xxvi GENERA. 



750. POTAMOGETOW. Cal. 0. Pet. 4. Style 0. Seeds 4, sessile. Herbs floating 

 or immersed, except the spiked inflorescence. The seeds rifemmder water. Potame^e. p. 346. 



751. B.TJPPIA. Cal. 0. Pet. 0. Seed 4, stalked. The M. are in fairs, included in the 

 sheathing base of the L. The Seeds are fertilised within the sheaths, and afterwards are raised 

 above woAer to he ripened. Potame^. p. 348. 



Mcenehia erecta, Moehringia muscosa and sedifolia, Cerastium tetrandrum and atrovirens. 



V. PENTANDEIA. 

 I. MONOGYNIA. 



A. Fl. inferior, of 1 petal, bearing the stamens. Seeds 4. 

 i. Germens 2, each of 2 cells and 2 seeds. 



ii. Germens at first united, afterwards separating into four. 

 Hi. Germens 4, always distinct. 



a. Seeds attached to the style. 



b. Seeds attached to a receptacle, not excavated at base. 



c. Seeds excavated at base. 



B. Fl. inferior, of 1 petal, bearing the stamens. Fr. a capsule or berry. Seeds more than 4. 

 i. Seeds on a central receptacle, in a single cell. 



a^ Fr. a dry capsule. 



b. Fr. pulpy. 

 ii. Caps, of 1 cell. Seeds on 2 parietal receptacles. 

 iii. Caps, of 1 cell. Seeds on margin of valves. 

 iv. Fr. a capsule of 2-4 cells. 

 V. Fr. a berry with 2 cells. 

 vi. Fr. of 2 follicles. 



C. Fl. of 1 petal, inferior. Pet. 1. Sta. on a receptacle. 



D. Fl. of 1 petal, superior. 

 i. Caps, of 1 cell. 



ii. Caps, of 2-5 cells. 



iii. Fr. a berry of 2-3 cells. 



E. Fl. of 4-5 petals, inferior. 



i. Fl. regular. Pet. equal. Sta. on a disc forming the base of the calyx. 



ii. FT., regular. Pet. free at base. Sta. on receptacle. 



iii. Fl. iiTegular ; lower Pet. spui-red. 

 P. Fl. of 5 petals, superior. 

 G. Fl. with a single perianth. 



A. Fl. inferior, of one stamen-bearing petal. Germens 4 (except in Cerinthe, which has only 2, 

 and in Reliotropium', where they are at first united). Flowers circinate in the hud. Seeds 

 4. L. alternate. Borragineji;. AsPERiFOLiiE of Linn. 



i. Germens 2, each with 2 cells and 2 seeds. 



561. CEE.INTHB. Cor. ventricose ; mouth naked. The L. are usually sprinkled with 

 pale, callous dots. p. 251. 



ii. Germen 1, afterwards splitting into 4 seeds. 



562. HELIOTROPIUM. Cor. salver-shaped. Mouth with 5, small, intermediate tepth. 

 Fl. in secund spikes, p. 252. 



