KEY TO THE FAMILIES 



Leaves without traces of stipules. 



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



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

 Styles or stigmas usually distinct. 



Parasitic twining plants, with scale- 

 like leaves. 



108. CUSCUTACEAE 677 



Plants not parasitic; leaves normal. 

 Inflorescence not scorpioid; flowers 

 cymose or solitary ; ovary 23 

 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. EHRETIACEAE 710 

 Styles and stigmas wholly united. 



Ovtiles 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. SOLANACEAE 753 

 Median axis of the gynoecium not 



in the same plane as the axis of 

 the stem; seed tuberculate^ 

 (Verbascum in) 



117. SCROPHULARIACEAE 760 

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

 tinctly 4-lobed. 



Style or stigma furnished with a glandular 

 ring. 112. HELIOTROPACEAE 711 



Style or stigma not furnished with a 



glandular ring. 

 Fruit 4 dry nutlets. 



113. BORAGINACEAE 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. LAMIACEAE 741 

 Carpels ripening into a capsule. 



Placentae of the ovary axile. 



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

 land-plants. 



117. SCROPHULARIACEAE 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. MARTYNIACEAE 804 



