Fallopia convolvulus
Wild Buckwheat

Achene in Tepals, Side


The fruit is an achene and is enclosed by the tepals. The very tip of the achene is exposed at the top of the tepals in this specimen, but the achene does not clearly extend beyond the tepals.

Convolvulus: Answers to key questions in Flora of North America and University of Saskatchewan Virtual Herbarium of Rare Plants at Risk in Saskatchewan leading to this species. 

plants annual;  NOT [plants perennial or annual]

ocreae bases glabrous or scabrid; NOT [ocreae bases fringed with reflexed hairs and slender bristles]

fruiting tepals to 5 mm long; NOT [fruiting tepals to 15 mm long]

fruiting tepals without wings or, rarely, with wings 0.4-0.9 mm wide; NOT [fruiting tepals with wings (0.7) 1.5-2.1 mm wide]

fruiting tepals glabrous or with blunt, hyaline hairs; NOT [tepals glabrous]

achenes minutely granular-tuberculate; NOT [achenes smooth]

achenes dull; NOT [achenes shiny]


Fallopia: Answers to key questions in Budd's Flora and Vascular Plants of Alberta: An Illustrated Guide leading to this genus.

stems twining or sprawling; NOT [stems mostly erect, ascending, not twining]

leaves mainly on the stem; NOT [leaves mostly basal]

leaves broad; NOT [leaves linear, lanceolate or oblong], NOT [leaves round to kidney-shaped]

leaves hastate at base or heart-shaped

leaves with stipules that encircle/sheath the stem (ocreae); NOT [leaves without stipules sheathing the stem]

ocreae never 2-lobed near the tip; NOT [ocreae 2-lobed near the tip]

ocreae papery and thin but not transparent; NOT [ocreae often nearly transparent]

ocreae tan to brownish; NOT [ocreae silvery]

flowers clusters without a whorl of bracts; NOT [flower clusters with whorl of leafy to scale-like bracts at the base]

flowers perfect

tepals 5

outer tepals winged or keeled; NOT [outer tepals neither winged nor keeled]

inner tepals rarely enlarged in fruit; NOT [inner tepals usually enlarged in fruit]

stamens 6-8

stigmas not tufted

achenes completely enclosed  by tepals or barely extending beyond them; NOT [achenes clearly extending beyond the tepals]

achenes more or less unwinged; NOT [achenes lens-shaped, broadly winged]


Polygonaceae: Answers to key questions in Budd's Flora leading to this family. These answers do not all apply to all genera in Polygonaceae but they do apply to all Fallopia in Saskatchewan.

herbs; NOT [shrubs or trees]

land plants; NOT [water plants]

plants not parasitic on trees

plants with more than one pair of leaves; NOT [plants with a single pair of large reniform leaves]

leaves alternate; NOT [leaves opposite]

stipules present

stipules forming a sheath above nodes

flowers perfect

perianth segments all alike, not differentiated into sepals and petals