DEOSEBACEAE. 167 



3. Drosera filiformis Raf. M. p. 471. Wet sand near the coast. Summer. 

 New Jersey— Common. 



Order 14 ROSALES. 



SmaD, 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. 

 Plants succulent; carpels distinct or united at the base, 



dehiscent lengthmse. Fam. 2. Crassulaceae. 



Plants not succulent; carpels united to the middle, circum- 

 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. Parnassiaceae. 



Staminodia none; carpels mostly 2, their upper part at 

 least distinct. Fam. 5. Saxifragaceae. 



Shrubs or trees. 



Leaves opposite. Fam. 6. Hydrangeaceae. 



Leaves alternate. 



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



the calyx. Fam. 7. Iteaceae. 



Fruit a 1-celled berry. Fam. 8. Grossulariaceae. 



Fruit a 2-ceUed, woody, hard capsule. 



Fam, 9. Hamamelidaceae. 

 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 regular. 



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

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

 Carpels distinct, rarely adnate to the calyx, ripening 

 into follicles or achenes. 



Fam. 11. Eosaceae. 

 Carpels united, enclosed by the calyx-tube and adnate 

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

 Pistil only one. 



Ovary 2-ovuled; 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 onea 

 in the bud; leaves compound, mostly stipulate. 



Fam. 15. Caesalpinaceae. 

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

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

 foliolate), stipulate. Fam. 16. Papilionaceae. 



