EUPHORBIACEAE. 103 



racemes acute, greenish: wings oblong, sometimes broadly so, abruptly pointed: 

 capsules fully 1 mm. wide: seeds oval, about 1 mm. long. — Everglades and low 

 pinelands. — F. K. 



12. P. ramosa Ell. Plants l-o dm. tall: leaf -blades various; those of the 

 lower leaves spatulate or obovate, those of the upjjer leaves oblaneeolate to 

 linear: racemes bright j-ellow: wings acuminate: keel about 2 mm. long: 

 capsules about 1 mm. wide: seeds pubescent, about 0.5 mm. long. — Everglades. 



Order EUPHORBIALES. 



Herbs, shrubs or trees. Leaves various, sometimes reduced to scales 

 or almost wanting. Flowei's mainly monoecious or dioecious, regular. 

 Calyx of several sepals. Corolla of several petals, or often wanting. 

 Androecium of more than one stamen, except when the staminate flowers 

 are scattered over the inside of an involucre. Filaments distinct or united. 

 Anthers opening by longitudinal or transverse valves. Gynoecium 2- 

 several-carpellary or l-carjjellary, superior. Styles or stigmas usually 

 distinct and cleft, or foliaceous. Ovules 1, 2 or 3 in each cavity. Fruit 

 capsular, sometimes achene-like. 



Family 1. EUPHORBIACEAE. Spurge Family. 



Plants often with a milky sap. Leaves opposite, whorled or alter- 

 nate: blades entire, toothed, or lobed. Flowers solitary or variously 

 clustered, or much reduced and borne in an involucre. Fniit usually de- 

 pressed or slightly elongate. 



Flowers not in an involucre : calyx of several sepals. 

 Ovules and seeds 2 in each cavity. 



Monoecious or rarely dioecious : ovary .S-celled : fruit capsular or baccate. 

 Androecium and gynoecium surrounded by a disk at the base. 



Anthers opening horizontally: fruits capsular. 1. I'hyllanthcs. 

 Anthers opening vertically : fruits baccate. -. Cicca. 



Androecium and gynoecium not surrounded by a 



disk at the base. ?•. Breyxia. 



Dioecious: ovary 1- or 2-celled : fruit drupaceous. 4. Drypetes. 



Ovules and seeds solitary in each cavity. 



Flowers either staminate or pistillate or both in more 

 or less elongated spikes or racemes (pistillate 

 basal). 

 Corolla present in either staminate or pistillate flow- 

 ers or in both (except in Croton punctatus). 

 Stamens 5-6 : filaments distinct. 5. Crotox. 



Stamens 10 : filaments monadelphous. 



Styles 2-cleft : petals distinct. 6. Ditaxis. 



Styles several-cleft : petals united at the base. 7. Caperoxia. 

 Corolla wanting. 



Styles 2-3 : ovary 2-3-celled. 



Stamens numerous, 8-20, rarely few in some 



flowers. 8. Ac.\lypha. 



Stamens 1-5. 



Pistillate flowers and capsules pedicelled. 



Calyx manifest. 9. Tragia. 



Calyx obsolete or rudimentary. 10. Gymxaxthes. 



Pistillate flowers and capsules sessile. 11. Stillixgia. 

 Styles 6-8: ovary 6-8-celled. 12. TIippomaxe. 



Flowers either staminate or pistillate, or both, in cymes 

 or short racemes. 

 Leaf-blades peltate. 13. Ricixt'S. 



Leaf-blades not peltate. 



Flowers in forking cymes. 



Stamens 10 or more : petals wanting. 14. Cxidoscolus. 



