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 gynecium in the 
perfect flowers, not on a disk in the pistillate flowers. 
Flowers moneecious or dicecious. 
(Euphorbiaceue) 30. EDUPHORBIALES (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. 
(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 placente; plants parasitic. 
21. SANTALALES (p. 177). 
Ovules not on basal placente; plants not parasitic. 
47, RUBIALES (p. 603). 
Ovary superior. 
Stamens free from the corolla. 
Gyneecium of a single carpel.........- (Families of) 27. ROSALES (p. 291). 
Gyneecium of several united carpels. 
Filaments distinct.............-.-- (Families of) 39. ERICALES (p. 486). 
Filaments united. 
Stamens diadelphous...... (Fumariuceae) 26. PAPAVERALES (p. 260). 
Stamens monadelphous. 
Anther sacs opening by slits. 
(Oxalidaceae) 28. GERANIALES (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. 
Placentx central or basal.............-.-. 40. PRIMULALES (p. 490). 
Placente parietal......- (Fouquieriaceae) 34, HYPERICALES (p. 427). 
