Aquatic and Wetland Vascular Plants of the Northern Great Plains
Agalinis Raf. -- Gerardia
Shallowly fibrous-rooted annuals, often hemiparasitic; foliage dark green and tending to blacken upon drying; stems slender, erect, branched, 4-angled. Leaves opposite or subopposite, sessile, often with fascicles of smaller leaves in the axils, linear to linear-lanceolate, sparingly to conspicuously scabrous on the upper surface. Flowers solitary from the axils of upper leaves, on slender pedicels; calyx nearly regular, 5-lobed, campanulate in flower to hemispheric in fruit, somewhat accrescent, lobes broadly triangular at the base with an acuminate tip; corolla 5-lobed and weakly bilabiate, reddish to pinkish-purple, obliquely campanulate, the lobes shorter than the tubular portion, finely fringed with cilia; stamens 4, the lower pair longer; style simple. Capsule globose or nearly so, surpassing the calyx; seeds numerous, dark brown to blackish, triangular to trapezoidal, reticulate.
| Lead | Characteristic | Go To |
| 1 | Pedicels 2-5 mm long, shorter than to as long as the calyx; corolla (17)20-32 mm long. | A. purpurea |
| 1 | Pedicels 8-20 mm long, longer than the calyx; corolla 8-15 mm long. | A. tenuifolia |
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