DIALYFETALOUS EXOGENOUS PLANTS. XCr'l 



Vernation straigJit. Petals usually caducous. CISTACEAK. p. 26. 



GROUP 5. Ovary compound with the placentae parietal, or 2- 5- 

 celled from their meeting in the axis. Stamens hypogynous. 

 Embryo straight, with little or no albumen. 



Stipules none ; leaves dotted. Stamens in parcels. HYPERICACEAE. p. 28. 



GROUP 6. Ovary compound, 1-celled with a free central placenta, 

 or 2- several-celled with the placenta in the axis. Calyx free or 

 nearly so. Embryo peripheric, on mealy albumen. 



Floral envelopes symmetrical. CARYOPHVLLACEAE. p. 30. 

 Floral envelopes unsymmetrical. PORTULACACEAE. p. 34. 



GROUP 7. 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 aestivation. 



Anthers l-cdled. Stamens monaddphous. MALVACEAE, p. 35. 



Anthers 2-celled. Polyandrous or 5-adelphous. TILIACEAE. p. 37. 



GROUP 8. Ovary compound, or of several carpels adhering to a 



central axis, free from the calyx, which is mostly imbricated in 



aestivation. Flowers perfect. 



f Flower irregular and unsymmetrical. 



Stamens connate. Ovules several in each cell. BALSAMINACEAK. p. 40. 

 Stamens distinct. Ovules single in each cell. TROPAEOLACEAE. p. 41. 



f f Flower regular and symmetrical throughout. 

 Calyx valvate in aestivation. LIMNANTHACEAE. p. 42. 



Calyx imbricated in aestivation. 



Embryo conduplicate. GERANIACEAE. p. 39. 



Leaves simple. Stamens 5. LINACEAE. p. 38. 



Leaves compound. Stamens 10. OXALIDACEAE. p. 40. 



GROUP 9. Ovary compound, with 2 or several cells, or 1-celled by 

 suppression, or carpels distinct and barely connected by their 

 styles. Calyx free. Petals as many as the sepals, or rarely want- 

 ing. Stamens once or twice as many as the sepals, distinct. Eiti- 

 bryo large ; albumen little or none. Flowers polygamo-dioicous. 



Leaves dotted. Ovaries or cells 2-ovuled. XANTHOXYLACEAE. p. 42. 

 Leaves dolless. Ovary 1 ; ovule long-pedicelled. ANACARDIACEAE. p. 43. 



GROUP 10. Ovary compound, 2- 3-lobed, 2- 3- celled, free from the 

 calyx, which is imbricated in the bud. Petals often irregular, or 1 

 fewer than the sepals or sometimes wanting. Stamens definite, 

 distinct, inserted on or around a hypogynous disk. Ovules 1 or 2 

 in each cell. Embryo curved or coiled; albumen none. Flowers 

 often polygamous. 



Leaves opposite. Gynaecium dimerous. ACERACEAE. p. 44. 



Leaves chiefly alternate. Gynaecium trimerous. SAPIWDACEAE. p. 47. 



I 



