GAMOPETAL.E. ] 3 



Flower parts in 4's (rarely in 2's or 6's): style 1 Onagraceae, 39 



Flowers monoecious: climbing by tendrils Cucurbitaceae, 43 



Flowers with 2 sepals and 5 petals: fleshy herbs Portulacaceae, 26 



Flowers in umbels or heads not axillary 



Flowers in umbels or heads: petals 5: stamens 5. 



Styles 2: fruit dry Umbelliferse, 44 



Styles 2 to 5: fruit juicy Araliaceae, 43 



Flowers in a head with involucre of 4 white leaves Cornaceae, 44 



DIVISION 2.-GAMOPETAL^E. 



A. OVARY INFERIOR (adherent to the calyx) or mainly so. 



Stamens 8 or 10: corolla-lobes 4 or 5: shrubs Ericaceae, 48 



Stamens 10, those alternate with small corolla-lobes sterile, inflexed Samoht*, 142 



Stamens 5 (rarely 4) united into a tube. 



Style 2-cleft: flowers in a flower-like head Compositae, 46 



Style and stigma entire: flowers irregular Lobeliaceae, 47 



Stamens 4 or 5, distinct, growing at the base of the corolla Campanulacees, 48 



Stamens on the corolla-tube: leaves opposite or whorled. 



Leaves connate; corolla 4-lobed; stiff, prickly herbs Dipsacw, 46 



Leaves opposite, corolla mostly 5-lobed Caprifoliaceae, 45 



Leaves whorled or sometimes opposite: corolla 4-lobed ...... .Rubiaceae, 45 



Leaves unequal: prostrate: calyx corolla-like Abronia, 69 



Stamens only 3: corolla 5-6 lobed; calyx-lobes minute or none. Herbs. 



Leaves opposite; stamens distinct: erect herbs Valerianaceae, 46 



Leaves palmately nerved, alternate: tendril-bearing vines. ..Cucurbitaceae, 43 



Stamens apparently 1, really 3 united: flowers monoecious Cucurbitaceae, 43 



B. OVARY SUPERIOR (free from the calyx) or nearly so. 



1. Flowers regular or nearly so. 



* Stamens many, united, and adherent to the petals Malvaceae, 27 



** Stamens twice as many as the lobes of the corolla. 



Corolla bell-shaped or inflated ovoid Ericaceae, 48 



Corolla deeply 5-8 cleft, the base united with the filaments Styracaceae, 50 



Corolla 5-cleft: pistils or styles 5; fleshy herbs ... . Crassulaceae, 38 



