Many similarities to : the rarer Copse Bindweed (Fallopia dumentorum) which grows up to three times longer at 3m, but the tepals have a wider white margin.

Varieties : (Calystegia convolvulus var. subalatum)

Slight resemblance to : Russian Vine (Fallopia baldschuanica) but that grows to 10m or more climbing vigorously over anything upon which it can obtain purchase, but the flowers are white, plentiful and in showy trusses.

No relation to : Calystegia genus Bindweeds such as Hedge Bindweed (Calystegia sepium) , Large Bindweed (Calystegia silvatica) , Hairy Bindweed (Calystegia pulchra) or Sea Bindweed (Calystegia soldanella) [plants with similar names].

Not a true Bindweed such as those belonging to the Convolvulaceae family like Sea Bindweed (Calystegia soldanella) and others belonging to the Calystegia genus, but has similar Ace-of-Spade shaped leaves, and can also climb, but it also sprawls if it finds nothing to clamber up. Fruit a small dull-black triangular 4-5mm long nut on a very short 2mm stalk.

Black Bindweed is a Metallophyte with the potential to absorb 280ppm by weight of copper via its fine roots.

Three previously unknown flavonoids have been isolated from Black Bindweed, Falloconvalin A, Falloconvalin B and Quercetin-3-O-(2-E-sinapoxyl)-glucopyranoside [although your Author can now find no other source to back this up, perhaps they have differing common names].

But the Flavans and ProAnthoCyanivones(?!) IsoVitexin, Vitexin, IsoOrientin, Orientin, Apigenin, and the 6,8-glycoside and 6,8-diglycosides of Luteolin were found in Black Bindweed [as well as in Buckwheat (Fagopyrum esculentum), Copse Bindweed (Fagopyrum dumetorum)].