Gratiola

1. Leaves with conspicuous dark glandular dots on both surfaces; corolla bright yellow; capsule at most scarcely 3 mm long.

G. aurea

1. Leaves with glandular dots obscure or none; corolla yellowish, cream, or white; capsules 3–7 mm long.

2. Pedicels at maturity at least twice as long as the calyx.

G. neglecta

2. Pedicels at most ca. 1.5 times as long as the calyx.

G. virginiana

All species found in Gratiola

Gratiola aureaGOLDEN HEDGE-HYSSOP; GOLDENPERT 
Gratiola neglectaCLAMMY HEDGE HYSSOP 
Gratiola virginianaROUND-FRUITED HEDGE HYSSOP 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 22, 2017. http://michiganflora.net/genus.aspx?id=Gratiola.