Compilation
Ranunculus subrigidus

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Name

Identification
Ranunculus subrigidus W. B. Drew [family RANUNCULACEAE ] (stored under name); Verified by W. B. Drew, 1936
Related name
  • Ranunculus subrigidus

Flora

Entry for Ranunculus aquatilis Linnaeus var. diffusus Withering [family RANUNCULACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 3,
Names
Ranunculus aquatilis Linnaeus var. diffusus Withering [family RANUNCULACEAE], Arr. Brit. Pl. ed., 3, 2: 507. 1796
Batrachium circinatum (Sibthorp) Spach subsp. subrigidum (W. B. Drew) A. Löve & D. Löve [family RANUNCULACEAE]
Batrachium flaccidum (Persoon) Ruprecht [family RANUNCULACEAE]
Batrachium longirostris (Godron) F. W. Schultz [family RANUNCULACEAE]
Batrachium trichophyllum (Chaix) Bosch [family RANUNCULACEAE]
Batrachium trichophyllum subsp. lutulentum (Perrier & Songeon) Janchen ex V. V. Petrovsky [family RANUNCULACEAE]
Ranunculus aquatilis var. calvescens (W. B. Drew) L. D. Benson [family RANUNCULACEAE]
Ranunculus aquatilis var. capillaceus (Thuillier) de Candolle [family RANUNCULACEAE]
Ranunculus aquatilis var. eradicatus Laestadius [family RANUNCULACEAE]
Ranunculus aquatilis var. harrisii L. D. Benson [family RANUNCULACEAE]
Ranunculus aquatilis var. longirostris (Godron) Lawson [family RANUNCULACEAE]
Ranunculus aquatilis var. porteri (Britton) L. D. Benson [family RANUNCULACEAE]
Ranunculus aquatilis var. subrigidus (W. B. Drew) Breitung [family RANUNCULACEAE]
Ranunculus circinatus Sibthorp var. subrigidus (W. B. Drew) L. D. Benson [family RANUNCULACEAE]
Ranunculus confervoides (Fries) Fries [family RANUNCULACEAE]
Ranunculus longirostris Godron [family RANUNCULACEAE]
Ranunculus subrigidus W. B. Drew [family RANUNCULACEAE]
Ranunculus trichophyllus (Chaix) Bosch [family RANUNCULACEAE]
Ranunculus trichophyllus var. calvescens W. B. Drew [family RANUNCULACEAE]
Ranunculus trichophllus var. eradicatus (Laestadius) W. B. Drew [family RANUNCULACEAE]
Ranunculus trichophyllus subsp. lutulentus (Perrier & Songeon) Vierhapper [family RANUNCULACEAE]
Information
Leaves all filiform-dissected. Achenes 1-1.8 × 0.8-1.2 mm; beak 0.2-1.2 mm. 2n = 16, 32, 48.
Phenology
Flowering spring-summer (Apr-Sep)
Altitude range
0-3200 m
Distribution
GreenlandMexicoEurasiaAustralia.USA Ala.USA AlaskaUSA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.Mex.USA N.J.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA W.Va.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld.Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.Canada Yukon
Discussion
Populations of Ranunculus aquatilis var. diffusus with long achene beaks are not known from the Old World. In North America, beak length varies continuously over the whole range given for the variety, and separation of plants with unusually long beaks as R. longirostris is not tenable. Ranunculus aquatilis var. diffusus shows geographic variation, and some regional forms have been recognized as separate varieties. Dwarf creeping arctic plants may be called R. aquatilis var. eradicatum, plants with sparsely pubescent or glabrous receptacle from eastern North America may be called R. aquatilis var. calvescens, plants with linear, noncapillary leaf segments from the northern Great Basin may be called R. aquatilis var. porteri, and very robust plants from Oregon and northernmost California may be called R. aquatilis var. harrisii. Extreme forms of these races are recognizable, but they intergrade and many specimens cannot be confidently assigned to one or another of them.
The Eurasian species Ranunculus circinatus Sibthorp has been reported from North America. These reports are based on specimens of R. aquatilis var. diffusus.

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