XVill KEY TO THE ORDERS. 



OXALIDACE^E. Stamens 10, 5 of them longer. Styles 5, 

 distinct. Leaflets 3, obcordate. drooping at night' 

 fall 42 



* * Stamens just as many as the lobes of the corolla, one in ,/ront 



of each lobe. 



PRIMULACE.E. Stamens on the corolla. Style 1. Ovary 

 1 -celled, with a free central placenta rising from 

 the base 145 



PLTJMBAGINACE^E. Styles 5. Ovary 1-celled and 1 -seeded. 144 



* * * Stamens just as many as the lobes of the corolla, inserted on 



its tube alternately with its lobes. 



4- Ovaries 2, separate. 



APOCYNACE^E. Plants with milky juice. Anthers converg- 

 ing round the stigmas, but not adherent to them. 

 Filaments distinct 179 



ASCLEPIADACEJS. Plants with milky juice. Anthers ad- 

 hering to the stigmas. Filaments monadelphous. 

 Flowers in umbels 179 



4- 4- Ovary 4~lobed around the base of the style. 

 Mentha, in 



LABIATE. Stamens 4. Leaves opposite, aromatic 160 



BoRRAGiNACEvE. Stamens 5. Leaves alternate. 167 



4-4 *- Ovary 1-celled ; the seeds on the walls. 



HYDROPHYLLACE^E. Stamens 5, usually exserted. Style 



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



GENTIANACE^E. Leaves entire and opposite ; or (in Men- 



yanthes) of 3 leaflets 176 



4-4-4-4- Ovary with 2 or more cells. 



AQUIFOLIACE^. Shrubs. Corolla almost poly petal ous. 



Calyx minute. Fruit a red berry-like drupe. 



Parts of the flower chiefly in fours or sixes 145 



PLANTAGINACE^E. 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 



POLEMONIACE.E. Style 3-cleft. Corolla salver-shaped, 



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



seeds small. 172 



