Best Recognition Features:

1. twigs with unbranched thorns
2. variably-shaped leaves, serrate margins
3. wet sites

NOTES:
Crataegus marshallii (parsley hawthorn): Facultative (FAC): Occurs in wetlands or non-wetlands of the Atlantic and Gulf Coast Plain Region

Crataegus opaca (mayhaw): Obligate Wetland (OBL): Almost always occurs in wetlands of the Atlantic and Gulf Coast Plain Region