ANALOGY OF PLANT OKGANS. 63 



C(i»ip(t»i(la perxicctfolia has pnuluced a tvhite calyx. A onrious 

 instaiu'c is nn'onli'd by ^MoiTiii {I.e.) of a Calceolaria bearing;- two 

 coherent blossoms ; the calyx ol' one was normal, but two of the 

 four sepals of the other were converted into slipper-like petals of 

 the corolla. 



In orchids the partial development of a lahellum on one or more 

 of the members of the outer (sepaline) Avhorl is not unfrequent. 

 Mr. J. T. !Moggrldg;e has described such a case in Serapim.^' 



Eranihis has been found developing the sepals into tubular 

 processes resembling the nectariferous petals within. 



St nninoid .sepah are of very rare occurrence. It is recorded that 

 they have occurred in Philadelphus ftpeciosus alone. f 



PistiUoid sepals. These have been observed in the double flowers 

 of a garden pea, in which there was a five to six-leaved calyx, 

 some of the segments of which were of a carpellary nature, and 

 bore imperfect ovules on their margins, the extremities being 

 drawn out into styles.;!: 



Prof/ffis.sire changes in the Perianth. — Staminoid perianths, as in 

 the corona of Narcissus poeticus and other species, are not of un- 

 common occurrence. 



Pixtitloid perianth. — This is not unfrequent in tulips, the 

 change being generally associated with partial virescence.§ 



Duchartre, in a note upon two monstrosities of the Crocus,\\ de- 

 scribes transformations of segments of the perianth into male and 

 female structures. 



Progressive Changes in the Corolla. — Staminoid petah. It is a 

 normal occuiTence for petals to develope anthers with pollen, in 

 Atragene and in the NgmphceacecB, where a perfect gradation may 

 he traced from a normal petal to a true stamen, the gradual de- 

 velopment of the anther being correlated with the gradual reduction 

 of the petaloid filaments. 



Several instances of petals assuming more or less of staminoid 

 functions have been recorded. In a haricot the wings and keel- 

 petals were converted into stamens.^ Corollas of Digitalis and 

 Campanula have borne anthers. In Sixifraga gramilata, in the 

 potato, and in the shepherd's purse, the petals have been replaced by 

 stamens. Cramer describes how a stamen replaced a petal in the 

 carrot.** Lastly, the spurs of the corolla of an Aquilegia have 

 borne pollen. 



PistiUoid petals are of rare occurrence ; still such have occurred in 

 a Begonia belonging to Mr. Veitch, where the apex of the petal 

 was green and stigmatiform, the basal part broad, coloured, and 

 0%-uliferous. 



* ' Joum. Lin. Soc' Botany, vol. xi, p. 490, pi. 3. 



t 'Bull. Soc. Bot. Fr.' 1858, p. 330. 



+ 'Gardeners' Chronicle,' 186G, p. 897; and 'Teratology,' p. 302. 



§ ' Teratology,' p. 302. 



II ' Bull. Soc. Bot. Fr.' 1878, p. 233. 



H De Candolle, ' Mem. Leg.,' p. 44. 



** ' Bildungsabweichungen Pflauz. Fam.,' tab. 8, f. 12. 



