10 KEY TO THE FAMILIES 



*♦ Corolla scarious, veinless; fruit a pyxis. 



121. Plantaginaceae sot 

 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. C.'VMP.^.NUL.'i.CEAE 822 



Corolla irregular; anthers united. 131. Lobeliaceae 824 



Stamens adnate to the corolla. 



Ovary with 2-many fertile cavities and 2-many ovules; caly.\ un- 

 modified, at least not a pappus. 

 Plants tendril-bearing. 129. Cucurbitaceae 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. Santal.\ceae 817 



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

 not parasitic. 

 Stamens as many as the corolla-lobes. 



Leaves witli 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. C.\prifoliaceae 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. Dip.sace.ae 827 



Flowers unisexual, not involucellate; anthers basifixed. 



133. Ambrosiaceae 827 

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



the flowers hermaphrodite and anthers basifixed. 



134. Carduaceae 833 

 Flowers all with ligulate coroUas. 13.5. Cichori.^^ceae 1015 



