Contains 12 accepted taxa overall.
Characteristics
Classification
Citation
POLYGONUM Linnaeus, Sp. Pl. 359. 1753.
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TYPE: Polygonum aviculare Linnaeus, typ. cons.
Species
| Scientific Name | Common Name | Status | Photos |
|---|---|---|---|
| Polygonum argyrocoleon | SILVERSHEATH KNOTWEED | Not Native OBL (NWPL) | |
| Polygonum aviculare | PROSTRATE KNOTWEED | Not Native FAC (NWPL) | |
| Polygonum basiramia | FLORIDA JOINTWEED; TUFTED WIREWEED | Native Endemic Endangered-State Endangered-US | |
| Polygonum delopyrum | HAIRY JOINTWEED | Native Endemic | |
| Polygonum dentoceras | SMALL'S JOINTWEED; WOODY WIREWEED; SANDLACE | Native Endemic Endangered-State Endangered-US | |
| Polygonum fimbriatum | SANDHILL JOINTWEED | Native | |
| Polygonum glaucum | GLAUCOUS KNOTWEED | Native FACU (NWPL) | |
| Polygonum nesomii | LARGEFLOWER JOINTWEED; SANDHILL WIREWEED | Native Endemic | |
| Polygonum pinicola | TALL JOINTWEED | Native | |
| Polygonum polygamum var. brachystachyum | OCTOBER FLOWER | Native Endemic | |
| Polygonum polygamum var. polygamum | OCTOBER FLOWER | Native | |
| Polygonum smallianum | LARGELEAF JOINTWEED | Native Threatened-State |
[Family identification key]
1. Branches appearing directly from the node, not adnate to the stem
2
1. Branch bases adnate to the stem, appearing to arise above the node (Polygonella)
4
2. Stem mostly erect; flowers mostly in terminal, loose, leafy spiciform inflorescences with the distal flowers subtended by leaves subequal to shorter than the flowers
2. Stem prostrate to erect; flowers axillary, with the distal flowers subtended by leaves much longer than the flowers
3
3. Ocrea not pruinose at the base; tepals appressed in fruit; achene dull, tuberculate
3. Ocrea pruinose at the base; tepals ascending-spreading in fruit; achene shiny, smooth
4. Ocrea ciliate at the apex; leaves linear with an acute to acuminate apex
5
4. Ocrea lacking cilia at the apex; leaves generally linear-spatulate to spatulate with an obtuse to rounded apex
8
5. Leaves narrowly linear, usually <1.3 mm wide; inner tepal margin entire to erose; filaments dimorphic
6
5. Leaves linear, larger ones usually 1-3 mm wide; inner tepal margin fimbriate; filaments monomorphic
7
6. Plant with multiple stems at the base of the plant
6. Plant with one main stem at the base of the plant (Polygonella ciliata)
7. Plant 10-60 cm tall; stem minutely scabrous below the inflorescence; leaves without hyaline margins
7. Plant 35-110 cm tall; stem smooth to sparsely scabrous along the angles below the inflorescence; leaves with hyaline margins (Polygonella robusta)
8. Larger leaf blades (3)8-30 mm wide (Polygonella macrophylla)
8. Larger leaf blades 0.3-6(8) mm wide
9
9. Larger leaf blades 16-40(65) mm long (often nearly leafless or with few at maturity); inflorescence (13)20-40 mm long (Polygonella gracilis)
9. Larger leaf blades 4-16(36) mm long (usually abundantly leafy at maturity); inflorescence 4-20(33) mm long
10
10. Plant prostrate; leaf margin not hyaline; stigma and style 0.5-0.8 mm long (Polygonella myriophylla)
10. Plant erect to decumbent; leaf margin hyaline distally; stigma and style ca. 0.1 mm long
11
11. Larger leaf blades 0.5-1.5(2) mm wide
11. Larger leaf blades (2)3-6 mm wide