Family: Dock & Knotweed [Polygonaceae]

Fagopyrum

Fallopia

Koenigia

Muehlenbeckia

Oxyria

Persicaria

Polygonum

Rheum

Rumex



[PERSICARIA] Bistorts

 

PERSICARIA HYBRID CHART (shrunk)
Hybrid Chart: BISTORT (larger)

Persicaria SPECIES LACKING HYBRIDS
(Persicaria affinis) Himalayan Bistort
(Persicaria alpina) Alpine Knotweed
(Persicaria amphibia) Amphibious Bistort
(Persicaria amplexicaulis) Red Bistort
(Persicaria bistorta) Common Bistort
(Persicaria campanulata) Lesser Knotweed
(Persicaria capitata) Pink-headed Persicaria
(Persicaria mollis) Soft Knotweed
(Persicaria nepalensis) Nepal Persicaria
(Persicaria pensylvanica) Pinkweed
(Persicaria sagittata) America Tear-thumb
(Persicaria senegalensis)
(Persicaria vacciniifolia)
(Persicaria vivipara) Alpine Bistort
(Persicaria wallichii) Himalayan Knotweed
(Persicaria weyrichii) Chinese Knotweed

Amphibious Bistort. (Persicaria amphibia) Photo: © RWD

Redleg. (Persicaria maculosa) Photo: © RWD

Lesser Knotweed (Persicaria campanulata) Photo: © RWD

Red Bistort (Persicaria amplexicaulis) Photo: © RWD

Pale Persicaria (Persicaria lapathifolia) Photo: © RWD

Alpine Bistort (Persicaria vivipara) Photo: © RWD



[FALLOPIA] Knotweeds

 

[Fallopia]
KNOTWEED HYBRID CHART
[Fallopia]
KNOTWEED
HYBRIDS
BSBI MAPS
Russian
Vine

(baldschuanica)
Japanese
Knotweed

(japonica)
Giant
Knotweed

(sachalinensis)
Giant
Knotweed

(sachalinensis)
  Fallopia
×
bohemica
Japanese
Knotweed

(japonica)
Fallopia
×
conollyana
Fallopia
×
bohemica
Russian
Vine

(baldschuanica)
Fallopia
×
conollyana
 

Fallopia SPECIES LACKING HYBRIDS
(Fallopia convolvulus) Black Bindweed
(Fallopia dumetorum) Copse-bindweed

Giant Knotweed (Fallopia sachalinensis) Photo: © RWD

Russian Vine (Fallopia baldschuanica) Photo: © RWD

Black Bindweed (Fallopia convolvulus) Photo: © RWD



[RHEUM] Rhubarbs

Rhubarb (Rheum × rhabarbarum) Photo: © RWD



[FAGOPYRUM] Buckwheats

Buckwheat (Fagopyrum esculentum) Photo: © Ruth Dawson



[POLYGONUM] Knotgrasses

Knotgrass (Polygonum aviculare) Photo: © RWD

Ray's Knotgrass (Polygonum oxyspermum) Photo: © Paula O'Meara



[RUMEX] Docks

Although Docks do indeed have flowers they are seldom seen in real life and seldom mentioned or shown in identification books because the flowers themselves must have no unique identifying features apart from the shape of the tepals; unlike as with the fruits which come afterwards and last a lot longer than the flowers.

The flowers have 3 outer tepals plus three inner tepals. When in fruit the inner tepals cradle the fruits, which number between 1 to 3 depending upon species. For ID purposes, the shape and size and whether or not the (inner) tepals [the outer tepals have disappeared when in fruit?] is important, as are the number and shape and size of the fruits.

Other characteristics of stance, jizz, stems, leaves, height and habitat are also important in identification.

Docks do tend to hybridize a lot with each other (see table) thus identification may be very difficult as a result, especially for any common hybrids, such as that between Curled Dock (Rumex crispus) and Broad-leaved Dock (Rumex obtusifolia) (which is the most frequent hybrid in the Dock Family but the hybrid although it is the most fertile hybrid of the Docks nevertheless it has low fertility). The hybrid between Wood Dock (Rumex sanguineus)and Clustered Dock (Rumex conglomeratus) is the second most widespread dock hybrid. But the hybrids only occur in mixed populations, so if either parent is absent, then the hybrid is unlikely to be present.

 

RUMEX HYBRID CHART (shrunk)
Hybrid Chart: RUMEX (larger)

Rumex SPECIES LACKING HYBRIDS
(Rumex acetosa) Common Sorrel
(Rumex acetosa subsp. ambiguus) Common Sorrel
(Rumex acetosa subsp. biformis)
(Rumex acetosa subsp. hibernicus) Common Sorrel
(Rumex acetosella) Sheep's Sorrel
(Rumex acetosella subsp. acetosella) Sheep's Sorrel
(Rumex acetosella subsp. acetosella
var. tenuifolius)
(Rumex acetosella subsp. pyrenaicus) Sheep's Sorrel
(Rumex alpinus) Monk's-rhubarb
(Rumex altissimus)
(Rumex brownii) Hooked Dock
(Rumex bucephalophorus)
(Rumex conglomeratus x cristatus) A dock hybrid
(Rumex crispus subsp. littoreus) Curled Dock
(Rumex crispus subsp. uliginosus) Curled Dock
(Rumex crispus x rupestris) A dock hybrid
(Rumex crystallinus)
(Rumex dentatus) Aegean Dock
(Rumex obovatus) Obovate-leaved Dock
(Rumex salicifolius) Willow-leaved Dock
(Rumex scutatus) French Sorrel
(Rumex stenophyllus)

Golden Dock (Rumex maritimus) Photo: © Paula O'Meara

Clustered Dock (Rumex conglomeratus) Photo: © RWD

Wood Dock (Rumex sanguineus) Photo: © RWD

Curled Dock (Rumex crispus ssp. littoreus) Photo: © RWD

Common Sorrel (Rumex acetosa) Photo: © RWD

Sheep's Sorrel (Rumex acetosella) Photo: © RWD



[OXYRIA] Mountain-Sorrel

Mountain Sorrel (Oxyria digyna) Photo: © Gordon Anderson

Family: Dock & Knotweed [Polygonaceae]

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