56 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



11. Anther-bearing stamens 4 or 2; capsule 2-valved (12). 



12. Ovary 1 -celled; fruit large, ending in a long incurved hooked 



beak 112. Martyniaceae. 



12. Ovary 2-celled; fruit not with a long hooked beak (13). 

 13. Capsule long and slender; seeds comose or winged. 



111. BlGNONIACEAE. 



13. Capsule not long and slender; seeds not comose, rarely 

 winged (14). 

 14. Seeds usually indefinitely numerous, commonly sessile, 

 with copious endosperm; cotyledons narrow. 



110. SCROPHULARIACEAE. 



14. Seeds not more than 10 (often only 2) in each cell, stalked, 

 the endosperm scanty or none; cotyledons broad. 



114. ACANTHACEAE. 



1. Corollas regular or nearly so (15). 

 15. Ovary inferior (16). 



16. Flowers in heads subtended by an involucre; fruit an achene; calyx limb 



reduced to bristles, scales, teeth, etc 121. Compositae. 



16. Flowers not in heads subtended by an involucre (17). 

 17. Stamens free from the corolla or very nearly so (18). 



18. Corolla lobes and stamens indefinitely numerous; plants very 



succulent 85. Cactaceae. 



18. Corolla lobes not more than 5; stamens 10 or fewer; plants not or 

 scarcely succulent (19). 

 19. Plant shrubby; corolla cylindric or urceolate; anthers opening by 

 terminal pores; fruit a berry: Genus Vaccinium. 



94. Ericaceae. 

 19. Plants herbaceous; corolla campanulate or rotate; anthers splitting 

 longitudinally (20) . 

 20. Flowers unisexual (rarely perfect) ; stamens commonly more or 

 less united; stems climbing or trailing; corolla yellow or whit- 

 ish; fruit various 119. CUCURBITACEAE. 



20. Flowers mostly perfect; stamens separate; stems erect; corolla 

 normally blue or violet; fruit a capsule, opening by pores or 

 valves: Subfamily Campanuloideae_ 120. Campanulaceae. 

 17. Stamens borne on the corolla (21). 



21. Calyx limb reduced to bristles, these elongate and plumose in fruit; 



plants herbaceous ■.-'. 118. Valerianaceae. 



21. Calyx limb not reduced to bristles (22). 



22. Fruit dry, a capsule, or achenelike, or separating at maturity into 



2 or 4 usually closed carpels 116. Rubiaceae. 



22. Fruit berrylike or drupelike or, if achenelike, then the stems creep- 

 ing and the flowers in pairs, nodding on long slender peduncles. 



117. Caprifoliaceae. 

 15. Ovary superior (free from the calyx) or very nearly so (23). 



23. Stamens more or less united by the filaments or the anthers (24). 



24. Leaves bipinnate; stamens much more conspicuous than the small 

 corolla; flowers in heads or spikes: Subfamily Mimosoideae. 



54. Leguminosae. 

 24. Leaves simple, sometimes pedately cleft or parted (25). 

 25. Flowers unisexual; seeds carunculate: Genus Jatropha. 



64. EUPHORBIACEAE. 



25. Flowers perfect-; seeds not carunculate (26). 



26. Corolla only slightly gamopetalous; stamens numerous; fruit of 

 several separating carpels, or a several-celled capsule. 



74. Malvaceae. 

 26. Corolla strongly gamopetalous; stamens 5 (27). 



27. Ovaries 2, connected only by the united stigmas; pollen grains 

 in masses; filaments united into a column; fruit a pair of 



follicles 102. Asclepiadaceae. 



27. Ovary 1, usually 2-celled; pollen grains separate; anthers more 

 or less connate; fruit a berry: Genus Solanum. 



109. SOLANACEAE. 



23. Stamens separate (28). 



28. Filaments free from the corolla or very nearly so (29). 



29. Leaves bipinnate; stamens much more conspicuous than the small 

 corolla ; flowers in dense heads or spikes : Subfamily Mimosoideae. 



54. Leguminosae. 



