Parthenium integrifolium Linnaeus var. mabryanum Mears. Section: Partheniastrum. Sandhill Wild Quinine, Mabry's Wild Quinine, Carolina Wild Quinine. Phen: Late May-Nov (blooming strongly in response to fire). Hab: Longleaf pine sandhills, Piedmont oak-pine woodlands, and other sunny situations in dry soils (roadsides). Dist: Nc. SC, e. NC, and se. VA, extending into the e. Piedmont of NC in dry sandy soils around granitic flatrocks or in (formerly) fire-maintained pine, oak-pine, and oak woodlands.

Origin/Endemic status: Endemic

Taxonomy Comments: Var. mabryanum is the characteristic variety of P. integrifolium in the Sandhills of NC. Mears also named a new species, P. radfordii Mears, to accommodate sinuate-lobed Parthenium from the fall-line sandhills of NC and SC, which he also believed to be later-blooming (Aug-Nov) than other Parthenium. Extensive observations in the Sandhills of NC show that "P. radfordii" consistently co-occurs in mixed populations with P. integrifolium var. mabryanum, and that flowering is triggered by fire. These sinuate-lobed plants are best considered a form of var. mabryanum.

Synonymy ⓘ: = K1, Va; < Parthenium integrifolium L. – C, F, FNA21, G, K3, K4, S, SE1, W, Rollins (1950); < Parthenium integrifolium L. var. integrifolium – RAB; > Parthenium integrifolium L. var. mabryanum Mears – Mears (1975); > Parthenium radfordii Mears – Mears (1975)

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Heliophily ⓘ: 8