24 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Plants small shrubs, oiten parasitic; fruit not winded. 



Leaves opposite or verticillate, sometimes reduceil l<> scales; 



plants parasitic LORANTHACEAE. 



Leaves mostly alternate ; plants not parasitic. 



CHENOPODIACEAE. 

 Ovules 2 or more. 



Ovules 2 to 4. Leaves alternate, simple COMBRETACEAE. 



Ovules 6 or more. 



Plants erect trees; fruit an acorn; tlowers in catkins FAGACEAE. 



Plants scandent shrubs; fruit not an acorn; flowers not in catkins. 



ARISTOLOCHIACEAE. 

 Ovary completely several-celled. 



Ovule 1 in each cell ; leaves simple, stipulate. 



Ovary cells and styles or stigmas 3 or 4. Leaves opposite or alternate. 



entire or dentate RHAMNACEAE. 



Ovary cells and styles or stigmas 2. I^eaves entire, opposite. 



RUBIACEAE. 

 Ovules 2 or more in each cell ; leaves simple, estipulate. 



Plants scandent; perianth 3-lobed or 1 or 2-lipped ; leaves alternate. 



ARISTOLOCHIACEAE. 

 Plants erect ; perianth 4 to 8-lobed or parted ; leaves opposite or alternate. 



MYRTACEAE. 



Series 2. POLYPETALAE. 



A. Ovary wholly or half inferior. 

 B. Perfect stamens 10 or fewer. 

 Ovule 1 in each cell of the ovary. 



Stamens as many as the petals and opposite them. 



Ovary l-cellcd ; plants parasitic. Leaves opposite or verticillate. (Mitire. 



LORANTHACEAE. 

 Ovary 2 to 4-celled ; plants not parasitic. Leaves opposite or alternate, 



entire or dentate RHAMNACEAE. 



Stamens as many as the petals and alternate with them, or fewer or 

 more numerous. 

 Style 1, simple or cleft only at the apex, or the stigma 1 an<l sessile. 

 Fruit an achene. Flowers in dense globose heads : leaves alternate. 



usually lobate PLATANACEAE. 



Fruit not an achene. Leaves alternate or opposite. 



Petals contorted in bud. Leaves simple, entire or dentate. 



ONAGRACEAE. 

 Petals valvate in bud. 



Leaves entire; flowers not in umbels CORNACEAE. 



Leaves lobed or compound; flowers in unib(4s__ARALIACEAE. 

 Styles 2 or more, free or connected only at the base, or the stigmas 2 

 or more and sessile. Leaves alternate. 

 Ovary half inlferior ; fruit capsular; flowers in globose heads 



Leaves palmately lobed— HAMAMELIDACEAE. 



Ovary wholly inferior; fruit baccate; flowers in umbels. 



ARALIACEAE. 

 Ovules 2 or more in each cell of the ovary. 

 Styles 2 or more, united only at the base. 



Leaves alternate FLACOURTIACEAIk 



Leaves opposite HYDRANGEACEAE. 



