Tennessee › Euphorbiaceae

Ouachita Spurge

Euphorbia ouachitana

Also known as

Mayfields Spurge

Listed in Tennessee’s rare-plant reference. Use nursery-propagated plants; conservation status is separate from this ecological score.

Strong

Tennessee · provisional Quercus Score

Calculated with the same rules as North Carolina, using Tennessee host-range and conservation-rank inputs. Native-status evidence is shown separately.

Tennessee scoring method and limits

Insect resources, birds and habitat

Caterpillars	8 recorded species on the genus Host genera of native Lepidoptera recorded in Tennessee; host association and range overlap, not confirmed local feeding.
Bees	13 recorded species on the genus Southeastern North America
Specialist bees	0 recorded species on the genus Eastern North America
Birds	14 recorded species on the genus North America
Structure	Forb/herb

Baseline 59; additional insect credit +0. Rarity adjustment -8 using the NC rule (unranked: −5; final score floor: 5). Missing records do not establish zero ecological use.

Native to Tennessee (state-specific source). Tennessee yard-fit calculations are not available yet.

Recorded in your county?

Tennessee county

Choose a county to check the available records.

County occurrence is not proof of native range or yard suitability. A missing record does not establish absence.

Tennessee status	Native to Tennessee (state-specific source)
Source conservation rank	S2
Recorded in Tennessee	2 counties in the atlas snapshot

Growing conditions

No reviewed growing-condition notes are attached yet.

Native-status evidence

Combined TN–KY atlas flag: Y. A regional flag alone does not settle Tennessee native status.

Combined-source assessment

Native to Tennessee (state-specific source)

A TN-specific UT native-guide page or an exact entry in the Tennessee rare-plant list supports a direct source claim. Otherwise, TN occurrence plus an atlas native flag and exact-name native evidence from NC flora or USDA L48 supports a provisional state inference. No one regional claim or occurrence alone establishes TN nativity; NC and L48 claims retain their actual scopes.

Tennessee Natural Heritage rare-plant list (2025): native (TN). Euphorbia ouachitana Ozark spurge OPEN FORESTS FL:APR-MAY S S2 G3 Eurybia saxicastellii Rockcastle Aster ROCKY RIVER BARS FL: AUG-OCT, FR: AUG-OCT CU E S1S2 G3 Eurybia schreberi Schreber's Aster MESIC WOODS & SEEPAGE SLOPES FL: AUG-OCT, FR: SEPT-NOV ER, RV, CM, BR, CU S S1 G4 Euthamia gymnospermoides Great Plains Goldentop PRAIRIES AND BARRENS FL: AUG-SEP, FR: SEP-OCT ER, WR E S1 G5 Evolvu

TN–KY Plant Atlas: native (TN–KY).

Sources

Machine-readable: plant evidence.

Quercus Score v0.6.4 · built 2026-09-26 · Tennessee beta · sources and limitations on every page