ONAGRACEAE. 



241 



4-celled ; styles united ; stigma capitate, discoid or 4-lobed ; 

 ovules many in each cell. Fruit usually a capsule. 

 Seeds mostly small, sometimes with a coma; endosperm 

 scanty or none; embryo straight. 



Calyx-tube not produced above the ovary, its 



lobes persistent. 1. JussiAEA. 



Calyx-tube usually produced above the ovary, 

 the free portion and lobes deciduous. 

 Seeds comose. 



Flowers showy, scarlet. 2. Zauschneria. 



Flowers small, white or purplish. 3. Epilobium. 



Seeds naked. 



Anthers attached at or near the base and 

 remaining erect. 

 Flowers minute; calyx-lobes erect. 4. Boisduvalia. 

 Flowers showy; calyx-lobes erect or 

 united at the tip and turned to 

 one side in anthesis. 

 Petals distinctly clawed. 5. Clarkia. 



Petals sessile. 6. Godetia. 



Anthers attached in the middle and ver- 

 satile. 

 Capsule 4-celled. 



Stigma 4-lobed; calyx-tube much 

 exceeding the capsule. 

 Flowers yellow; seeds angled, 



in 2 rows. ^ 7. Oenothera. 



Flowers white or pink; seeds 



not angled, in 1 row. 8. Anogra. 



Stigma capitate. 



Calyx-tube with a lobed disk 



at the throat. 9. Eulobus. 



Calyx-tube naked at the 

 throat. 10. 



Capsule 2-celled; flowers minute. 11. 



Sphaerostigma. 

 Gayophytum. 



1. JUSSIAEA L. 



Perennial herbs with alternate, usually entire leaves, 

 and white or yellow axillary solitary flowers. Peduncles 

 mostly 2-bracted at the summit. Calyx-tube elongated, 

 cylindric or prismatic, adnate to the ovary but not pro- 

 longed beyond it, the limb 4-6-lobed, the lobes acute, 

 persistent. Petals 4-6, rarely more, inserted under the 

 margin of the disk. Stamens 8-12 in 2 rows, inserted 

 with the petals; filaments short. Ovary 4-6-celled; 

 stigma 4-6-lobed ; ovules many. Capsule linear, oblong 

 or club-shaped, angular or ribbed, septicidally dehiscent. 

 Seeds numerous. 



17 



