88 VASCULAR PLANTS. 



Ovary 2-locular, 2-lobed; loculi 2-ovulate. 

 Fruit a 2-seeded samara. 



\ . leaves opposite, palrnately lobed, decid- 

 uous. 



3. Negundo, Moench. 



Polygamous. Petals 0. 6 : stamens 4, some- 

 times 5, opposite to the calyx teeth. ? : ovary 

 2-locular, 2-lobed; loculi 2-ovulate. Fruit a 

 2-seeded samara. 



*? . leaves opposite, imparipinnate, decidu- 

 ous. 



ORDER XVIII. CELASTRALES. 



Parts of the flower correspondent in number. 

 Disk tumid, adnate to the base of the calyx. 

 Stamens inserted with the petals on the margin 

 of the disk. Ovules definite. 



Family LV. Rhamnacese. 



Calyx conspicuous, gamosepalous, valvate in 

 aestivation. Stamens inserted with the petals, 

 and alternate with the calyx-lobes. Ovary 

 3 — 2-locular; loculi 1-ovulate; styles 3 — 2, more 

 or less connate. 



1. Rhamnus, Juss. 



Calyx-tube urceolate, margin 5 — 4-cleft. Pet- 

 als emarginate, or wanting. Ovary free. Fruit 

 a 3 — 2-pyrenous drupe. 



\ • leaves alternate, stipulate.* 



