DSOSBJSACEAE. 167 



.3. Droseka PIUPO^Dtls Eaf . M. p. 471. Wet sand fleaT the coast. Summer. 

 New Jersey— Common. 



Order 14. ROSALES. 



Small, aquatic, fleshy herbs, with a spathe-like involucre and a 2-3-celled 



capsule; perianth none. Fam. 1. Podostemaceae. 



Land or rarely swamp plants without an involucre. 



Endosperm present, usually copious and fleshy; leaves mostly without 

 stipules. , . . 



Herbs. 



Carpels as many as the calyx-segments; stamens as many or 

 . twice as many. - i »•* . ■ 



Plants succulent; carpels distinct or united at the base, 



dehiscent lengthwise..: . Fam. 2. Crassulaceae. 

 Plants not succulent; carpels .united to the middle, cireum- 

 scissile. Fam. 3. Penthoraceae. 



Carpels fewer than the calyx-segments. 



Staminodia present; carpels 3 or 4, wholly united into a 



one-celled ovary. Fam; 4. Pa^nassiaceae. 



Staminodia none; carpels mostly 2, their upper part at 

 least distinct. Fam. 5. Saxifragaceae. 



Shrubs or trees. 



Leaves opposite. , Fam. 6. Sydrangeaeeae. 



Leaves alternate. 



Fruit a 2-celled, thin-walled capsule; its base adnate to 



the calyx. Fam. 7. Iteaceae. 



Fruit a l'-celled berry. . Fam. 8. Grossulariaceae. 



Fruit a 2-eelled, woody, hard capsule. 

 ... , Fam. 9. MamameUdaceae. 



Endosperm none, or very little (copious in Opulaster). - 



Trees with broad leaves and small, monoecious, densely capitate 



flowers. Fam. 10. Platanaceae. 



Flowers perfect, or if dioecious or monoecious, not densely capitate. 

 Flowers tegular. 



Pistils several or numerous; if only one, as in Bangui - 

 sorba, it becomes a dry, one-seeded aehene. 

 Carpels distinct, ralrely adnate to the ealyx, ripening 

 into follicles or achenes. 



Fam. 11. Bosaoeae. 

 Carpels united, enclosed by the calyx-tube and adnate 

 to it, the fruit a pome. Fam. 12. Pomaceae. 

 Pistil only one. 



Ovary 2-6vuled; fruit a drupe; leaves simple. 



Fam. 13. Drupaceae. 

 Ovary several-ovuled ; fruit a, legume; leaves 2-3 -pin- 

 nate. 

 Petals valvate in the bud. 



Fam. 14. Mimosaceae. 

 Petals imbricated in the bud; Gleditsia and Gym- 

 nocladus in Caesalpinaceae. , , 



Flowers irregular (nearly or quite regular in Gleditsia and 

 Gymnocladus). 

 Fruit -a legume; upper petal enclosed by the lateral ones 

 in the bud; leaves compound, mostly stipulate. 



i :,/•! , i (Fam. 15. Caesalpinaceae. 

 Fruit a legume or lpment ; upper petal enclosing the lat- 

 eral ones in the bud; leaves compound (sometimes 1- 

 foliolate), stipulate. Fam; 18; ' PapiliOHaceae. 



