MONCECIA. 



Flowers in spikes or clusters ; 

 calyx of the barren flower of 4 

 sepals, or 4-cleft ; seed 1. Her- 

 baceous plants with, hairy or 

 stinging leaves, and small, green 

 flowers, which are remarkable 

 for the elasticity of their stamens. 

 TRIBE, P. 559. 



15. PARIETARIA. 



16. URTICA. 



ORDER V. PENTANDEIA, 5 Stamens. 



17. ATRIPLEX. Herbaceous or somewhat shrubby 

 plants, with fleshy, often angular and mealy leaves, and 

 leafy compound spikes of greenish flowers, which, as 

 well as the foliage, are not unfrequently tinged with 

 red. GOOSE-FOOT TRIBE, ' P. 528. 



ORDER VI. POLYANDEIA. More tJuin 5 Stamens. 



18. MYRIOPHYLLUM. Sepals 4 ; petals 4 ; stamens 8 ; 

 mstils 4. Submersed aquatics, with finely-divided 

 leaves and small whorled or spiked flowers. MARE'S- 

 TAIL TRIBE. P. 215. 



19. CERATOPHYLLUM. Sepals numerous ; petals ; 

 stamens 18 20; pistil 1. Submersed 'aquatics with 

 finely divided, rigid, and whorled leaves. HORNWORT 

 TRIBE. P. 218. 



20. SAGITTARIA. Sepals 3 ; petals 3. An herba- 

 ceous aquatic, remarkable for its large arrow-shaped 

 leaves, and delicate lilac flowers. WATER-PLANTAIN 

 TRIBE. P. 631. 



21. POT^RIUM. Flowers in a round head, the upper 

 fertile, the lower barren. A slender herbaceous plant, 

 with pinnate leaves, and round heads of greenish 

 flowers, which are remarkable for their tufted pistils 

 and long stamens. EOSE TRIBE. P. 171. 



22. ARUM. Stamens and pistils arranged in sepa- 

 rate rings round a common central column or spadix. 



