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Bidens alba (Linnaeus) A.P. de Candolle var. radiata (Schultz 'Bipontinus') Ballard ex T.E. Melchert. Common name: Romerillo, Shepherd's-Needle, White-flowered Bidens, White-flowered Spanish-Needles. Habitat: Disturbed areas. Distribution: Adventive from the New World tropics, possibly native in s. FL. Reported for Clarksville, Montgomery County, TN (Kraft 2016).

Origin/Endemic status: Neotropics

Taxonomy Comments: Bidens alba var. radiata is part of a complex that is widespread and native in tropical America. It has been variously split and lumped to varyingly degrees. We here follow the work of the most recent monographer of the group, Ballard (1986), who recognized three species and seven taxa in the complex. Only B. alba var. radiata and B. pilosa (in a narrow sense) are present in our region; the other five taxa occur in Mexico, Central America, and South America.

Synonymy ⓘ: = Bah, Ballard (1986); = Bidens leucantha (L.) Willd. ex Walp. — S13; = Bidens pilosa L. var. radiata Sch.-Bip. — F, Sherff & Alexander (1955); = n/a — C, Pa; < Bidens alba (L.) DC. — Ar, Fl7, Il, NE, POWO, WH3; < Bidens pilosa L. — FNA21, K4, RAB, S, SE1, Lizarazu et al (2024); Bidens pilosa Linnaeus. Basionym: Bidens pilosa L. forma radiata Sch. Bip. 1844

Links to other floras: < Bidens pilosa - FNA21

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Wetland Indicator Status:

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

Heliophily ⓘ: 7

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image of plant© Aidan Campos source | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷

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Horticultural Information

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