XXViii ANALYTICAL KEY. 



Ovary wholly inferior in perfect or pistillate flowers. 



Aquatic herbs : ovary 3-4-celled, or (Hippuris) I-eelled. 129 Halorage2E. 

 Woody plants : style or stigma one, entire : ovary 1 -celled. 



Stigma running down one side of the style. Nyssa, 1G0 Cornace.e. 



Stigma terminal, with or without a style. 

 Parasitic on the branches of trees : anthers sessile. 382 Lorantmace.e. 

 Not parasitic above ground : anthers on filaments. 381 Santalace^e. 

 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. 380 El.eagnace.e. 



Herbs : calyx colored like a corolla. 



Leaves opposite, simple 360 (74) Nyctaginace.e. 



Leaves alternate, pinnate Sanguisorba, 110, Rosacea. 



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

 Stipules (ochrete) sheathing the stem at the nodes. 



Tree : calyx none : flowers monoecious, in heads. -100 Plataxace.e. 



Herbs: calyx present and often colored. . 371 (75) Polygonace,e. 

 Stipules not sheathing the stem, or none. 

 Aquatic herbs, submersed or nearly so. 



Leaves whorled-dissected : style 1. . . 383 Ceratophyllace^:. 

 Leaves opposite, entire : styles 2 : ovary 4-celled. 384 CallitrichacejE. 

 Not aquatics, herbs. 



Ovary 10-celled : berry 10-seeded. . . 361 Phytolaccace.e. 



Ovary 3-celled, rarely 1 - 2-celled : juice milky. 385 (76) Euphorbiace*:. 

 Ovary one-celled : juice not milky. 

 Style, if any, and stigma only one : leaves simple : 



no scarious bracts around the flowers. . . 394 Urtice^e. 



Style or stigmas 2 or 3 : embryo coiled or curved. 

 Stipules not scarious : leaves palmatcly cleft 



or palmately compound. . . 395 (76) Cannabine*:. 



Stipules scarious 54 Illecebre.e. 



Stipules and scarious bracts none : stamens 



inserted high up on the tube of the calyx. 54 Sclerantue^;. 

 Stipules none : but scarious bracts crowded 



around the flowers. . . . 367 (75) Amarantace.e. 



Stipules and scarious bracts none. 361 (74) CHENOPODiACEyE. 



Shrubs or trees. 



Ovules a pair in each cell of the ovary. 

 Fruit a 3-celled pod : leaves evergreen. Buxus, (76) Euphorbiace^e. 



Fruit 2-celled, a double samara 82 Acerine.e. 



Fruit a 1-celled 1-seeded samara or drupe. . 356 (73) OleacejE. 

 Ovules single in each cell of the 



Three -9-celled ovary : leaves small and heath-like. 393 Empetracea 

 Three-celled ovary : leaves broad. . . • "8 Rhamnace^e. 



