Juncaginaceae, the Arrow Grass Family
Marsh plants, with linear cylindrical leaves and inconspicuous flowers in spikes or racemes, appearing in early summer.
| 1a. Leaves all basal; flowers numerous in a spike-like raceme (Arrow Grass) — 2. | |
| 1b. Stem-leaves present; flowers in a loose bracted raceme (1-3 dm. high). | Scheuchzeria, Scheuchzeria palustris. |
| 2a. Fruit (usually to be seen at the base of the raceme) ovoid or oblong, rounded at the base | Arrow Grass, Triglochin maritima. |
| 2b. Fruit linear, narrowed at the base (1-5 dm. high) | Arrow Grass, Triglochin palustris. |