Podostemaceae, the River Weed Family
Small submerged aquatics, growing attached to stones in running water, with dissected leaves and minute flowers.
One species in Michigan River Weed, Podostemum ceratophyllum.
Crassulaceae, the Orpine Family
Herbs, with usually alternate leaves; the sepals, petals, and pistils each 4 or 5, or in one species the petals none, and the stamens as many or twice as many as the sepals.
| 1a. Leaves entire (Stonecrop) — 2. | |
| 1b. Leaves toothed — 3. | |
| 2a. Leaves 3-5 mm. long, very thick and fleshy (tufted plants about 1 dm. high, with yellow flowers in summer) | Stonecrop, Sedum acre. |
| 2b. Leaves 10-30 mm. long, flat (tufted plants 1-2 dm. high; flowers white, in spring) | Stonecrop, Sedum ternatum. |
| 3a. Petals present, purple (2-5 dm. high; summer) | Live-for-ever, Sedum purpureum. |
| 3b. Petals none (3-6 dm. high; summer) | Ditch Stonecrop, Penthorum sedoides. |