| Polygonaceae | |
Polygonum douglasii subsp. austiniae
| (Greene) A.E. Murray | Kalmia 12: 23 | 1982 |
| Polygonaceae | ** |
Polygonum douglasii subsp. austiniae
| (Greene) J.C. Hickman | Madroño 31(4): 250 | 1984 |
| Polygonaceae | |
Polygonum douglasii var. austiniae
| (Greene) M.E. Jones | Contr. W. Bot. 12: 75 | 1908 |
| Polygonaceae | |
Polygonum douglasii subsp. douglasii
| | | |
| Polygonaceae | |
Polygonum douglasii var. douglasii
| | | |
| Polygonaceae | |
Polygonum douglasii subsp. engelmannii
| (Greene) Kartesz & Gandhi | Phytologia 68(6): 424 | 1990 |
| Polygonaceae | |
Polygonum douglasii subsp. johnstonii
| (Munz) J.C. Hickman | Madroño 31(4): 250 | 1984 |
| Polygonaceae | |
Polygonum douglasii var. johnstonii
| Munz | Man. S. Calif. Bot. 131, 597–598, f. 60 | 1935 |
| Polygonaceae | |
Polygonum douglasii var. latifolium
| (Engelm.) Greene | Bull. Calif. Acad. Sci. 1(3): 125 | 1885 |
| Polygonaceae | |
Polygonum douglasii subsp. majus
| (Meisn.) J.C. Hickman | Madroño 31(4): 250 | 1984 |
| Polygonaceae | |
Polygonum douglasii var. microspermum
| (Engelm.) Dorn | Vasc. Pl. Wyoming 299 | 1988 |
| Polygonaceae | |
Polygonum douglasii var. montanum
| Small | Monogr. Polygonum 118 | 1895 |
| Polygonaceae | |
Polygonum douglasii subsp. nuttallii
| (Small) J.C. Hickman | Madroño 31(4): 250 | 1984 |
| Polygonaceae | |
Polygonum douglasii subsp. spergulariiforme
| (Meisn. ex Small) J.C. Hickman | Madroño 31(4): 251 | 1984 |
| Polygonaceae | |
Polygonum douglasii var. utahense
| (Brenckle & Cottam) S.L. Welsh | Utah Fl. (ed. 3) 518 | 2003 |