KEY TO THE FAMILIES 



Leaves without traces of stipules. 



Stamens 5, if only 3-4, not didynainous. 



Fruit a capsule or berry; ovary not 4-lobed. 

 Styles or stigmas usually distinct. 



Parasitic twining plants, with scale- 

 like leaves. 



108. CUSCTJTACEAE G77 



Plants not parasitic; leaves normal. 

 Inflorescence not scorpioid; flowers 

 cymose or solitary ; ovary 2-3 

 celled. 

 Corolla plaited and the plaits 

 convolute in the bud; flow- 

 ers axillary, solitary or 

 cymose-conglomerate; plants 

 usually twining. 



107. CONVOLVULACEAE 674 



Corolla merely convolute in the 

 bud, not plaited; flowers 

 cymose; plants never twin- 

 ing. 



109. POLEMONIACEAE 679 



Inflorescence more or less dis- 

 tinctly scorpioid; ovary in 

 ours 1 -celled or imperfectly 

 2-celled. 

 Fruit a capsule. 



110. Hydrophyllaceae 699 

 Fruit more or less drupaceous. 



111. Ehketiaceae 710 

 Styles and stigmas wholly united. 



OviUes few. 109. CONVOLVULACEAE 674 



Ovules numerous. 



Median axis of the gynoecium in 

 the same plane as the axis of 

 the stem; seeds mostly pitted. 



116. SOL.\NACEAE 753 



Median axis of the gynoecium not 

 in the same plane as the axis of 

 the stem; seed tuberculate. 

 (.Verbascum hi) 



117. SCROPHUL.\RL\CEA E 760 



Fruit of 1-4 nutlets; ovary more or less dis- 

 tinctly 4-lobed. 

 Style or stigma furnished with a glandular 



ring. 112. Heuotropaceae 711 



Style or stigma not furnished with a 

 glandular ring. 

 Fruit 4 dry nutlets. 



113. Boraginace.\e 712 

 Fruit more or less drupaceous. 



111. Ehretiaceae 710 



Stamens 4 and didynamous, or 2 or 1. 



Stamens 2 and opposite to each other; corolla 



regular. 101. Oleaceae 655 



Stamens, if 2, not opposite to each other, 

 nor the corolla regular. 

 Carpels ripening into 2 or 4 nutlets, an 

 achene, or a drupe. 

 Style apical on the lobeless ovary. 



114. Verbenaceae 739 

 Style arising between the 4 lobes of 



the ovary. 



115. Lamiace.\e 741 

 Carpels ripening into a capsifle. 



Placentae of the ovary axile. 



Ovary 2-celled, rarely 3-5-ceUed; 

 land-plants. 



117. SCROPHUL.\RL^CEAE 760 



Ovary 1 -celled; ours submerged 

 water plants or bog plants. 



118. Lentibulariaceae 801 

 Placentae of the ovary parietal. 



Herbs parasitic on the roots of 

 other plants: leaves scale-like, 

 not green. 



119. Orobanchaceae 802 

 Herbs with green leaves, not para- 

 sitic. 120. Martynlvceae 804 



