Spring Flora of Oklahoma 
xii 
7a. Trees with pinnately-veined, 2-ranked leaves, 
fruit a samara, drupe or small nut. 
13. ULMACEE. 29 
7b. Trees with 2-ranked leaves having 2 prominent 
side ribs, fruit aggregate. 
14. MORACEE. 31 
7e. Trees or shrubs; leaves not 2-ranked. 
8a. Flowers with 4-5 perigynous stamens alternate 
with sepals; stigmas 2-5, fruit a drupe. 
54. RHAMNACEE. 103 
8b. Flowers with a 4-5 parted calyx, with a sim¬ 
ilar number of stamens in the staminate 
ones; sap milky. 
14. MORACEE. 31 
lb. Herbs or herbaceous vines. 
5a. Flowers partly or completely epigynous. 
6a. Low herbaceous perennials, parasitic on roots; 
flowers in umbel-like clusters; ovary 1-celled. 
16. SANTALACEE 33 
6b. Perennial herbs with axillary flowers; 4 stamens; 
capsule 4-celled. 
62, ONAGRACEE. 115 
5b. Flowers hypogynous. 
6a. Carpels 1-several, always united. 
7a. Fruit a capsule; leaves opposite or whorled, or, 
if alternate, then usually with milky or colored 
sap. 
8a. Herbs with opposite or whorled leaves with¬ 
out stipules; capsule 2-several celled. 
20. AIZOACEE. 38 
8b. Herbs with opposite, entire leaves, usually with 
swollen joints; ovary 1-celled. 
9a. Calyx of distinct sepals. 
22. ALSINACEE. 40 
9b. Calyx of united sepals. 
23. CARYOPHYLLACEE. 43 
8c. Herbs with opposite, alternate, or verticillate 
leaves and usually with milky sap; ovary 
2-3 celled. 46. EUPHORBIACEE. 89 
7b. Fruit an achene, utricle, or fleshy berry ; leaves 
alternate, opposite, or whorled; sap never 
milky. 
8a. Herbs or twining vines with swollen joints and 
sheathing stipules; fruit an achene. 
17. POLYGONACEE. 34 
8b. Stipules where present not sheathing. 
