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Portulaca coronata Small. Flatrock Portulaca. Phen: Jun-Sep. Hab: On or around granitic flatrocks, usually under Juniperus virginiana, and on Altamaha Grit outcrops. Dist: SC south to GA, endemic to granitic and sandstone outcrops in the Piedmont and rarely Altamaha grit (sandstone outcrops in the upper Coastal Plain).

Origin/Endemic status: Endemic

Taxonomy Comments: Matthews & Levins (1985) include this taxon in P. umbraticola. Later, Matthews & Ketron (1991) and Matthews, Ketron, & Zane (1992) treated our southeastern material as P. umbraticola ssp. coronata. While the distinctive nature of the capsule unifies the southeastern ‘coronata’, southwestern ‘lanceolata’, and Central and South and Central American ‘umbraticola’, the difference in chromosome number and flower color, associated with disjunctly allopatric distributions renders specific recognition equally plausible.

Synonymy: = RAB, S, S13; = Portulaca umbraticola Kunth ssp. coronata (Small) J.F.Matthews & Ketron – FNA4, K1, K3, K4, Matthews & Ketron (1991); < Portulaca umbraticola Kunth – Matthews & Levins (1985a)

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
  • Eastern Mountains and Piedmont: FAC (taxonomic split from wetland indicator species)
  • Great Plains: FAC (taxonomic split from wetland indicator species)

Heliophily: 9

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