Vascular Plants of North Carolina
Account for Slender Threeseed Mercury - Acalypha gracilens   A. Gray
Members of Euphorbiaceae:
Members of Acalypha with account distribution info or public map:
Google Images
Section 6 » Order Euphorbiales » Family Euphorbiaceae
Show/Hide Synonym
AuthorA. Gray
DistributionNearly throughout the state, but scarce in the Mountains and northwestern Piedmont.

ME to WI, south to FL and TX.
AbundanceFrequent to common in the Coastal Plain and most of the Piedmont; fairly common at best in the western Piedmont, and rare in the southern Mountains. Frequently encountered, but populations are usually not large.
HabitatWoodland openings and edges, glades, fields, clearcuts, roadsides, powerlines, waste lots.
PhenologyFlowering and fruiting late June-October.
IdentificationUnlike most of our "Euphorbs", copperleafs and threeseed mercuries have colorless, not white and milky, stem juice. Slender Threeseed Mercury grows only 1-2 feet tall, and has generally dense but very short and appressed hairs on the stem and branches (vs. spreading hairs and long leafstalks in Virginia Threeseed Mercury [A. virginica]). It has narrowly elliptical to lanceolate leaves that taper to the base. It differs from Common Threeseed Mercury (A. rhomboidea) by the shorter leafstalks and shorter teeth on the inflorescence involucres (leafy "bracts" that envelope the flowers). This is a rather easily found species in the eastern and central parts of the state, but most Acalypha species are passed over, as they have tiny flowers and are not tall or robust species.
Taxonomic CommentsNone

Other Common Name(s)Shortstalk Copperleaf
State RankS5
Global RankG5
State Status
US Status
USACE-agcpFAC link
USACE-empFAC link
County Map - click on a county to view source of record.
Photo Gallery
B.A. SorriePiedmont, Robbins, roadside, Bear Creek Trails, Sept 2021. MoorePhoto_natural
Select a source
Select an occurrence type