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. Penthorum, in CRASSULACE^E, 176 

 Three-celled and 3-valved, or 3 - 5-celled and circumscissile. FICOIDE.E, 198 

 Two-celled or one-celled ; placentae central. 



Stamens inserted on the throat or tube of the calyx. LYTHRACE.E, 18* 

 Stamens inserted 01 the receptacle or the base of the calyx, 

 Alternate with the 5 sepals. . . . Glaux, in PRIMTJLACE^E, 331 

 Opposite the sepals when of the same number. CARYOPHYLLACE^E, 82 

 One-celled, with one parietal placenta. ) EANUNCULACE^, 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. . . ROSACE/E, 150 

 Stamens inserted on the receptacle. 



Leaves punctate with pellucid dots. . Xanthoxylum, in RUTACE^E, 106 

 Leaves not dotted. 



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

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



* # Pistil one t either simple or compound. 



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



2-celled; styles 2; stamens many. . . HAMAMELIDE.E, 179 

 Ovary wholly inferior (in perfect or pistillate flowers). 



Aquatic herbs ; ovary 3 - 4-celled, or (Hippuris) 1-celled. HALORAGE^E, 180 

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



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

 Stigma terminal, with or without a style. 



Parasitic on the branches of trees ; anthers sessile. LORANTHACE.E, 449 

 Not parasitic above ground ; anthers on filaments. SANTALACE^E, 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^E, 448 

 Herbs, with the calyx colored like a corolla. 



Leaves opposite, simple NYCTAGINACE^E, 425 



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

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

 Stipules (ocreae) sheathing the stem at the nodes. 



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



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



Stipules not sheathing the stem, or none. 

 Aquatic herbs, submerged or nearly so. 



Leaves whorled and dissected ; style single. CERATOPHYLLACEJE, 488 

 Leaves opposite, entire; styles 2; ovary 4-celled* HALORAGE.E, 180 

 Not aquatics, herbs. 



Ovary 10-celled; berry 10-seeded. . . PHYTOLACCACEJE, 435 

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



