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 2-3 

 celled. 

 Corolla plaited and the plaits 

 convolute in the bud; flow- 

 ers axillary, solitary or 

 cymose-conglomerate; plants 

 usuaUy twining. 



107. COJTS'OLVTJLACEAE 674 



CoroUa 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 

 oiu"s 1 -celled or imperfectly 

 2-celled. 

 Fruit a capsule. 



110. Htdrophyll.\ceae 699 

 Fruit more or less drupaceous. 



111. Ehretiaceae 710 

 Styles and stigmas wholly united. 



Ovules few. 109. Convol^tjlaceae 674 



Ovules numerous. 



Median axis of the gynoecium in 

 the same plane as the axis of 

 the stem; seeds mostly pitted. 



116. SOL.\JSfACEAE 753 



Median axis of the gj-noecium not 

 in the same plajie as the axis of 

 the stem; seed tuberculate. 

 {Verbascum in) 



117. SCROPHUL-tRIACEAE 760 



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

 tinctly 4-lobed. 

 Style or stigma furnished with a glandular 



ring. 112. Heliotropaceae 711 



Style or stigma not fiu-nished with a 

 glandular ring. 

 Fruit 4 dry nutlets. 



113. Boraginaceae 712 

 Fruit more or less drupaceous. 



111. EHRETIACE.'VE 710 



Stamens 4 and didynamous, or 2 or 1. 



Stamens 2 and opposite to each other; coroUa 



regular. 101. Oleaceae 655 



Stamens, if 2, not opposite to each other, 

 nor the coroUa 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. Laml-vceae 741 

 Carpels ripening into a capsule. 



Placentae of the ovary axile. 



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

 land-plants. 



117. SCROPHUL.VRIACEAE 760 



Ovary l-ceUed; oiors 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 



