genus
Smartweeds
Persicaria
Field notes
Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae. Plants of the genus are known commonly as knotweeds or smartweeds. It has a cosmopolitan distribution, with species occurring nearly worldwide. The genus was segregated from Polygonum.
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- American Jumpseed native
- Low Smartweed introduced
- Spotted Lady's Thumb introduced
- Water Smartweed native
- Pale Smartweed native
- Pink Knotweed introduced
- Swamp Smartweed native
- Arrow-leaved Tearthumb native
- Mile-a-minute Weed introduced
- Pinkweed native
- Dotted Smartweed native
- Waterpepper native
- China Knotweed introduced
- Slender Knotweed present
- Halberd-leaved Tearthumb native
- Asian Jumpseed introduced
- Far Eastern Smartweed introduced
- Nepal Persicaria present
- Small Water-pepper introduced
- Pink Smartweed native
- Prickled-vine Smartweed
- Dense-flowered Smartweed native
- Asian Lady's Thumb introduced
- Thunberg’s Smartweed present
Range
Greener is more native, amber more introduced; paler is less certain. How this was decided
Top native smartweeds All
Native to the US, ranked by caterpillars, then bees and other hosts, food, flowers and shelter.
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Waterpepper
Persicaria hydropiper
caterpillars
12
hosts
1
food
32
flowers
66
-
Dotted Smartweed
Persicaria punctata
caterpillars
12
hosts
1
food
30
flowers
57
-
Pinkweed
Persicaria pensylvanica
caterpillars
8
hosts
1
food
39
flowers
82
-
Pale Smartweed
Persicaria lapathifolia
caterpillars
6
hosts
1
food
46
flowers
87
-
Water Smartweed
Persicaria amphibia
caterpillars
5
hosts
2
food
39
flowers
83
-
Dense-flowered Smartweed
Persicaria glabra
caterpillars
3
hosts
1
food
18
flowers
44
-
Swamp Smartweed
Persicaria hydropiperoides
caterpillars
1
hosts
1
food
56
flowers
104
-
Bog Smartweed
Persicaria setacea
caterpillars
1
hosts
1
food
12
flowers
43
-
American Jumpseed
Persicaria virginiana
hosts
1
food
14
flowers
59
-
Arrow-leaved Tearthumb
Persicaria sagittata
hosts
1
food
14
flowers
50
-
Halberd-leaved Tearthumb
Persicaria arifolia
hosts
1
food
13
flowers
43
-
Stout Smartweed
Persicaria robustior
hosts
1
food
12
flowers
43
-
Carey's Smartweed
Persicaria careyi
hosts
1
food
11
flowers
38
-
Persicaria hirsuta
hosts
1
food
10
flowers
39
-
Pink Smartweed
Persicaria bicornis
hosts
1
food
9
flowers
106