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Georeference Points from GBIF
Morphology
| Scapes | 4-17 cm long, terete. |
| Leaves | petiolate. |
| Blades | 7-14 cm long x 5.5-10.2 cm wide, not mottled. |
| Flower | sessile. |
| Sepals | 22-47 mm long x 7-10 mm wide. |
| Petals | 30-55 mm long x 4-10 mm wide, red, maroon, purple, green or yellow, not spirally twisted. |
| Anthers | 16-20 mm long, with latrorse dehiscence. |
| Ovary | 4-9 mm long. |
| Stigmas | 7-20 mm long. |
Anthesis
Flowering from early April through May.
Distribution
United States: Idaho, Oregon, and Washington.
Reference(s)
Based on F.W. Case, Jr. Trillium in Flora of North America, volume 26. 2002. Oxford University Press.
A full treatment is available for Trillium at www.eFloras.org
Fact Sheet Developed By
Pedro Oñativia Lake © 2007
  Trillium petiolatum | © Larry Hufford | Washington State University |  Trillium petiolatum | © Larry Hufford | Washington State University |  Distribution Map | |