WOOTON AND STANDLEY FLORA OP NEW MEXICO. 17 



Ovary superior. 

 Stamens inserted on the margin of a disk or hypanthiiim (perigynous or hypo- 

 gynous). 

 Stamens as many as the petals and opposite them. 

 Styles and upper part of the ovaries distinct; ovules and seeds many. 



(Saxifragaceae) 27. ROSALES (p. 291). 

 Styles united; ovules and seeds solitary or 2. .32. RHAMNALES (p. 412). 

 Stamens as many as the petals and alternate with them or more. 



Styles distinct (Saxifragaceae) 27. ROSALES (p. 291). 



Styles united. 



Hypanthium cup-shaped or campanulate; disk obsolete or incon- 

 spicuous 37. MYRTALES (p. 459). 



Hypanthium flat or obsolete; disk fleshy. 

 Plants with secreting glands in the bark. 



(Rutaceae) 28. GERANIALES (p. 379). 

 Plants without secreting glands in the bark. 



31. SAPINDALES (p. 405). 

 Stamens inserted at the base of the ovary or receptacle. 

 Stamens numerous. 



Sepals valvate; filaments united 33. MAL VALES (p. 416). 



Sepals imbricated ; filaments various 26. PAPAVERALES (p. 260). 



Stamens few, not over twice as many as the petals. 

 Stamens as many as the petals and opposite them. 

 Anther sacs opening by hinged valves. 



(Berberidaceae) 26. RANALES (p. 243). 

 Anther sacs opening by slits. 



Flowers monoecious 30. EUPHORBIALES (p. 392). 



Flowers perfect. 



Ovules and seeds several or many; embryo coiled. 



(Portulacaceae) 24. CHENOPODIALES (p. 198). 

 Ovules and seeds solitary; embryo straight. 



(Plumbaginaceae) 40. PRIMULALES (p. 490). 

 Stamens as many as the petals and alternate with them or more, some- 

 times twice as many. 

 Stamens 6; petals 4; sepals 2 or 4. 



(Families of) 26. PAPAVERALES (p. 260). 

 Stamens, petals, and sepals of the same number, or stamens more than 

 the sepals or petals, then usually twice as many. 

 Ovary 1-celled. 

 Ovules and seeds on basal or central placenta?. 



(Families of) 24. CHENOPODIALES (p. 198). 

 Ovules^'and seeds on parietal placentte. 



Stamens with united filaments (no staminodia). 



33. MAL VALES (p. 416). 

 Stamens with distinct filaments. 



Staminodia present. (Pamassiaceae) 27. ROSALES (p. 291). 

 Staminodia wanting. 



(Families of) 34. HYPERICALES (p. 427). 

 Ovary several-celled. 

 Stamens adnate to the gynoecium. 



(Asclepiadaceae) 44. ASCLEPIADALES (p. 503). 

 Stamens not adnate to the gynoecium. 

 Filaments wholly or partly united. 

 Anthers opening by long slits. 



(Families of) 28. GERANIALES (p. 379). 

 52576°— 15 2 



