182 



MONOPETALOUS COROLLAS. 



shaped, when the tube is very short, and the limb flat and spreading, 

 as in Myosotis (fig. 297); when the divisions of the rotate corolla are 

 very acute, as in Galium, it is sometimes called stellate or star-like ; 

 urceolate or urn-shaped, when there is scarcely any limb, and the tube 

 is narrow at both ends, and expanded in the middle, as in Erica 

 cinerea (fig. 298). Some of these forms may become irregular in 

 consequence of certain parts being more developed than others. Thus, 

 in Veronica, the rotate corolla has one division much smaller than the 

 rest, and in Digitalis there is a slightly irregular campanulate corolla 

 (fig. 288), which some have called digitaliform. 



381. Irregular Nonopctalous or Gamopetalous Corollas. Among 



these may be remarked the labiate or lipped (fig. 299), having two 

 divisions of the limb in the form of what are called labia or lips 

 (from a fancied resemblance to a mouth), the upper one composed 

 usually of two pieces, and the lower of three, separated by a hiatus or 

 gap, I. In such cases the tube varies in length, and the parts of the 

 calyx follow the reverse order in their union, two sepals being united 

 in the lower lip, and three in the upper. When the upper lip of a 

 labiate corolla is much arched, and the lips separated by a distinct 

 gap, it is called ringent (ringor, to grin). The Labiate corolla charac- 

 terizes the natural order Labiatse. In Lobelia, there is a Labiate corolla, 

 the upper lip of which becomes convex superiorly, and is split to near 

 the base. When the lower lip is pressed against the upper, so as to 

 leave only a chink or rictus between them, the corolla is said to be 

 personate or masked (persona, a mask), as in Frogsmouth, Snapdragon, 

 and some other Scrophulariaceae (fig. 300), and the projecting portion, 



Fig. 297. Regular gamopetalous rotate corolla of Myosotis palustris, or Forget-me-not c, 

 Calyx, p. Corolla, r. Folds of the corolla, forming projections at the upper part of the tube, 

 which are opposite to the lobes of the corolla. 



Fig. 298. Regular gamopetalous urceolate or urn-shaped corolla of Erica cinerea, or cross- 

 leaved Heath. Letters as in fig. 295. 



Fig. 299. Irregular gamopetalous labiate or lipped corolla of Salvia pratensis. c, Calyx. <, 

 Tube of corolla. /, Limb, forming two lips, having a gap or hiatus between them, s, Summit of 

 style. 



Fig. 300. Irregular gamopetalous personate or masked corolla of Antirrhinum majus, or 

 Frogsmouth. c, Calyx, t, Tube of corolla, having a gibbosity or swelling, a, at its base. /, Limb 

 of corolla, g, The faux or mouth closed by a projection of the lower lip, p. 



