52 ORGANOGRAPHY AND GLOSSOLOGY. 



and limb, or forming small swellings inside the tube (Lychnis Chalcedonica) ; they 

 also sometimes occur in monopetalous corollas. Small scales, placed within and on 



243. Hellelvwns. 

 Tubular petal. 



241. Nifrella. 244 Wx. Winter Aconlto. 



Two-llppcd petal. Two-lipped petal. 





211. 242. 



Mignonette. Inner nnd lateral |>etals. 



246. ColiimHne. 



Pct;il in u hood or 



cornucopia. 



24S. Trolliua. 



Petal with one lip 



(mag.). 



247. Aconite. 



Flower nnknl, without calyx ; 

 petals liiHxktl, pcdicelled (mag.). 



the top of the claw, forming a sort of crown around the andrcccium and pistil, are 

 collectively called a corona (coronula, Lychnis dioica, figs. 239, 240 ; Mignonette, 

 figs. 241, 212). 



The limb of the petal may be entire (Wallflower, fig. 9), or toothed or fringed 

 (Mignonette, figs. 241, 242). 



Petals are generally flat (p. plana], like the leaves ; but may be concave (p. con- 

 cava, Barberry, fig. 238) ; tubular with entire margins (p. tubulosa, H elleborus fcetidus, 

 fig. 243) ; bilabiate (p. bilabiata),or tubular with the mouth two-lipped (Nigella,fig. 

 244 ; Winter Aconite, fig. 244 bis) ; labiate (p. labiata), when the tube terminates in a 

 single lip (TroUius, fig. 245); hooded (p. cucull if orrnia, Columbine, fig. 246; Aconite, 

 fig. 247) ; spurred (p. calcariformia), i.e. forming a spur or horn (Heartsease, fig. 248 ; 



248. Heartsease. 

 Flower cut vertically, showing 

 the horn of the lower petal. 



240. Larkrpar. 

 l in a spur formed of 

 four united petaU. 



250. Rocket. 

 Flower. 



251, Chelidoninm. 

 Flower. 



Larkspur, fig. 249). Hollow petals, of whatever form, usually enclose at the base a 

 gland which is nectariferous when the flower expands, and the anthers open to shed 

 their pollen. 



The regular polypetalous corolla is cruciform (c. cmriformis), when it consists of 

 four petals placed crosswise (Rocket, fig. 250 ; Chelidonium, fig. 251) ; rosaceous 



