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Ranunculus ambigens S. Wats.  

No occurrences found

Family: Ranunculaceae
waterplantain spearwort
[Ranunculus obtusiusculus Raf.]
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  • FNA
  • Gleason & Cronquist
  • Resources
Alan T. Whittemore in Flora of North America (vol. 3)
Stems erect or ascending, rooting at proximal nodes, glabrous or sparsely hirsute. Roots not thickened basally, glabrous or somewhat canescent proximally. Proximal cauline leaf blades lanceolate, 5.9-12.2 × 1.1-2.4 cm, base rounded-obtuse to acuminate, margins denticulate, apex acuminate. Inflorescences: bracts linear or lanceolate. Flowers: receptacle glabrous; sepals 5, spreading or sometimes reflexed from base, 3-5 × 2-3 mm, glabrous; petals 5, 5-8 × 2-3 mm; nectary scales glabrous. Heads of achenes short-ovoid to depressed-globose, 5-7 × 4-8 mm; achenes 1.8 × 1.2-1.4 mm, glabrous; beak lanceolate, straight, 0.6-1.2 mm. Flowering late spring-summer (May-Aug). Creeks, ponds, ditches, marshes; 0-700 m; Ala., Conn., Del., D.C., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Va., W.Va. The name Ranunculus obtusiusculus Rafinesque has been mistakenly used for R . ambigens .

Vascular plants of NE US and adjacent Canada
Stems hollow, rooting from the lower nodes, to 1 m, ascending; cauline lvs with dilated, sheathing petiole and well defined, lanceolate blade to 15 נ3 cm, usually denticulate; pet 5-10 mm, equaling or a little exceeding the sep; achenes 1.5-2 mm, the horizontal beak 1-1.3 mm. Swamps, marshes, and shores, mostly in heavy soil; Me. to Minn., s. to Va., Tenn., and La. June-Sept. (R. obtusiusculus Raf., probably misapplied)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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