cicatrices (2+3). Calcium
oxalate absent.