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The External Form of Plants. 131 
in Viola and many orchises, or Aooded, as in the monks- 
hood |. | ! 
The form of the apopetalous, like that of the gamo- 
- petalous corolla, varies, and may be géovose, campanutate, 
rotate, &tc.; but the most important point to note in it is 
the form and the relative position and number of the petals. 
As respects their form, they may be evtire as in the apple; 
obcordate as in Aithusa cynapium ; toothed or fringed as in 
“many Caryophyllacee (Fig. 250); jambriate as in Dianthus 
Fic.°250.—Unguiculate petal Fic. 251.—-Bifid unguicu- Fic. 252. —- Cruciform 
_ of Dianthus, with toothed late petal of Lychuts, flower of Lunaria 
lamina. with ligule. ma unguiculate pe- 
tals. 
plumarius ; bifid asin Lychnis diurna (Fig. 251) ; ungueciulate 
(Figs. 250-252), when the petals are very narrow in the 
lower part, which forms a claw or wzguzs, while comparatively 
broad in the upper part or Zamzna, &c. 
There are several forms of the apopetalous corolla which 
are of especially common occurrence, and therefore worthy 
of note [and which are frequently characteristic of large 
natural groups|: v2z. the cruciform, papilionaceous, caryo- 
phyllaceous, rosaceous, and the less common but very re- 
markable mitreeform. In the cructform corolla (Fig. 252), 
- characteristic of the large natural order of Cruciferee, we find 
four unguiculate petals arranged in the form of a cross, and 
alternating with the four sepals. The papzlonaceous corolla 
(Fig. 253), confined to the division Papilionaceze of the order 
K 2 ; 
