XV111 KEY TO THE ORDERS. 



A. Calyx superior (adherent to the ovary). 



* Stamens united by their anthers. 



CITCURBITACE^E. Tendril-bearing herbs f>2 



COMPOSITE. Flowers in heads, surrounded by an involucre. 64 

 LOBELIACE^E. Flowers not in heads. Corolla split down 



one side 83 



* Stamens not united together in any way. 

 +- Stamens inserted on the corolla. 



DIPSACE^E. Flowers in heads, surrounded by an involucre. 



Plant prickly 03 



VALERIANACEJS. Flowers white, in clustered cymes. Sta- 

 mens fewer than the lobes of the corolla. , 63 



RUBIACE^:. Leaves, when opposite, with stipules ; when 

 whorled, without stipules. Flowers, if in heads, 

 without an involucre 61 



CAPRIFOLIACE.E. Leaves opposite, without stipules ; but, 



in one genus, with appendages resembling stipules. 58 



Stamens not inserted on the corolla. 



CAMPANULACE^. Herbs with milky juice. Stamens as 



many as the lobes of the corolla 84 



ERICACEAE. Chiefly shrubby plants or parasites. Stamens 



twice as many as the lobes of the corolla. ....... 85 



B. Calyx inferior (free from the ovary). 



* Stamens more than the lobes of the corolla. 



LEGUMINOS^E. Ovary 1 -celled, with 1 parietal placenta. Sta- 

 mens mostly diadelphous 33 



Adlumia, in 



FUMARIACE^E. Plant climbing. Corolla 2-spurred 11 



MALVACEAE. Filaments monadelphous. Carpels in a ring. 24 

 ERICACEAE. Chiefly shrubby plants, with simple entire 

 leaves. Stamens twice as many as the lobes of the 



corolla 85 



POLYGALACE^E. Anthers 6 or 8, 1 -celled, opening at the 

 top. Pod 2-celled. Flowers irregular ; lower petal 



keel-shaped, and usually fringed at the top 32 



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

 distinct. Leaflets 3, obcordate, drooping at night- 

 fall... 27 



