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halberd-leaf smartweed, halberd-leaf tearthumb, renouée à feuilles d'arum

kiss-me-Over-the-garden-gate, Prince's-feather smartweed, princess-feather, renouée orientale

Habit Plants annual, 2–15 dm; roots also often arising from proximal nodes. Plants annual, 6–25 dm; roots not also arising from proximal nodes; rhizomes and stolons absent.
Stems

scandent, ribbed, glabrous;

prickles 0.5–1 mm.

erect, simple or branched distally, usually ribbed, strigose or glabrescent proximally, pilose to hirsute distally.

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.

ocrea brownish proximally, green distally, narrowly funnelform, 10–20 mm, chartaceous proximally, foliaceous distally, rarely chartaceous throughout, base inflated or not, margins truncate, ciliate with bristles 1–3 mm, surface densely strigose to hispid, not glandular-punctate;

petiole 1–8.5(–14) cm, densely pilose to hirsute;

blade without dark triangular or lunate blotch adaxially, ovate, 6–25(–30) × 3–17 cm, base cordate to truncate, margins scabrous to ciliate, apex acuminate, faces minutely strigose to densely hirsute, especially along veins abaxially, not glandular-punctate.

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.

mostly terminal, nodding or erect, uninterrupted, 10–150 × 8–18 mm;

peduncle 20–100 mm, hirsute;

ocreolae overlapping, margins ciliate with bristles 0.2–1 mm.

Pedicels

mostly ascending, 2–3 mm.

ascending to spreading, 1–4 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.

(1–)2–5 per ocreate fascicle, homostylous;

perianth roseate to red, glabrous, not glandular-punctate, slightly accrescent;

tepals 5, connate in proximal 1/3, obovate, 3–4.5 mm, veins prominent or not, not anchor-shaped, margins entire, apex obtuse to rounded;

stamens 6–8, included or exserted;

anthers pink or red, elliptic;

styles 2, connate proximally.

Achenes

included, dark brown to black, biconvex, 3.5–6 × 3–4 mm, shiny, smooth.

included, dark brown to black, discoid, 2.5–3.5 × 3–3.5 mm, shiny to dull, smooth to minutely granulate.

Persicaria arifolia

Persicaria orientalis

Phenology Flowering Jul–Oct. Flowering Jun–Oct.
Habitat Shaded swamps, ponds, tidal marshes along rivers, wet ravines in forests Moist waste places
Elevation 0-600 m (0-2000 ft) 0-500 m (0-1600 ft)
Distribution
from FNA
CT; DC; DE; GA; IL; IN; KY; LA; MA; MD; ME; MI; MN; MO; NC; NH; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WA; WI; WV; NB; NS; ON; PE; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WI; WV; NB; ON; QC; s Asia (India) [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Persicaria orientalis was introduced as a garden ornamental. It often persists around homesteads and barnyards, and occasionally escapes and becomes weedy in moist waste places. A collection made in 1853 by F. V. Hayden at Fort Pierre, South Dakota (MO), is assumed to have come from a cultivated plant.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 5, p. 577. FNA vol. 5, p. 591.
Parent taxa Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Echinocaulon Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Persicaria
Sibling taxa
P. amphibia, P. bicornis, P. bungeana, P. capitata, P. careyi, P. chinensis, P. glabra, P. hirsuta, P. hydropiper, P. hydropiperoides, P. lapathifolia, P. longiseta, P. maculosa, P. meisneriana, P. minor, P. nepalensis, P. orientalis, P. pensylvanica, P. perfoliata, P. punctata, P. robustior, P. sagittata, P. setacea, P. virginiana, P. wallichii
P. amphibia, P. arifolia, P. bicornis, P. bungeana, P. capitata, P. careyi, P. chinensis, P. glabra, P. hirsuta, P. hydropiper, P. hydropiperoides, P. lapathifolia, P. longiseta, P. maculosa, P. meisneriana, P. minor, P. nepalensis, P. pensylvanica, P. perfoliata, P. punctata, P. robustior, P. sagittata, P. setacea, P. virginiana, P. wallichii
Synonyms Polygonum arifolium, Polygonum arifolium var. lentiforme, Polygonum arifolium var. pubescens, Polygonum sagittatum var. pubescens, Tracaulon arifolium, Truellum arifolium Polygonum orientale
Name authority (Linnaeus) Haraldson: Acta Univ. Upsal., Symb. Bot. Upsal. 22: 72. (1978) (Linnaeus) Spach: Hist. Nat. Vég. 10: 537. (1841)
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