Persicaria arifolia

(Linnaeus) Haraldson
Acta Univ. Upsal., Symb. Bot. Upsal. 22: 72. 1978.
Common names: Halberd-leaf tearthumb renouée à feuilles d’arum
IllustratedEndemic
Basionym: Polygonum arifolium Linnaeus Sp. Pl. 1: 364. 1753
Synonyms: Polygonum arifolium var. lentiforme Fernald & Griscom Polygonum arifolium var. pubescens (R. Keller) Fernald Polygonum sagittatum var. pubescens R. Keller Tracaulon arifolium Truellum arifolium
Treatment appears in FNA Volume 5. Treatment on page 577.

Plants annual, 2–15 dm; roots also often arising from proximal nodes. Stems scandent, ribbed, glabrous; prickles 0.5–1 mm. Leaves: ocrea tan or brownish, cylindric, 8–15 mm, chartaceous, base inflated or not, with prickles, margins oblique, ciliate with bristles 0.5–2.5 mm, surface glabrous or appressed- to spreading-pubescent; petiole 1–7 cm; blade broadly hastate to hastate-cordate or triangular, (2–)6.5–13(–18) × (1–)6–11(–16) cm, base truncate to truncate-cordate, margins broadly hastate with lobes divergent, ciliate, sometimes also retrorsely prickly, apex acuminate, faces appressed-pubescent or, rarely, glabrous adaxially, stellate-pubescent or, rarely, glabrous abaxially, major veins often bearing prickles. Inflorescences capitate or paniclelike, uninterrupted, 5–12 × 3–8 mm; peduncle 10–80 mm, retrorsely prickly proximally, stellate-pubescent and stipitate-glandular distally, glands red or pink; ocreolae usually overlapping, sometimes not overlapping proximally, margins eciliate or ciliate with bristles to 0.5 mm. Pedicels mostly ascending, 2–3 mm. Flowers 2–4 per ocreate fascicle; perianth pink or red, often whitish green proximally, glabrous, accrescent, not becoming blue and fleshy in fruit; tepals 4, connate 1/3–1/2 their length, broadly elliptic, 5–6 mm, apex acute to obtuse; stamens (6–)8, filaments distinct, free; anthers pink, elliptic; styles 2, distinct. Achenes included, dark brown to black, biconvex, 3.5–6 × 3–4 mm, shiny, smooth.


Phenology: Flowering Jul–Oct.
Habitat: Shaded swamps, ponds, tidal marshes along rivers, wet ravines in forests
Elevation: 0-600 m

Distribution

V5 1180-distribution-map.gif

N.B., N.S., Ont., P.E.I., Que., Conn., Del., D.C., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Persicaria arifolia"
Harold R. Hinds† +  and Craig C. Freeman +
(Linnaeus) Haraldson +
Polygonum arifolium +
Halberd-leaf tearthumb +  and renouée à feuilles d’arum +
N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +  and Wis. +
0-600 m +
Shaded swamps, ponds, tidal marshes along rivers, wet ravines in forests +
Flowering Jul–Oct. +
Acta Univ. Upsal., Symb. Bot. Upsal. +
Illustrated +  and Endemic +
Polygonum arifolium var. lentiforme +, Polygonum arifolium var. pubescens +, Polygonum sagittatum var. pubescens +, Tracaulon arifolium +  and Truellum arifolium +
Persicaria arifolia +
Persicaria sect. Echinocaulon +
species +