INTRODUCTORY LESSONS. 



XXI 



, A Perfect Flower may consist of pistils and stamens only, and of 

 these the styles and filaments are not essential. 



Cohesion of Floral Organs. When sepals cohere or grow fast to 

 each other (Figs. 48- 

 51) the calyx is Gamo- 

 sepalous. So, also, 

 the corolla may be 

 Gamopetaloiis. When 

 stamens cohere they 

 are Monadeiphous if 

 in one set, Diadel- 

 phous if in two sets 

 (usually 9 and 1), etc. 

 Cohering pistils (car- 

 pels) form a Com- 

 pound Pistil. The de- 

 grees of cohesion in 

 calyx and corolla is 

 described, as in leaves, 

 by the terms entire, 

 cleft or lobed and 

 parted. Thus : Bind- 

 weed (Fig. 50) has an 

 entire corolla limb; Zauschneria (Fig. 51) 

 has a 4-lobed calyx; Nemophila has a 

 5-parted or deeply 5-lobed corolla, etc. 

 If the flower has a limb (border) dis- 

 tinct from the tube, these terms apply to 

 the limb. 



Adhesion of Floral Organs. The 

 calyx may grow fast to the ovary (Fig, 51), 

 then it is said to be Superior (ovary in- 

 ferior). The corolla and stamens fre- 

 quently grow on the calyx, as in Fuch- 

 sia, Strawberry, etc.; then they are said 



48. Bud of Eschselioltzia, with the mitriform calyx removed and 

 shown above. 49- Open flowei' of the same, with two of the petals 

 removed, one of these below with the stamens adhering to the claw. 

 50- Flower and 1 'af of Convolvulus arvensis; above is the corolla split 

 down, displaying five unequal stamens. 



