Nyctaginaceae, the Four-o’Clock Family
Herbs, with opposite entire leaves and flowers in small clusters surrounded by a broad open calyx-like involucre; the true calyx colored like a corolla; petals none (4-8 dm. high; flowers purple, in summer).
| 1a. Leaves lanceolate or narrower, sessile | Umbrella-wort, Oxybaphus hirsutus. |
| 1b. Leaves ovate, petioled | Umbrella-wort, Oxybaphus nyctagineus. |