| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Polygonaceae | Persicaria amphibia ssp. laevimarginata | Water Smartweed | Marshes, wet disturbed areas. | NL (Newfoundland), NU, and AK south to SC, TN, TX, and CA, and southward into the New World tropics. |  |
| Polygonaceae | Persicaria arifolia | Halberd-leaf Tearthumb | Marshes, wet thickets. | NS west to MN. south to se. GA, ne. FL (Slaughter 2014; Franck et al. 2016), w. NC, and w. TN. |  |
| Polygonaceae | Persicaria bicornis | Pink Smartweed | Moist disturbed areas, ditches. | IL, IA, SD, and WY south to LA, TX, and NM. |  |
| Polygonaceae | Persicaria capitata | Pink-head Knotweed | Disturbed blackland prairies, other disturbed areas. | Native of s. Asia. See Singhurst, Mink, & Holmes (2013) for additional information about the naturalization of this species in TX. Reported for Orleans Parish, LA. Reported for Montgomery County, AL (Diamond & Keener 2021). | |
| Polygonaceae | Persicaria careyi | Carey's Knotweed | Moist soils, disturbed areas. | NB west to ON and MN, south to VA, KY, IL, seemingly widely scattered. Reported for sc. PA (Rhoads & Klein 1993; Rhoads & Block 2007), DE, NJ, and MD (Kartesz 1999). |  |
| Polygonaceae | Persicaria chinensis | Chinese Knotweed | Disturbed areas. | Native of Asia. Introduced in MD and NJ. |  |
| Polygonaceae | Persicaria coccinea | Red-careless | Shores, streams, sluggish water. | Throughout North America. |  |
| Polygonaceae | Persicaria densiflora | Dense-flower Smartweed | Swamp forests. | The Persicaria glabra complex is widespread in the Neotropics, in North America north to s. NJ, VA, KY, MO, and TX. The distribution of Persicaria densiflora is unclear. |  |
| Polygonaceae | Persicaria extremiorientalis | East Asian Smartweed | Disturbed areas, roadsides, roadsides. | Native of Japan, China, Korea, and Sakhalin. Reported for Horry County, SC (Bradley et al. [in prep.]). |  |
| Polygonaceae | Persicaria filiformis | Japanese Jumpseed | Suburban woodlands, escaping from horticultural use. | Native of e. Asia. Reported as naturalizing in Baltimore County, MD, and Arlington County, VA (Simmons et al. 2020), but probably more widespread than currently mapped. |  |
| Polygonaceae | Persicaria hirsuta | Hairy Smartweed | Pondcypress savannas, depression ponds in pinelands. | Se. NC south to c. peninsular FL, west to s. MS. |  |
| Polygonaceae | Persicaria hydropiper | Common Smartweed, Waterpepper, Marshpepper Smartweed | Wet pastures, barnyards, ditches. | Native of Europe. |  |
| Polygonaceae | Persicaria hydropiperoides | Waterpepper | Swamp forests, streams, ditches. | NS, ON, and AK, south to FL, TX, and CA, and into the New World tropics. |  |
| Polygonaceae | Persicaria lapathifolia | Willow-weed, Dockleaf Smartweed, Pale Smartweed | Bottomlands, bottomland fields, disturbed areas. | Nearly cosmopolitan in current distribution, the original distributions hard to interpret, sometimes regarded as having both native and introduced elements in North America. |  |
| Polygonaceae | Persicaria longiseta | Longbristle Smartweed, Bristly Lady’s-thumb, Creeping Smartweed | Disturbed areas, lawns, ditches. | Native of Asia. |  |
| Polygonaceae | Persicaria maculosa | Lady’s-thumb, Heart’s-ease | Disturbed areas. | Native of Eurasia. |  |
| Polygonaceae | Persicaria meisneriana var. beyrichiana | Mexican Tearthumb | Wet savannas, blackwater river floodplains, ditches; sometimes considered only introduced in southeastern North America, but probably native. | E. SC south to FL, west to LA; Mexico (CHP, VER) and Central America south to n. South America; Brazil; se. Africa. Reported for Mobile County, AL (Barger et al. 2023). | |
| Polygonaceae | Persicaria minor | Small Water-pepper | Disturbed moist areas, marshes. | Native of Europe. Reported for Camden County, NJ by Schmidt (2023). | |
| Polygonaceae | Persicaria nepalensis | Nepalese Smartweed | River banks, shores, other moist disturbed areas. Sometimes grown as a groundcover. | Native of e. Asia. |  |
| Polygonaceae | Persicaria orientalis | Kiss-me-over-the-garden-gate, Prince’s-feather, Prince’s-plume, Princess-feather | Barnyards, disturbed areas, garden edges. | Native of Eurasia. |  |
| Polygonaceae | Persicaria pensylvanica | Pinkweed, Common Smartweed, Pennsylvania Smartweed | Disturbed areas, bottomlands. | NL (Newfoundland), ON, MT, and CA, south to FL, TX, AZ, and to c. Mexico; disjunct (perhaps only introduced?) in AK, Ecuador, Europe. |  |
| Polygonaceae | Persicaria perfoliata | Mile-a-minute-vine, Asiatic Tearthumb, Devil's-tail Tearthumb | Roadsides, banks, powerline rights-of-way. | Native of e. Asia. Introduced and spreading rapidly in n. VA, MD, PA, DC, and WV. Adler (1999) reports it as occurring in PA, MD, VA, WV, DE, OH, NJ, and DC. Poindexter (2010a) reports its discovery at three separate locations in Alleghany County, NC. |  |
| Polygonaceae | Persicaria posumbu | Asian Lady's-thumb, Creeping Himalayan Smartweed | Floodplains, other moist shaded forests. | Native of e. Asia. |  |
| Polygonaceae | Persicaria punctata | Dotted Smartweed | Swamp forests, bottomlands, marshes. | NS, ON, and BC south to FL, TX, and CA, south into the New World tropics. |  |
| Polygonaceae | Persicaria robustior | Water Smartweed | Peaty shores or semi-aquatic in water. | NS, QC, MI, MO, south irregularly to s. FL and TX, and south into tropical America. Probably under-represented as to states of occurrence because of frequent synonymization. |  |
| Polygonaceae | Persicaria sagittata | Arrowleaf Tearthumb, Arrowvine, Scratch-grass | Marshes, bogs, beaver impoundments, wet thickets. | NL (Newfoundland) west to MB, south to Panhandle FL and e. TX; China, Manchuria, India, Siberia, Korea, and Japan. |  |
| Polygonaceae | Persicaria setacea | Swamp Smartweed | Swamp forests, bottomland forests. | MA, MI, MO, and OK south to s. FL and TX. Discovered in Ripley County, IN (S. Namestnik, pers.comm. 2022). |  |
| Polygonaceae | Persicaria virginiana | Jumpseed, Virginia Knotweed | Floodplains, other moist forests. | NH, QC, MN, and NE, south to n. peninsular FL and TX; disjunct in c. Mexico (PUE, VER). |  |
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