GROUPS AND ORDERS, 359 



*** Ovary inferior ; (stamens epigynous) . 



11. Umbelliferous plants herbs ; fruit dry, of two carpels, se- 



parating from the axis. 



12. Araliaceous plants shrubs ; fruit succulent, of more than 



two carpels, not separating. 



Monopetals : Dichlamydeous plants, with the petals united 

 (from the base more or less upwards) into a single piece; 

 Orders 13 to 18. 



* Stamens epigynous ; (ovary inferior). 

 t Stamens attached to the corolla, separate. 



13. Dipsacaceous plants herbs; flowers in compact heads or 



spikes; calyx surrounded by an involucre; stamens equal- 

 ling in number the divisions of the corolla, the anthers free. 



ft Stamens attached to the corolla, cohering by their anthers. 



14. Composite plants herbs ; florets in heads ; stamens equalling 



in number the divisions of the corolla, the anthers united 

 into a ring around the style. 



** Stamens hypogynous. 



15. Ericaceous plants shrubs ; stamens as many or twice as 



many as the corolla lobes ; anthers opening by two pores. 



** Stamens perigy nous. 

 t Seeds attached to a free central placenta. 



16. Primulaceous plants herbs ; stamens attached to the tube 



of the corolla, isomerous, opposite its lobes. 



ff Seeds attached to a parietal placenta. 

 J Corolla regular. 



17. Gentianaceous plants herbs; stamens attached to the 



tube of the corolla, isomerous, alternating with its lobes. 



