26 ANALYTICAL KEY. 



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



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



fall off at maturity ; stamens 10. Penthorum, in Crassulace^, 176 

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

 Two-celled or one-celled ; placentae central. 



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

 Stamens inserted oi 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. Caryophyllace^, 82 

 One-celled, with one parietal placenta. I . . , Ranunculace.e, 34 

 Ovaries 2 or more, separate, simple. ) 



2. Ovary or its cells containing only 1 or 2, rarely 3 or 4, ovules. 

 * Pistils more than one, and distinct or nearly so. 



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

 Stamens inserted on the receptacle. 



Leaves punctate with pellucid dots. . Xanthoxylum, in Rutace^, 106 

 Leaves not dotted. 



Calyx present, and usually colored or petal-like. Rakukculace^, 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 (Hippuris) 1-celled. Halorage^, 180 

 Mostly woody 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. Loraxthace^, 449 

 Not parasitic above ground ; anthers on filaments. Santalace^, 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^agnace^, 448 

 Herbs, with the calyx colored like a corolla. 



Leaves opposite, simple Nyctagixace^, 425 



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



rary plainly free from the calyx, which is sometimes wanting. 

 Stipules (ocreai) sheathing the stem at the nodes. 



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



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



Stipules not sheathing the stem, or none. 

 Aquatic herbs, submerged or nearly so. 



Leaves whorled and dissected ; style single. Ceratophillace^, 488 

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

 Not aquatics, herbs. 



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



Ovary 3- (rarely 1-2) celled ; juice usually milky. Euphorbiace^, 45] 



