XVlll KEY TO THE ORDERS. 



OxAi.iDACE^.— Stamens 10, 5 of them longer. Styles 5, 

 distinct. Leaflets .3, obcordate, drooping at night- • 

 fall ■ 42 



* * Slamens just an many as the lohex of the corolla, owe in front 

 of each lohe. 



PrimulaoEjE. — Stamens on the corolla. Style 1. Ovary 

 1-oelled, with a free central placenta rising from 

 the base ^ H5 



Plumeaginaoe^. — Styles 5. Ovary 1-celled and 1-seeded. 144 



"« * * Stamens jurit as many as the lohes of the corolla, inserted on 

 lis tube alternately with its lobes. 



•i- Ovaries S, separate.^^ 

 Apocynace^. — Plants with milky juice. Aritjiers converg- 

 ing round the stigmas, but not adherent to them. 



Filaments distinct 179 



AsclepiadacEjE. — Plants with milky juice. Anthers ad- 

 hering to the stigmas. Filaments monadelphous. 

 Flowers in umbels 179 



+- •)- Ovary 4-lobed around the base of the style. 

 Mentha, in 



Laeiat^':. — Stamens 4. Leaves opposite, aromatic. . . .. 160 

 BoRKAGTNACEJS. — Stamens 5. Leaves alternate 167 



-1- -i- -f- Ovary 1-celled ; the seeds on the walls. 



Hydkophyllace^. — Stamens 5, usually exserted. Style 



2-cleft. Leaves lobed and sometimes cut-toothed. 171 



CtENTIANAOE^. — Leaves entire and opposite ; or (in Men- 



yanthes) of 3 leaflets ' " 176 



-!- -1- -1- H- Ovary with S or more cells, 



Aquipoliace^. — Shrubs. Corolla almost polypetalous. 



Calyx minute. Fruit a red berry-like drupe. 



Parts of the flower chiefly in fours or sixes 145 



Plantaoinacb^. — Stamens 4. Pod 2-celled. Flowers in 



a close spike 148 



Verbaseum, in 



ScEOPHULARiACE.E. — Corolla nearly regular. Flowers in a 

 long terminal spike. Stamens 5 ; the filaments, 

 or some of them, woolly 151 



PoLEMONiACE^.— Style 3-oIeft. Corolla salver-shaped, • 

 with a long tube. Pod 3-celled, few-seeded ; 

 seeds small . . » 172 



