ATTACHMENT SS2 REGION 2 SENSITIVE SPECIES EVALUATION FORM Species: Trillium ovatum/Western Wake-robin, Western Trillium Criteria Rank Rationale Literature Citations T. ovatum is a small, delicate member of the Lily Family and occurs along streams and • CNHP 1 A in moist shaded forests. It only occurs in Routt and Jackson counties in CO. There is Distribution • USDA, NRCS. 2002. The PLANTS within R2 mention of a disjunct population in WY, however, no additional information could be Database, Version 3.5 located. There are 14 records of this species in CO; it is ranked SR. The plant (http://plants.usda.gov). National evaluation species list indicates this plant may occur on the ARP in the Sulphur RD, on Plant Data Center, Baton Rouge, the MBR in the Hahns Peak-Bears Ears, Parks RD, MBNF in WY (disjunct). Only one LA 70874-4490 USA. (Accessed reference could be found on population locations (see map below). This plant is not October 3, 2002) reported in CNHP or GIS databases provided. T. ovatum may not have been • NatureServe Explorer: An online observed in CO since 1980 and 1990 surveys. No information is available on encyclopedia of life [web subsequent or planned surveys. If these populations still exist, they are considered application]. 2001. Version 1.6 . rare in R2. Arlington, Virginia, USA: http://www.natureserve.org/explore Confidence in Rank Medium r. (Accessed: October 3, 2002) Little information is available on distribution of T. ovatum outside R2. It is reported from • IBID 2 B CA, ID, MT, OR, and WA. No additional information is available. This species is Distribution outside R2 ranked B based on its limited distribution outside R2. Confidence in Rank: Medium Like all lilies, T. ovatum grows from underground bulbs The plant also reproduces • IBID 3 A through seeds. One report indicates T. ovatum seeds are seldom dispersed more than Dispersal • Mesler and Lu, 1983. Trillium seed Capability one meter. No detailed information is available for dispersal capability, however based dispersal. Amer. Journ. Bot., Vol. on isolated populations and likely limited dispersal capability, it is ranked A. 70, pp 1460-1465. Confidence in Rank: Medium No information is available on abundance of this species in R2. However, based on • IBID 4 A few populations with limited distribution, T. ovatum is ranked A. Abundance in R2 Confidence in Rank Medium USDA-Forest Service R2 Sensitive Species Evaluation Form Page 1 of 3 ATTACHMENT SS2 Species: Trillium ovatum/Western Wake-robin, Western Trillium Criteria Rank Rationale Literature Citations 5 D No information is available on population trends for this species. • IBID Population Confidence in Rank Low Trend in R2 No detailed information is available on habitat for this species. Therefore, habitat • IBID 6 D trends cannot be determined. Habitat Trend in R2 Confidence in Rank Medium In 1987, it was reported that this species was threatened from over collection for • IBID 7 A gardens. Some populations are in close proximity to trails and may be vulnerable to Habitat Vulnerability easy collection. Another report indicates logging and sheep grazing potentially or threaten this species. Since this species has a potential for threats, it is ranked A. Modification Confidence in Rank Medium Information on life history, ecology, and demography are included in Sections 1-7 of • IBID 8 D this evaluation. However, no information is available on reproductive rates or mortality Life History and of this species. Demographics Initial Evaluator(s): Date: 10/04/02 Janice P. McKee, Botanist National Forests in the Rocky Mountain Region where species is KNOWN (K) or LIKELY(L)1 to occur: 1 Likely is defined as more likely to occur than not occur on the National Forest or Grassland. This generally can be thought of as having a 50% chance or greater of appearing on NFS lands. USDA-Forest Service R2 Sensitive Species Evaluation Form Page 2 of 3 ATTACHMENT SS2 Colorado NF/NG Kansas NF/NG Nebraska NF/NG South Dakota Wyoming NF/NG NF/NG y y y y y Known Likel Known Likel Known Likel Known Likel Known Likel Arapaho-Roosevelt NF Cimmaron NG Samuel R.McKelvie NF Black Hills NF Shoshone NF White River NF Halsey NF Buffalo Gap NG Bighorn NF Routt NF X Nebraska NF Ft. Pierre NG Black Hills NF Grand Mesa, Ogalala NG Medicine Bow NF X Uncompahgre, Gunnison NF San Juan NF Thunder Basin NG Rio Grande NF Pike-San Isabel NF Comanche NG USDA-Forest Service R2 Sensitive Species Evaluation Form Page 3 of 3 .