XVIU KEY TO THE ORDERS. 



OxALiDji OEiE. — Stamens 10, 5 of them longer. Styles 5, 

 distinct. Leaflets 3, obcordate, drooping at night, 

 fall 42 



* » Stamens jusi as many as the lohen of the corolla, one in ^ont 



of each lobe. 



Peimulaoe^. — Stamens on the corolla. Style 1. Ovary 

 1-celled, with a free central placenta rising from 

 the base 145 



Plumbaginace^. — Styles 5. Ovary 1-oelled and 1-seeded. 144 



* * * Stamens just as Tnany as the lohes of the corolla, inserted on 



its tube alternately with its lobes. 



•i- Ovaries 2, separate. 



Apooynace^. — Plants with milky juice. Anthers converg- 

 ing round the stigmas, but not adherent to them. 

 Filaments distinct 179 



AscLEPiADACE^. — Plants With milky juice. Anthers ad- 

 hering to the stigmas. Filaments monadelphous. 

 Flowers in umbels 179 



■i- -t- Ovary 4-lobed around the base of the style. 



Mentha, in 



LABIAT.E. — Stamens 4. Leaves opposite, aromatic 160 



BoRKAGiNACE^. — Stamens 5. Leaves alternate 167 



H — 1 — i- Ovary 1-celled ; the seeds ore the walls. 



HydkophyHjAOE.3E. — Stamens 5, usually exserted. Style 



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



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



yanthes) of 3 leaflets 176 



-(- -1- -I- -4- Ovary with S or more cells. 



AquifoliacBjE. — Shrubs. Corolla almost pnlypetalous. 



Calyx minute. Fruit a red berry-like drupe. 



Parts of the flower chiefly in fours or sixes 145 



PLANTAGIXACE.S). — Stamens 4. Pod 2-celled. Flowers in 



a close spike 148 



Verbaseum, in 



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

 long terminal spike. Stamens 5 ; the filaments, 

 or some of them, woolly 151 



P0LBMONIACE.S:. — Style 3-cleft. Corolla salver-shaped, 

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

 seeds small 172 



