WOOTON AND STANDLEY FLORA OF NEW MEXICO. 15 



Fruit not a samara. 



Fruit drupelike or berry-like; trees or shrubs. 



32. RHAMNALES (p. 412). 

 Fruit a capsule; herbs. 



22. ARISTOLOCHIALES (p. 181). 

 Stamens hypogynous, inserted under the gynoecium in the 

 perfect flower?, not on a disk in the pistillate flowers. 

 Flowers monoecious or dioecious. 



(Euphorbiaceae) 30. EUPHORBIALES (p. 392). 

 Flowers perfect. 

 Stamens tetrad ynamous. 



(Brassicaceae) 26. PAPAVERALES (p. 260). 

 Stamens not tetradynamous. 



24. CHENOPODIALES (p. 198). 

 Corolla present. 

 Petals more or less united. 

 Ovary inferior. 

 Stamens with their filaments free from the corolla. 



Stamens 10; anther sacs opening by terminal pores or chinks. 



(Vacciniaceae) 39. ERICALES (p. 486). 

 Stamens 5 or fewer; anther sacs opening by longitudinal slits. 



48. CAMPANULALES (p. 612). 

 Stamens adnate to the corolla. 

 Ovary with 1 fertile cavity. 



Flowers in involucrate heads 50. ASTERALES (p. 618). 



Flowers not in involucrate heads 49. VALERIANALES (p. 617). 



Ovary with 2 to many fertile cavities. 

 Plants tendril-bearing. 



(Cucurbitaceae) 48. CAMPANULALES (p. 612). 

 Plants not tendril-bearing. 

 Ovules mostly on basal placentae ; jjlants parasitic . 



21. SANTALALES (p. 177). 

 Ovules not on basal placentae; plants not parasitic. 



47. RUBIALES (p. 603). 

 Ovary superior. 



Stiimens free from the corolla. 



Gynoecium of a single carpel (Families of) 27. ROSALES (p. 291). 



Gynoecium of several united carpels. 



Filaments distinct (Families of) 39. ERICALES (p. 486). 



Filaments united. 



Stamens diadelphous (Fumariaceae) 26. PAPAVERALES ('p. 260). 



Stamens monadelphous. 

 Anther sacs opening by slits. 



(Oxalidaceae) 28. GERANLALES (p. 379). 

 Anther sacs opening by pores. 



Calyx and corolla very irregular 29. POLYGALALES (p. 390). 



Calyx and corolla regular. . .(Families of) 39. ERICALES (p. 486). 

 Stamens partially adnate to the corolla. 

 Stamens as many as the lobes of the corolla and opposite them, or twice as 

 many or more. 

 Ovary 1-celled. 



Placentae central or basal 40. PRIMULALES (p. 490). 



Placentae parJetaL,,,...(Fouquieriaceae) 34, HYPERICALES (p. 427). 



