| Trillium viride |
| Green Trillium |
Key Characteristics
Medium-sized forb (40 cm) of rich woods; leaves broadly oval (3-6 cm wide), sessile, strongly mottled; flowers sessile, dark red, petals long (<4 cm).
Status and Rank
- State Status: X - Presumed extirpated (legally 'threatened' if rediscovered)
- State Rank: SX - Presumed extirpated
- Global Rank: G4G5 - Rank is uncertain, ranging from apparently secure to secure
Occurrences
No known occurrences in Michigan
Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.
Habitat
This species is known from a single site, where a small colony of plants appeared in mature beech-maple woodlot previously explored by botanists who did not record it earlier. The colony subsequently disappeared. Given the somewhat suspicious conditions and the fact that this species is sometimes cultivated, it was recently determined that it was not likely native and the species has been proposed for delisting.
Natural Community Types
Associated Plants
Sugar maple and beech.
Management
This colony has not been observed in some time despite much searching of the locality. The species may persist in the region, although it has been noted that it may have been a garden escape. As with most trilliums, it would probably benefit from habitat protection and maintaining the forest canopy.
General Survey Guidelines
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.
Survey Methods
- Meander search
Survey Period: From fourth week of April to fourth week of May
References
Survey References
- Elzinga, C.L., D.W. Salzer, and J.W. Willoughby. 1998. Measuring and Monitoring Plant Populations. The Nature Conservancy and Bureau of Land Management, Denver. BLM Technical Reference 1730-1. 477pp.
- Goff, G.F., G.A. Dawson, and J.J. Rochow. 1982. Site examination for Threatened and Endangered plant species. Environmental Management 6(4): 307-316
- Nelson, J.R. 1984. Rare Plant Field Survey Guidelines. In: J.P. Smith and R. York. Inventory of rare and endangered vascular plants of California. 3rd Ed. California Native Plant Society, Berkeley. 174pp.
- Nelson, J.R. 1986. Rare Plant Surveys: Techniques For Impact Assessment. Natural Areas Journal 5(3):18-30.
- Nelson, J.R. 1987. Rare Plant Surveys: Techniques for Impact Assessment. In: Conservation and management of rare and endangered plants. Ed. T.S. Elias. California Native Plant Society, Sacramento. 8pp.
Technical References
- Case, F.W., Jr. and R. B. Case. 1997. Trilliums. Timber Press, Portland. 285pp.
- Flora of North America Editorial Committee. 2002. Flora of North America, North of Mexico. Volume 26: Magnoliaphyta: Liliidae: Liliales and Orchidales. Oxford University Press, New York. 723pp.
- Gleason, H. A., and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second edition. The New York Botanical Garden, Bronx. 910pp.
- Gray, A. 1950. Gray's Manual of Botany; eighth ed. Van Nostrand Reinghold, New York. 1632pp.
- Holmgren, N.H. 1998. Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the vascular plants of Northeastern United States and adjacent Canada. New York Botanical Garden, Bronx. 937pp.
- Voss, E. G. 1972. Michigan Flora. Part I. Gymnosperms and Monocots. Bulletin of the Cranbrook Institute of Science and University of Michigan Herbarium. 488pp.