46 ORGANOGRAPHY. BOOK I. 



Villosity (adj. villosus), when they are very long, very soft, 

 erect, and straight, as in Epilobium hirsutum. Crini (adj. 

 crinitus) are this variety in excess. 



Velvet {velumen, adj. vdiitinus), when they are short, very 

 dense and soft, but rather rigid, and forming a surface hke 

 velvet, as in many Lasiandras. 



Tomentum (adj. tomentosiis), when they are entangled, and 

 close pressed to the stem, as in Geranium rotundifolium. 



Cili(S (adj. ciliatus), when long, and forming a fringe to a 

 margin, like an eyelash, as in Sempervivum tectorum. 



Bi'istles [setcB, adj. sctosus), when short and stiff, as on the 

 stems of Echium. 



Stings {stimulu adj. stimidans; pili suhulati of De Candolle), 

 when stiff and pungent, giving out an acrid juice if touched, 

 as in the Nettle. 



Glandular hairs {pill capitati), when they are tipped with 

 a glandular exudation, as in Primula sinensis. These must 

 not be confounded with stalked glands. 



Hooks {haini, unci, rostella), when curved back at the point, 

 as in the nuts of Myosotis Lappula. 



Barbs {glochis, 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 : — 



Silkg {sericeus), when they are long, very fine, and pressed 

 closely to the sm-face, 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. 



Mandate, when interwoven into a mass that can be easily 

 separated from the surface : ex. Cacalia canescens, Bupleurum 

 giganteum. 



Bearded {harbatus), 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 



