Ranunculus trichophyllus Chaix. Subgenus: Auricomus. Section: Batrachium. Threadleaf Water-crowfoot, White Water-crowfoot. Phen: May-Sep. Hab: Pools, slow-moving water. Dist: Circumboreal, south in North America to VA, c. TN, IL, IA, NE, NM, AZ, CA, and Mexico.

Origin/Endemic status: Native

Synonymy: = Il, K3, K4, Mi, Wiegleb, Bobrov, & Zalewska-Gałosz (2017); = n/a – Tat; = Ranunculus aquatilis L. var. capillaceus (Thuill.) DC.; = Ranunculus aquatilis L. var. diffusus With. – FNA3, Tn; > Batrachium flaccidum (Pers.) Rupr. – S13; > Batrachium trichophyllum (Chaix) Bosch var. caespitosum Britton & A.Br. – S13; > Batrachium trichopyllum (Chaix) Bosch var. trichophyllum – S13; < Ranunculus aquatilis L. – Mex; < Ranunculus aquatilis L. var. diffusus With. – Pa; > Ranunculus trichophyllus Chaix var. calvescens (W.B.Drew) L.D.Benson – C, F, G; > Ranunculus trichophyllus Chaix var. eradicatus – F; > Ranunculus trichophyllus Chaix var. trichophyllus – C, F, G

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Wetland Indicator Status:

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

Heliophily: 8