10 KEY TO THE FAMILIES 



** Corolla Bcarious, veinless; (niit a pyxis. 



121. Plantaginaceae 80 1 



B. Ovary inferior. 



Stamens with the filaments free from the corolla. 



Stamens 10; anther-sacs opening by terminal pores or chinks. 



99. Vacciniaceae 643 



Stamens 5 or fewer; anther-sacs opening by longitudinal slits 



Corolla regular; anthers distinct. 130. Campanulaceae 822 



Corolla irregular; anthers united. 131. Lobeliaceae 824 



Stamens adnate to the corolla. 

 , Ovary with 2-many fertile cavities and 2-many ovules; calyx un- 



modified, at least not a pappus. 

 Plants tendril-bearing. 129. Cuctjrbitaceae 821 



Plants not tendril-bearing. 



Ovules mostly on basal placentae; plants parasitic or saprophy- 

 tic. 

 Leaves opposite; fruit a berry; tree-parasites. 



125. Loranthace.\e 816 



Leaves alternate; fruit a drupe or nut; root-parasites or 



saprophytes. 126. Santal..\ceae 817 



Ovules variously borne, but not on a basal placenta; plants 

 not parasitic. 

 Stamens as many as the corolla-lobes. 



Leaves with stipules (often leaf-like and usually re- 

 garded as leaves) adnate to the stem between the 

 leaf-bases. 122. Rubiaceae 806 



Leaves without stipules or if present these adnate to 



the petioles. 123. Caprifoliaceae 810 



Stamens twice as many as the corolla-lobes; low herbs with 



ternately dissected leaves. 124. Adoxaceae 816 



Ovary with one fertile cavity; calyx often modified into a pappus. 

 Flowers not in heads, often in head-like spikes or racemes. 



127. Valerianaceae 818 



Flowers in involucrate heads. 



Flowers aU with tubular corollas or none, or only the ray- 

 flowers with ligulate coroUas. 

 Stamens distinct. 



Flowers hermaphrodite, surrounded by a cup-like in- 



volucel ; anthers versatile. 132. Dipsaceae 827 



Flowers unise.\ual, not involucellate; anthers basiflxed. 



133. Ambrosiaceae 827 

 Stamens united by tlie anthers, or if distinct (in Kuhnia) 



the flowers hermaphrodite and anthers basiflxed. 



134. Carduace.\e 833 

 Flowers all with li^ate corollas. 135. Cichoriaceae 1015 



