Bartonia

Contains 3 accepted taxa overall.

Characteristics
Bartonia Muhl. ex Willd.
GENTIANACEAE
SCREWSTEM
View USF Herbarium specimens of this family
Classification
GENTIANALES
Bartonia
Citation
BARTONIA Muhlenberg ex Willdenow, Ges. Naturf. Freunde Berlin Neue Schriften 3: 444. 1801, nom. cons.
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TYPE: Bartonia tenella Muhlenberg ex Willdenow 1803.
Distribution Map Present

This species have been reported in the counties highlighted.

Species
Scientific Name Common Name Herbarium Specimens Status Photos
Bartonia paniculata TWINING SCREWSTEM Native OBL (NWPL) FACW (DEP)
Bartonia verna WHITE SCREWSTEM Native OBL (NWPL) FACW (DEP)
Bartonia virginica YELLOW SCREWSTEM Native FACW (NWPL) FACW (DEP)
Identification Key
1.  Inflorescence often unbranched with a solitary flower, or with up to 8(10) flowers; petal spreading; corolla lobes (4)5-11 mm long, 2.5-3.5 times as long as the calyx; flowering Nov-Apr
B. verna
1.  Inflorescence usually with 3-40 flowers, rarely 1-2; petals usually erect to ascending, sometimes spreading; corolla lobes 2-4 mm long, 1-2 times as long as the calyx; flowering Jul-Nov(Mar)
2
2.  Leaves and branching mostly opposite, the nodes numerous and crowded at the base of the stem; corolla lobes oblong, apically apiculate, erose to entire; stigmas connivent, style slender; fruit dehiscing medially below the style
B. virginica
2.  Leaves and branching mostly alternate, the nodes few and sparse at the base of the stem; corolla lobes lanceolate, apex acute not apiculate, entire; stigmas spreading, style stout; fruit dehiscing apically by separation from the style
3
3.  Stem stiff or stout, often thickened distally, purple; filaments usually purple; anthers often purple, sometimes yellow, 0.5-1 mm long
B. paniculata subsp. iodandra
3.  Stem lax, slender, sometimes twining, mostly green; filaments green to yellow; anthers usually yellow, 0.5 mm long
B. paniculata subsp. paniculata
Genus Synonyms
Synonym Full Citation Basionym Type
Andrewsia Andrewsia Sprengel, Anleit. Kenntn. Gew., ed. 2. 2: 474. 1817, non Andreusia Ventenat 1805. TYPE: = Centaurella Michaux 1803, non Delarbre 1800.
Centaurella Centaurella Michaux, Fl. Bor.-Amer. 1: 97, t. 12. 1803, non Delarbre 1800. TYPE: Non designatus.
Centaurium Centaurium Persoon, Syn. Pl. 1: 137. 1805, non Hill 1756, nec Haller 1768, nec Borkhausen 1796. TYPE: = Centaurella Michaux 1803, non Delarbre 1800.