26 ANALYTICAL KEY. 



Ovary and pod superior, i. e. free from the calyx. 



Five-celled and 5-beaked, opening across the beaks, which 



fall off at maturity ; stamens 10. Penthornm, in CRASSULACEiE, 176 

 Three-celled and 3-valved, or 3-.5-celled and circumscissile. Ficoide^, 198 

 Two-celled or one-celled ; placentas central. 



Stamens inserted on the throat or tube of the calyx. Lythrace^, 184 

 Stamens inserted o: the receptacle or the base of the calyx, 



Alternate with the .5 sepals. . . • Glaux, in Primulace^, 331 

 Opposite the sepals when of the same number. CARvopHTLLACEiE, 82 

 One-celled, with one parietal placenta. I . . EANUNCULACEiE, 34 



Ovaries 2 or more, separate, simple. ' 



2. Ovanj or its cells containing onlij 1 or 2, rarel// 3 or 4, ovules. 

 * Pistils more than one, and distinct or nearli/ so. 



Stamens inserted on the calyx ; leaves with stipules, . . Eosace^, 150 

 Stamens inserted on the receptacle. 



Leaves punctate with pellucid dots. . Xanthoxylura, in RuTACEiE, 106 

 Leaves not dotted. 



Calyx present, and usually colored or petal-like. Ranunculace^, 34 

 Calyx absent ; flowers entirely naked, perfect, spiked. Piperace^, 446 



* * Pistil one, either simple or compound. 



Ovary partly inferior, the calyx coherent to its lower half, 



2-celled ; styles 2 ; stamens many. . . Hamamelide^, 179 



Ovary wholly inferior (in perfect or pistillate flowers). 



Aquatic herbs ; ovary 3-4-celled, or (Ilippuris) 1-celled. Hai.orage^, 180 

 Mostly Avoody plants; style or stigma one, entire ; ovary 1-celled. 



Stigma running down one side of the style. Nyssa, in Corxace^, 215 

 Stigma terminal, with or without a style. 



Parasitic on the branches of trees ; anthers sessile. Loranthace^, 449 

 Not parasitic above ground ;Ha»tliers on filaments. Saxtalace-s:, 450 

 Ovary really free from the calyx, but permanently invested by its 

 tube, or the base of it, so as to seem inferior. 

 Shrubs, with scurfy leaves; flowers mostly dioecious. El^eagnace^, 448 

 Herbs, with the calyx colored like a corolla. 



Leaves opposite, simple Ntctaginace^, 425 



Leaves alternate, pinnate. . . . Poterinm, in Rosacea, 161 



Ovary plainly free from the calyx, Avhich is sometimes wanting. 

 Stipules (ocrese) sheathing the stem at the nodes. 



Tree ; calyx none ; flowers monoecious, in heads. Plataxace^, 466 



Herbs ; calyx present and commonly petal-like. PoLYGOXACEiE, 436 



Stipules not sheathing the stem, or none. 

 Aquatic herbs, submerged or nearly so. 



Leaves Avhorled and dissected ; style single. Ceratophyllace.^, 488 

 Leaves opposite, entire; styles 2 ; ovary 4-celled. Halorage^, 180 

 Not aquatics, herbs. 



Ovary 10-celled; berry 10-seeded. . . Phytolaccace^, 435 



Ovary 3- (rarely 1-2-) celled ; juice usually milky. Euphorbiace^, 451 



