22 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves estipulate. 



Perianth imbricate in bud. Leaves entire or dentate, simple. 



Periantli segments 6, rarely fewer, the stamens then more nu- 

 merous than the segments but not twice as many. 

 Anthers dehiscent by recurved valves; style 1; seeds without 



endosperm. Leaves alternate, aromatic LAURACEAE. 



Anthers dehiscent by longitudinal slits ; styles 2>)r 3 ; seeds with 



endosperm. Leaves usually alternate POLYGONACEAE. 



Perianth segments 2 to 5 ; stamens as many as the segments or 

 fewer. Leaves alternate or opposite. 

 Flowers with thin chaffy bracts; filaments united, at least at 



the base AMARANTHACEAE. 



Flowers with herbaceous bracts ; filaments distinct. Leaves 



often succulent CHENOPODIACEAE. 



Perianth valvate or open in bud. Style 1 or none; stigma 1. 



Stamens inserted on the perianth. Leaves deeply lobed. alternate. 



PROTEACEAE. 

 Stamens free from the perianth. 



Filaments wholly connate ; anthers dehiscent extrorsely. Leaves 



alternate, entire MYRISTICACEAE. 



Filaments free or connate only at the base ; anthers dehiscent 

 introrsely or laterally. 

 Stamens 3 or 4, equal in number to the perianth segments 

 and opposite them. Leaves alternate ; plants often with 



stinging hairs URTICACEAE. 



Stamens more numerous or fewer than the perianth segments, 

 rarely of the same number, but the plants then with 

 opposite leaves, and the stamens 5 or alternate with the 

 perianth lobes. Leaves alternate or opposite, entire. 



AliLIONIACEAE. 

 BB. Ovules 2 or more in each cell. 

 Ovules 2 in each cell. 

 Flowers dioecious; styles 3, or the stigma sessile. 



EUPHORBIACEAE. 

 Flowers perfect or polygamous; style 1. 



Stamens 3 or 4; style terminal; leaves estipulate, alternate. 



PROTEACEAE. 

 Stamens S or more, rarely fewer, but the style then basal ; leaves 

 usually stipulate, alternate. 

 Style basal, or if terminal the stamens numerous; leav(>s simple. 



ROSACEAE. 

 Style terminal; stamens 8 or 10; leaves pinnate. 



MIMOSACEAE. 

 Ovules 3 or more in each cell. Leaves alternate. 

 Ovules attached to the ventral suture of the ovary. 



Stiunens 4, without filaments; leaves simple, estipulate. 



PROTEACEAE. 

 Stamens .5 or more, with filanu>nts; leaves compound, stipulate. 



MIMOSACEAE. 

 Ovules attached to several parietal placentae or to a basal or central 

 placenta. 

 Stamen 1. Leaves entire, estipulate; flowers spicate. 



LACISTEMACEAE. 



