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Bartonia paniculata (Michaux) Muhlenberg ssp. texana (Correll) K.G. Mathews, Dunne, E. York, & Struwe. Texas Screwstem. Phen: Aug-Oct; Oct-Nov. Hab: Baygalls, acid seepages. Dist: Ssp. texana is endemic to the West Gulf Coastal Plain of w. LA and e. TX, where it is more-or-less sympatric with ssp. paniculata (Mathews et al. 2009).

Origin/Endemic status: Endemic

Taxonomy Comments: The sympatry and similar habitat with its closest relative suggests that species rank may be warranted, despite the somewhat cryptic and overlapping morphological traits.

Synonymy: = FNA14, K3, K4, Mathews et al (2009); = Bartonia texana – Tx, Correll (1966); < Bartonia paniculata (Michx.) Muhl. – GW2; < Bartonia paniculata (Michx.) Muhl. ssp. paniculata – Gillett (1959)

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL (taxonomic split from wetland indicator species)
  • Great Plains: OBL (taxonomic split from wetland indicator species)
  • Midwest: OBL (taxonomic split from wetland indicator species)
  • Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)

Heliophily ?: 4

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