KI:V T<> TIII: ORDERS. 



Style single. Pnl or berry 2-eelled, many- 

 seeded 110 



* * * * Stamens fewer thaw the lobes of the corolla; the corolla 

 mostly irregular or 2- lipped. 



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



Stamens 4 and didynamous, or occasionally only 2 



with anthers. Stem square 100 



YKKBENACE.*;. Ovary 4-celled, but not lobed ; the style 



rising from the apex. Or, Ovary 1-cellcd and 1- 



seeded. Stamens didynamous !! 



LE.NTIBULACE.*:. Aquatics. Stamens 2. Ovary 1 -celled, 



with a free central placenta. . . '. O.'J 



OROBANCHACE.E. Parasitic herbs, without green foliage. 



Ovary 1-celled, with many seeds on the walls. 



Stamens didynamous. ! > I 



SCROPHULARIACE.E. Ovary 2-celled, with many seeds. 



Stamens didynamous, or only 2 !)4 



III. APETALOUS DIVISION. 



Corolla (and sometimes calyx also) wanting. 



A. Flowers not in catkins. 



* Calyx and corolla both wanting. 



SAURURACE^E. Flowers white, in a dense terminal spike, 

 nodding at the end. Carpels 6 or 4, nearly separ- 

 ate 124 



CERATOPHYLLACE^E. Immersed aquatics, with whorled 



finely dissected leaves. Flowers monoecious 1'Jl 



* * Calyx superior (i.e., adherent to the ovary ). 



SAXIFRAGACE^E. Small, smooth herbs, with inconspicuous 

 greenish-yellow flowers. Stamens twice as many 

 as the calyx -lobes, on a conspicuous disk 46 



HALORAGE.E. Aquatics. Leaves finely dissected or linear. 



Stamens 18. Ovary 4-lobed or (Hippuris) 1-celled. 49 



ONAGRACE.*:. Herbs, in ditches. Stamens 4. Ovary 4- 



celled, 4-sided 49 



ARISTOLOCHIACE^E. Calyx 3-lobed, dull purple inside. 



Ovary 6-celled 116 



SANTALACE^E. Low plants with greenish-white flowers in 

 terminal clusters. Calyx-tube prolonged, and 

 forming a neck to the 1-celled nut-like fruit 124 



