ARTIFICIAL KEY TO THE NATURAL ORDERS. 



XIX 



PASSIFLORACE.E, 138 

 SAXIFRAGACE.E, 141 



PAPAVERACE33, 24 

 CAPPARIDACE^E, 40 



PARNASSIACILE, 48 



DROSERACE^E, 47 

 CISTACE^S, 45 



Leaves with stipules. Seeds single or few, destitute of albumen. ROSACE^E, 110 



Leaves destitute of stipules. Seeds with albumen. 



Pistils 2, fewer than the (5, or rarely 4) petals. SAXIFRAGACE^l, 142 



Pistils 3-5, of thft same number as the petals. CRASSULACEJS, 139 



Stamens connected with the stigma, which unites the tops of 2 pistils. ASCLEPIADACE^E, 360 



i- -t- Pistil one, compound ; the ovary \-celled, 



Corolla irregular, of 4 petals. Stamens 6, collected in two sets. FUMARIACE^l, 26 



Corolla irregular, of 5 petals. Stamens 5 ; their broad anthers united. VIOLACE^E, 41 



Corolla regular : ovule solitary from the base. Leaves alternate. ANARCARDIACEJE, 76 



Corolla regular : ovules from the base or axis. Leaves opposite. CARYOPIIYLLACE^l, 53 



Corolla regular : ovules few or many on 2 - several parietal placentae. 



Stamens monadelphous, their tube sheathing the stalk of the ovary. 



Stamens separate, inserted on the- calyx. 



Stamens separate, inserted on the receptacle. 



Sepals 2, caducous. Juice milky or colored. 



Sepals 4, deciduous. Style 1. Juice not milky. 



Sepals 5. or sometimes 3, penitent. 



A cluster of sterile filaments placed before each petal. 



Sterile filaments or appendages none. 



Styles 6 or 10, double the number of the placentae. 



Style 1 or none : stigmas 1 - 3 : placeutae 3. 



H- -- -i- Pistil one, compound ; the ovary 2 - IQ-celled. 



+ Flowers irregular. 



fctamens 6 or 8 in two sets, connected with the petals : anthers 1-celled. POLYGALACE^E, 85 

 Stamens 10, distinct, free from the petals : anthers 2-celled. Rhodora in ERICACEAE, 245 



Stamens 6-8, distinct, free from the petals : anthers 2-celled. SAPINDACEJE, 82 



Stamens 5 : anthers conniving over the stigma, 2-celled. . BALSAMINACEJE, 73 



M- -H- Flowers regular or nearly so. 



Stamens (mostly 2) fewer than the 4 petals. OLEACE^E, 356 



Stamens more numerous than the petals, but not twice as many. 



Of equal length. Corolla not cruciform. ACERINE^I, 84 



Two stamens shorter than the 4 others. Corolla (of 4 petals) cruciform. CRUCIFER^S, 28 

 gtamens just as many or twice as many as the petals. 

 Ovules and seeds only 1 or 2 in each cell. 

 Herbs. Flowers monoecious. Styles fewer than the sepals. 

 Herbs. Styles or stigmas as many as the petals or sepals. 

 Sepals, petals, and lobes of the ovary 3. Stamens 6. 

 Sepals and petals 5. Ovary and pod 10-celled. 

 Sepals, petals, and cells of the ovary 5. Stamens 10 or 5. 

 Shrubs or trees. 



Fruit a fleshy colored pod. Seeds enclosed in a pulpy aril. 

 Fruit 2-winged. Leaves opposite. Aril none. 

 Fruit a 4 - 8-seeded drupe. Leaves alternate. 

 Ovules (and usually seeds) several or many in each cell. 

 Stipules between the opposite and simple leaves. 

 Stipules between the opposite and compound leaves. 

 Stipules none when the leaves are opposite. 

 Stamens 5, monadelphous in a 10-toothed tube or cup. 

 Stamens 10, monadelphous at tho base. 

 Stamens distinct, free from the calyx. 

 Style 1, undivided 

 Styles 2-5, separate 

 Stamens distinct, inserted on the calyx. 

 Styl* 1. Pod enclosed in the calyx becoming 1-celled. 

 Styles 2 (rarely 3), or splitting into 2 in fruit. 



EUPHORBlACE^l, 385 



LIMNANTHACE^J, 74 



LINACEJS, 70 



GERANIACEJE, 72 



CELASTRACE.E, 81 



ACERINEJB, 84 



AQUIFOLIACE2E, 263 



ELATINACEJE, 52 

 STAPHYLEACILSl, 82 



GALACINE^!, 262 

 OXALIDACE^I, 71 



ERICACEAE, 245 

 CARYOPHYLLACKE, 62 



LYTHRACE^E, 127 

 SAX1FRAGAC&E, 141 



