16 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Ovary several-celled. 
Upper portion of ovaries distinct.(Crassulaceae) 27, ROSALES (p. 291). 
Upper portion of ovaries united.......-.-.---- 41. EBENALES (p. 495). 
Stamens as many as the lobes of the corolla and alternate with them or fewer. 
Corolla scarious, veinless; fruit a pyxis..46. PLANTAGINALES (p. 602). 
Corolla not scarious, veiny; fruit not a pyxis. 
Carpels distinct, except sometimes at the apex. 
Style terminal................2200- 44. ASCLEPIADALES (p. 503). 
Style basal......-. (Dichondraceae) 45. POLEMONIALES (p. 513). 
Carpels united. 
Ovary 1-celled, with central placentx...43. GENTIANALES (p. 497). 
Ovary 2 or 3-celled or falsely 4-celled, or if 1-celled with parietal 
placenta......-..- cece eee eeeee 45. POLEMONIALES (p. 513). 
Petals distinct, at least at the base. 
Carpels solitary, or several and distinct, or united only at the base. 
Stamens on the margin of a hypanthium (this very small in some Saxifragaceae). 
27. ROSALES (p. 291). 
Stamens at the base of the receptacle, hypogynous. 
Flowers in moneecious heads. ..-...-- (Platanaceae) 27. ROSALES (p. 291). 
Flowers not in moneccious heads. 
Plants with firm stems and leaves, not succulent. .25. RANALES (p. 243). 
Plants with succulent stems and leaves, 
(Crassulaceae) 27. ROSALES (p. 291). 
Carpels several and united. 
Ovary inferior. 
Stamens numerous. 
Hypanthium produced beyond the ovary. 
(Families of) 87, MYRTALES (p. 459). 
Hypanthium not produced beyond the ovary. 
Ovary partly inferior........ (Hydrangeaceae) 27. ROSALES (p. 291). 
Ovary wholly inferior..............-.---- 385. OPUNTIALES (p. 431). 
Stamens not more than twice as many as the petals. 
Styles wanting. (Stigmas sessile; aquatics.) 
(Gunneraceae) 87. MYRTALES (p. 459). 
Styles present. 
Styles distinct. 
Ovules solitary in each cell; fruit a drupe or of 2 to 5 more or less united 
achenes. .....2------ eee eee ee ee eee 38. UMBELLALES (p. 474). 
Ovules several in each cell; fruit a capsule or a fleshy, many-seeded, 
berry. 
. Fruit, if dehiscent, valvate..(Families of) 27. ROSALES (p. 291). 
Fruit circumscissile. 
(Portulacaceae) 24. CHENOPODIALES (p. 198). 
Styles united or single. 
Plants with tendrils; fruit a pepo. 
(Cucurbitaceae) 48. CAMPANULALES (p. 612). 
Plants without tendrils; fruit not a pepo. 
Ovary exceeding the hypanthium, the top free. 
(Hydrangeaceae) 27. ROSALES (p. 291). 
Ovary inclosed in or surpassed by the hypanthium or adnate to it. 
Ovules solitary in each cell......... 88. UMBELLALES (p. 474). 
Ovules several in each cell. 
Ovary with parietal placenta. 
(Loasaceae) 385. OPUNTIALES (p. 431). 
Ovary with central or basal placente. 
(Families of) 87. MYRTALES (p. 459). 
