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 gyncecium in the 

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

 Flowers monoecious or dioecious. 



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

 Flowers perfect. 

 Stamens tetradynamous. 



(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. 



(Yaceiniaceae) 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. 



Flower- 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 placenta 1 ; plants parasitic 



21. SANTALALES (p. 177). 

 Ovules not on basal placentae; plants not parasitic. 



47. RTTBIALES (p. 603). 

 Ovary superior. 



Stamens free from the corolla. 



Gyncecium of a single carpel (Families of) 27. ROSALES (p. 201). 



Gyncecium of several united carpels. 



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



Filaments united. 



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



Stamens monadelphoua. 



Anther ^aos opening by slits. 



(Oxalidaceae) 28. GERANIALES i .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 :i- tin- lodes of the corolla and opposite them, or twice as 

 rrrany or more. 

 < )v:uy L-celled. 



Placenta central or basal 40. primtjlales (p. 490). 



Placenta parietal (Fouquieriaceae) W. hypericales p 127). 



