THE FLORAL ENVELOPS, OR PERIANTH. 



97 



478. Urceolate, urn-sliaped ; an oblong or globular corolla with a 

 narrow opening, as tho whortleberry, heath. 



479. Funnel-form (infundibulifomi), narrow tubular below, gradu- 

 ally enlarging to the border, as morning-glory. 



480. Salver-form (hypocrateriform), the tube ending abruptly in a 

 horizontal border, as in Phlox, Petunia, both of which are slightly ir- 

 regular. 



481. Tubular, a cylindraceous form spreading little or none at the 

 border, as the calyx of the pink, corolla of the honeysuckle. It is 

 often a little curved. Tubular flowers are common in the Composite, 

 as the thistle, sunflower, when they are often associated with 



482. Ligulate (ligula, a little tongue), apparently formed by the 

 splitting of the tubular on one side. The notches at the end plainly 

 indicate the number of united petals composing it, as also do the paral- 

 lel, longitudinal seams. 



483. Labiate, bilabiate, lip-shaped, resembling the mouth of an ani- 

 mal. This very common form results from the unequal union of the 

 parts, accompanied with other irregularities. In the labiate corolla 

 three petals unite more or less to form the lower lip, and two to form 

 the upper. In the calyx, when bilabiate, this rule is reversed, accord- 



Forms of corollas. 318, Campanula Americana; rotate. 319, Campanula divaricata. 820 

 Andromeda, urceolate. 321, Convolvulus (morning-glory). 322. Petunia. 323, Lonlcera sem- 

 pervirens (honeysuckle). 824, Dandelion ; ligulate corolla (c), 5-toothed ; a, five anthers united 

 Into a tube around *, the style. 325, Synandra grandiflora, ringent, upper lip 2-lobed, lower 

 8-lobed. 326, Linaria (yeUow snapdragon), personate. 327, Cypripediuin acaule, orchidaceous. 



