60 
ORGANOGRAPHY. 
BOOK I. 
Bristles (setcB, adj. setosus), when short and stiff, as on the 
stems of Echinm. 
Stings [stimuli, adj. stimulans ; pili suhulati of De Candolle), 
wlien stiff and pungent, giving out an acrid juice if touched, 
as in the Nettle. 
Glandular hairs \pili capitati), when they are tipped with 
a glandular exudation, as in Primula sinensis. These must 
not be confounded with stalked glands. 
Hooks {liami, unci, rostella), when curved back at the point, 
as in the nuts of Myosotis Lappula. 
Barbs (glocliis, adj. glochidatus), if forked at the apex, both 
divisions of the fork being hooked, as in the nuts of the same 
plant. 
Hairs also give the following names to the surface of any 
thing : — 
Silky [sericeus), when they are long, very fine, and pressed 
closely to the surface, so as to present a sublucid silky 
appearance : ex. Protea argentea. 
Arachnoid, when very long, and loosely entangled, so as 
to resemble cobweb : ex. Calceolaria arachnoidea. 
Manicate, when interwoven into a mass that can be easily 
separated from the surface: ex. Cacalia canescens, Bupleurum 
ffio'anteum. 
o o 
Bearded [harhatus), when the hairs are long, and placed 
in tufts : ex. the lip of Chelone barbata. 
Rough [asper), when the surface is clothed with hairs, 
the lower joint of which resembles a little bulb, and the upper 
a short rigid bristle ; ex. Borago officinalis. 
Stellate, or starry, when the hairs grow in tufts from the 
surface, and diverge a little from their centre, as in the Mal- 
low tribe. 
Hairs are either formed of a single cell of cellular tissue 
(Plate I. fig. 8. b, and Plate II. fig. 18.) or of several placed 
end to end in a single series, (Plate I. fig. a, b,) whence, if 
viewed externally, they have the appearance of being divided 
internally by transverse partitions. They are sometimes 
branched into two or three forks at the extremity, as in 
Alyssum, some species of Apargia, &c. Occasionally they 
