10 KEY TO THE FAMILIES 



♦* Corolla Bcaxious, veinless; fruit a pyxis. 



121. PLANTAGINACEAE 801 



Ovary inferior. 



Stamens with the filaments free from the corolla. 



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



99. Vacciniaceae 643 



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



CoroUa regular; anthers distinct. 130. Oampantilaceae 822 



Corolla irregular; anthers united. 131. Lobell^ceae 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. CuctTRBITACEAE 821 



Plants not tendril-bearing. 



Ovules mostly on basal placentae; plants parasitic or saprophy- 

 tic. 

 Leaves opposite; fruit a berry; tree-parasites. 



125. LORANTHACEAE 816 



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



saprophytes. 126. Santalaceae 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. Rxjbiaceae 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. Adoxaceab 816 



Ovarv 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 all with tubular corollas or none, or only the ray- 

 flowers with ligulate corollas. 

 Stamens distinct. 



Flowers hermaphrodite, surrotmded by a cup-like in- 



volucel; anthers versatile. 132. Dipsaceae 827 



Flowers unisexual, not involucellate; anthers basiflxed. 



133. AMBROSTACEAE 827 



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

 the flowers hermaphrodite and anthers basiflxed. 



134. Carduaceae 833 



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



