32 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves compound ; disk always present. 



Stamens inserted within the disk. Flowers usually polygamous. 



Petals usually 5 ; plants often scandent SAPINDACEAE. 



Petals 4; plants erect. Leaves digitate AESCULACEAE. 



Stamens inserted outside the disk. 



Fertile stamens 2 ; petals 5, 1 or 2 of them much reduced. 



SABIACEAE. 

 Fertile stamens as many as the petals, rarely fewer, but the 

 4 or 5 petals then subequal. 

 Stamens as many as the petals and opposite them; flowers 



dioecious. Leaves alternate SIMAROUBACEAE. 



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

 more or less numerous ; flowers usually perfect or 

 polygamous. 



Filaments united MELIACEAE. 



Filaments free. 



Leaves with translucent glands RUTACEAE. 



Leaves without glands BURSERACEAE. 



Series 3. GAMOPETALAE. 



Ovary inferior or semi-inferior. 

 Stamens numerous. 

 Ovary 1-celled ; plants succulent, usually armed with spines ; leaves usually 

 absent CACTACEAE. 



Ovary several-celled ; plants not succulent, unarmed ; leaves well developed. 



SYMPLOCACEAE. 

 Stamens 10 or fewer. 



Stamens twice as many as the corolla lobes. Fruit fleshy ; anthers opening 



by terminal pores; leaves alternate, simple VACCINIACEAE. 



Stamens as many as the corolla lobes or fewer. 



Stamens as many as the corolla lobes and opposite them. Corolla lobes 

 valvate in bud. 

 Plants parasitic; stigma entire; leaves opposite or verticillate, entire. 



LORANTHACEAE. 

 Plants not parasitic; stigma bilobate; leaves alternate, estipulate. 



OLACACEAE. 

 Stamens as many as the coi'olla lobes and alternate with them, or less 

 numerous. 

 Ovary 1-ovulate. 



Anthers coherent; flowers in an involucrate head. Fruit an acliene. 



ASTERACEAE. 

 Anthers not coherent ; flowers not in an involucrate head. Leaves 

 opposite. 

 Stipules present, free from the petiole. Leaves always entire. 



RUBIACEAE. 

 Stipiiles none, or if present united with the petiole. 



CAPRIFOLIACEAE. 

 0\iary containing 2 or more ovules. 



Perfect stamens fewer than the corolla lobes. Leaves simple. 



GESNERIACEAE. 

 Perfect stamens as many as the corolla lobes. 



Ovaries 2, distinct. Leaves simple, entire APOCYNACEAE. 



