$2 PRINCIPLES OF BOTANY, ETC. 
tube of the corolla is perfectly cylindrical but very 
long, and the rim forms a broad expansion, Bes ‘2675 
as in Phlox. 
9, Wheel-shaped, (rotate), when a alindeak 
tube is very short, nearly shorter than the calyx, 
sometimes hardly perceptible, and its margin is 
quite flat. It 1s almost the same with the foregoing, 
only the tube is very short, as in shepherd’s club, 
Verbascum. 
10, ‘Tongue-shaped, es when the tube is: 
not long, suddenly ceases, and ends in an oblong 
expansion, as in the Aristolochia Clematitis, fig. 271, 
and in some flowers that are contained in a common 
perianthium, fig. 84. 
11. Difform, (difformis), when the tube gradually 
becomes wider above, and is divided into unequal 
lobes, as im some corollas that are included ina 
common perianthium, ¢. g. the bluebottle, Centaurea 
Cyanus. 
12. Ringent, (ringens),' when the margin of a 
tubular corolla is divided into two parts, of which 
the upper part is arched, the under oblong, and has 
some resemblance to the open mouth of an animal, 
as in sage, Salvia officinalis, figs 72. 
13. Masked, ( personata), when both segments of 
the ringent flower are closely pressed together, as in 
snapdragon, Antirrhinum majus, fig. 49. 
14. Bilabiate, (dilabiata), when the corolla has 
two segments or lips which lie over against each 
other, and which are themselves often laciniated or 
cleft, fig. 272. * 
15. One-lipped, (unilabiata), when in a ringent, 
pcks 
