Cicuta

1. Plant bearing numerous vegetative bulblets in the axils of broad-based, abruptly acuminate bracts, especially on upper portion of the plant; umbels very few or none; central part of leaflets (excluding teeth or lobes) less than 3 (–5) mm wide; styles becoming ca. 0.5–0.7 mm long; fruit ca. 1.5–2 mm long.

C. bulbifera

1. Plant without bulblets or acuminate bracts; umbels well developed; central part of leaflets (excluding teeth) mostly 5–25 mm wide; styles becoming ca. 1–2 mm long; fruit ca. 3–5 mm long.

C. maculata

All species found in Cicuta

Cicuta bulbiferaWATER HEMLOCK 
Cicuta maculataWATER HEMLOCK 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 30, 2017. http://michiganflora.net/genus.aspx?id=Cicuta.