ANALYTICAL KEY FOR EXOGENS. 



Drv'isiON 1. Polypetalas; calyx and corolla both present, the latter of separate 

 petals. 



A. Stamens more than 10, and more than double the number of petals. 



1. Hijpogijnou^, i. c, on the receptach (rareli/ adluirinrj to the petals.) 

 Pistils, few to many distinct carpels, rarely one. 



Calyx mostly deciduous; juice colorless Ranunculaceas. IG 



Calyx early deciduous; juice yellowish Papaveraceae, 20 



Calyx jiersistent; leaves peltate Nyraphceaoece, 20 



Pistil comjjound; cells or stigmas more than one. 

 Petals more numerous than the sepals. 



Indefinitely numerous, small and persistent; aquatic ITymphseaceae, 20 



Just twice as many (4 or G), and both usually caducous Papaveraceae, 20 



Five to IG, and more numerous than the persistent sepals PortulacacccS, 29 



Petals of the same number as the sepals. 

 Five, and the calyx persistent. 



Sepals valvate in the bud; stamens all united Malvaceas, 31 



Sepals overlapping in tlie bud (imbricated). 



Leaves opposite, entire, transparent-dotted Hypericaces, 30 



Leaves alternate, not dotted (punctate). 



Two outer sepals smaller .". Cistaceae, 25 



2. Perhjynous or epvjynoits (on the free or adnate calyx). 



Fleshy herbs, with 3 or more cells to the ovary Ficoidea;, 63 



Fleshy herbs, with 1-celled ovary PortulacacecS, 29 



Not fleshy; herbs or shrubs. 



Leaves opposite, simple; sepals and petals numerous Calycan'claaceaB, 55 



Leaves opposite, simple; sepals and petals 4 or 5 Sa2:ifragacea°, 55 



Leaves alternate, with stipules RosaceEe, 49 



Leaves alternate, without stipules; rough herbs •■. .... .Loasace^, G2 



B. Stamens 10 or less, or if more, not exceeding twice the number of petals, or 

 sepals. 



1. Ovary or ovaries superior or mainly so (but sometimes inclosed in the calyx-tube). 

 * Pistils more than one, and distinct. 

 Pistils of the same number as petals and sepals. 



Leaves simple, fleshy Crassulaceae, 58 



