KEY. 165 



obovate, or wedge-shaped. Flowers sessile. Sepals keeled. 

 Petals pale yellow. Stamens 7-12, rarely more. 



(206) Portulaca. 

 Calyx 5-toothed or cleft 316 



310. Thorny shrubs. Styles 1-5 56 



Herbs, or unarmed shrubs and trees 317 



317. I. Pistil one. Flowers dioeciously polygamous (per- 

 fect flowers intermixed with pistillate and staminate ones). 

 Trees. Fruit a drupe 859 



II. Pistil one. Flowers perfect. Herbs. Pod short, 

 2-beaked. Ovary half-inferior ; styles 2. Stamens 10. Leaves 

 heart-shaped and 3- to 5-lobed, or reniform and crenate. 



(192) Mitella. 



III. Pistils 2, separate or partly united 318 



IV. Pistils 5. Stamens 10-20. Calyx-tube narrow. 

 Petals slender, slightly unequal. Flowers in panicled 

 corymbs, pale rose-color or white. Leaves trifoliolate. 



Gilleuia. 



318. Shrubs with simple, ovate, rarely heart-shaped, 

 opposite, petioled leaves 278 



Herbs with compound leaves 319 



319. Calyx-tube beset with hooked bristles ; top-shaped. 

 Stamens 12-15. Leaves interruptedly pinnate. Flowers 

 yellow, in slender spikes or racemes. Agrimonia. 



Calyx-tube naked. Stamens 10. Pod 2-celled, 2- 

 horned, or 2, almost separate follicles. Leaves simple, entire, 

 toothed, lobed, or cleft, often radical. (192) Saxifraga. 



B. COROLLA GAMOPETALOUS. 



(320-536.) 



330. (78.) Ovary, or ovaries superior 321 



Ovary inferior 507 



331. Corolla regular, or nearly so; its lobes or segments 

 perfectly or almost equal (in one genus each, with a little 

 spur at the base) 322 



