| Symphyotrichum spathulatum (Lindl.) G.L. Nesom | |
| Publ. & Syn. | Tripolium occidentale Nutt., Trans. Amer. Philos. Soc., n. s., 7: 296 (1840). Holotype (PH): North America: Rocky Mountains, leg. Lewis. - Aster occidentalis (Nutt.) Torr. & A. Gray, Fl. N. Amer. 2: 164 (1841). |
| Notes | Symphyotrichum spathulatum reaches the Borderline Arctic in the Great Bear Lake area in the Northwest Territories (Scoggan 1979). Nesom (1994) divided Symphyotrichum spathulatum on four varieties. Aster occidentalis, the plant reported from the Borderline Arctic, was included by him and by Brouillet et al. (2006) in var. spathulatum. |
| Chromosomes | (1) 8 (2x). - Jones (1980, for Aster occidentalis). (2) 16 (4x). - Canada (W), U.S.A. (W). - Numerous reports, two for Aster occidentalis. (3) 24 ca. 27 (ca. 6x). - North America (W). - Anderson et al. (1974); Allen (1984). (4) 32 (8x). - Canada (W), U.S.A. (W). - Several reports, one for Aster occidentalis var. intermedius. (5) 64 (16x). - North America (W). - At least three reports. |
| Geography | North American (NW): (CAN). |
| Distribution | N = F E = b CC = b [ key ] |
| Parent taxon | Symphyotrichum Nees |
| PAF ID | 860505 |