Myzorrhiza riparia (L.T. Collins) Weakley. Riparian Broomrape. Phen: Aug-Oct. Hab: Bottomlands, parasitic on annual composites such as Ambrosia trifida, Xanthium strumarium, Ambrosia artemisiifolia, and Helianthus annuus. Dist: VA, s. WV, and DC (James, Potomac, Shenandoah, and New rivers); OH, IN, IL, MO, TN (Mississippi and Ohio rivers and their tributaries); NE and CO south to w. TX and NM.

Origin/Endemic status: Native

Taxonomy Comments: See Collins, Colwell, & Yatskievych (2009) for detailed discussion of the species. See Weakley (2017b) for discussion of generic delineation in Orobanche s.l.

Synonymy: = Weakley (2017b) in Weakley et al (2017); = Aphyllon riparium (L.T.Collins) A.C.Schneid. – K4, Schneider (2016); = Orobanche riparia L.T.Collins – FNA17, Il, K3, Tn, Va, Collins, Colwell, & Yatskievych (2009); < Orobanche ludoviciana Nutt. – F, G, Tx, WV, Musselman (1982); < Orobanche ludoviciana Nutt. ssp. ludoviciana – K1; < Orobanche ludoviciana Nutt. var. ludoviciana – C

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW (name change)
• Eastern Mountains and Piedmont: FACW (name change)
• Great Plains: FACW (name change)
• Midwest: FACW (name change)

Heliophily: 7