THE POLYPETALOUS ORDERS. 373 



Petals numerous. Ovary many-celled. MESEMBRYANTHEMACEJE, p. 394. 



Floral envelopes symmetrical. Stamens no more than 10. 



CARYOPHYLLACE^E, p. 391. 



Floral envelopes unsymmetrical, or polyandrous. PORTULACACEJE, p. 393. 

 Petals 3-5 or 6, sometimes wanting. 



Group 8. Ovary compound and several-celled, with the placentae in the 

 axis ; or the numerous carpels more or less coherent with each other or 

 with a central axis. Calyx free from the ovary, with a valvate aestiva- 

 tion. Stamens mostly indefinite, monadelphous, or polyadelphous, in- 

 serted with the petals into the receptacle or base of the petals. 



Anthers 1-celled. Stamens monadelphous. MALVACEAE, p. 394. 



Anthers 2-celled. Fertile stam. few, monadelphous. BYTTNERIACEJE, p. 395. 

 Anthers 2-celled. Stamens polyandrous or 5-adelphous. TILIACEJE, p. 395. 



Group 9. Ovary compound, with two or more cells, and the placentae in the 

 axis, free from the calyx, which is imbricated in aestivation. Stamens 

 indefinite, or twice as many as the petals, usually monadelphous, hypo- 

 gynous. Trees or shrubs. 



Leaves simple, not dotted. Stamens indefinite. TERNSTR(EMIACE^E, p. 397. 

 Leaves pellucid-punctate, mostly compound. AURANTIACE.S, p. 397. 



Leaves compound, dotless. Stamens 10 or less, monadelphous. 



Seeds single in each cell, wingless. MELIACEJE, p. 397. 



Seeds several in each cell, winged. CEDKELACEJE, p. 398. 



Group 10. Ovary compound, or of several carpels adhering to a central axis, 

 free from the calyx, which is mostly imbricated in aestivation. Stamens 

 as many or twice as many as the petals, inserted on the receptacle, often 

 monadelphous at the base. Embryo large. Albumen little or none. 

 Flowers perfect. 



* Flower irregular and unsymmetrical. Albumen none. 

 Stamens connate. Ovules several in each cell. BALSAMINACE.S:, p. 400. 



Stamens distinct. Ovules single in each cell. TROP^EOLACEJE, p. 400. 



* * Flower regular and symmetrical throughout. 

 Leaves not glandular-dotted. 



Calyx valvate. Albumen none. LIMNANTHACE;E, p. 401. 



Calyx imbricated in aestivation. 



Embryo conduplicate : cotyledons convolute. GERANIACE^E, p. 399. 



Embryo straight or nearly so. 



Leaves entire. Fertile stamens 5. LINACEJE, p. 398. 



Leaves compound. Stamens 10. 



Styles separate. Leaves alternate. OXALIDACE.S:, p. 400. 



Styles united. Leaves opposite. ZYGOPHYLLACE^E, p. 400. 



Leaves glandular-dotted. RUTACEJE, p. 401. 



Group 11. Ovary compound, with 2 - several cells ; or one-celled by suppres- 

 sion ; or carpels distinct and barely connected by their styles. Calyx 

 free. Petals as many as the sepals, or rarely wanting. Stamens once or 

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