Portulacaceae, the Purslane Family
Herbs with opposite or alternate leaves and regular flowers with 2 sepals, 5 petals, and a 1-celled ovary with 2 or 3 styles.
| 1a. Leaves a single pair on each stem (1-2 dm. high; flowers pink, in racemes in early spring) (Spring Beauty) — 2. | |
| 1b. Leaves numerous (prostrate or spreading; flowers in summer) — 3. | |
| 2a. Leaves lance-ovate to oblong, not more than six times as long as wide | Spring Beauty, Claytonia caroliniana. |
| 2b. Leaves linear or linear-lanceolate, more than six times as long as wide | Spring Beauty, Claytonia virginica. |
| 3a. Flowers yellow, about 5 mm. wide | Purslane, Portulaca oleracea. |
| 3b. Flowers 2-5 cm. wide | Portulaca, Portulaca grandiflora. |