DIFFERENT STRUCTURES OF COROLLA. 21 



VARIATIONS OF A SPATHA, 



A spatha is either monophyllous, as in Narcissus ;.^diphjUous, 

 as in Stratiotes ;.,.or imbricate, as in Musa. 



CHAP. XII. 



OF THE DIFFERENT STRUCTURES OF THE COROLLA. 



THE variations of the corolla, in respect to Numb-er, concern 

 either petals, or lacinice, segments : the variations of the nectarium 

 shall be given separate. 



The corolla, in respect to its petals, is either monopetalous, or 

 consisting of one petal, as in Convolvulus and Primula ;...dipe- 

 talous, of two, as in Circle a and Commelina;.. Jripetalous, of 

 three, as in Alisma and Sagittaria;... tetrapetalous, of four, as 

 in the class Tetr -adynamia* ;...pentapetalous, of Jive, as in umbel- 

 liferous plants j-;. t .hexapetalous, of six, as inTuLiPA, Lilium, Po- 

 dophyllum ;...enneapetalous, of nine, as hiThea, Magnolia, and 

 Liriodendron ;...or polypetalous, of many, as in Nymph;ea. 



In respect to its lacinia (which concern rather the monopeta- 

 lous than the polypetalous, being but rarely observed in the lat- 

 ter) it has either two, as in Alsine and Circtea ;.*.three, as in 



* See Part II. Chap. XVIII. 



f The umbelliferous plants are in the order Digynia of the class Pentandria , 

 m Part II. Cbap.VIIL 



