ATTACHMENT SS2

REGION 2 SENSITIVE SPECIES EVALUATION FORM

Species: Evax prolifera Nutt. ex DC. big-head rabbitt-tobacco SYNONYMS: Diaperia prolifera (Nutt. ex DC.) Nutt. [Rydberg 1932]; nuttallii Shinners

Criteria Rank Rationale Literature Citations • Anderson 1950 • Barkley 1991 Rare in se (Natrona and Platte Cos) WY; thence n and e to the sw ¼ of SD; thence s through the panhandle • Freeman in prep. of NE, and the w ½ of KS (and Cowley and Sedgwick Cos in e KS); thence w through the e ½ of CO. Not 1 cited by Hartman for WY. [Vouchers at KANU from Boulder, Kit Carson, Logan, and Yuma Cos, CO; 22 cos • Flora Association 1977 • Hartman 1997 Distribution B in KS; and Dundy and Sioux Cos, NE.] within R2 Status: G5; WY S1. • Hazlett 1998 Confidence in Rank High or Medium or Low • Shaw et al. 1989 • Weber 1995 • Weber & Wittman 2001 se WY, n and e into sw SD; thence s through the panhandle of NE, the w ½ of KS, the e 2/3 of OK, and central and w TX; thence w into e and n NM, and n into e CO. • Correll & Johnston 1979 2 • Freeman in prep. Distribution B • Great Plains Flora Association 1977 outside R2 • Martin & Hutchins 1980 Confidence in Rank High or Medium or Low Evaluator was unable to find any information about species’ dispersal capability. Species is likely dispersed by a combination of vectors, including wind, and vertebrate- and invertebrate animals. C.C. Freeman (pers. 3 comm.) suggests species may also be dispersed to some degree via water during heavy rains. At any rate,

Dispersal B seed is probably not dispersed over great distances and species is limited to some degee by habitat Capability requirements. Confidence in Rank High or Medium or Low Species appears to be secure, at least throughout s-central R2 where it is widely distributed and locally common. 4

Abundance in C R2 Confidence in Rank High or Medium or Low Evaluator was unable to find any information about populations trends within R2. Species is disturbence dependent and populations appear to persist in pasturelands, however. 5

Population B Trend in R2 Confidence in Rank High or Medium or Low Observation of herbarium specimen labels at KANU reveals that species occupies an array of habitats, but is often reported from barren or disturbed areas in shortgrass prairie; on sandstone-, limestone-, clay-, and 6 gypsiferous soils. Weber & Wittman report species as “a nondescript little weed of disturbed and overgrazed • Weber & Wittman 2001 Habitat Trend B/C places on the plains [of CO].” I suspect that there are stable or increasing amounts of suitable habitat, at in R2 least throughout s-central R2. Confidence in Rank High or Medium or Low

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Species: Evax prolifera Nutt. ex DC. big-head rabbitt-tobacco SYNONYMS: Diaperia prolifera (Nutt. ex DC.) Nutt. [Rydberg 1932]; Filago nuttallii Shinners

Criteria Rank Rationale Literature Citations Species is an early successional species, reported from barren microsites. Evaluator has observed it in 7 abundance in grazed and otherwise disturbed sites in OK. Habitat is likely resilient to, or benefits from, Habitat moderate amounts of disturbance.

Vulnerability C or Modification Confidence in Rank High or Medium or Low Annual forb. Flowering and fruiting mid May through mid July. Species is often locally abundant where encountered and probably exhibits a rather high reproductive rate. Evaluator was unable to find any other 8 information about species’ life history. Life History B and Demographics Confidence in Rank High or Medium or Low Evaluator: Caleb A. Morse, R.L. McGregor Herbarium (KANU), University of Campus West, 2045 Constant Ave, Lawrence KS 66047 Date: 01/16/02

National Forests in the Rocky Mountain Region where species is KNOWN (K) or LIKELY (L)1 to occur:

South Dakota NF/NG Kansas NF/NG NF/NG NF/NG NF/NG Likely Likely Likely Likely Likely Known Known Known Known Known

Arapaho-Roosevelt Samuel R.McKelvie X Cimmaron NG X3 Black Hills NF X Shoshone NF NF NF White River NF Halsey NF Buffalo Gap NG X Bighorn NF Routt NF Nebraska NF X Ft. Pierre NG Black Hills NF Grand Mesa, Uncompahgre, Ogalala NG X4 Medicine Bow NF Gunnison NF San Juan NF Thunder Basin NG X? Rio Grande NF Pawnee NG X2 Pike-San Isabel NF X Comanche NG X 2 Voucher cited in Hazlett (1998). 3 KANU catalog # 28867: KS, Morton Co: 9 mi N, 3 mi W Elkhart, breaks of Cimarron River, 7 Jun 1961, E.L. Richards 2558; KANU catalog # 102160: KS, Morton Co: ca 6.5 mi N, 5 mi W Elkhart, Cimarron NG, T34S R43W S10 NW¼ NW¼ SW¼, FR 663, Elev 3530 – 3540 ft, 1 Jun 1989, C.C. Freeman 2995.

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.

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4 KANU catalog # 116529: NE, Sioux Co: Toadstool Park, Oglala NG, T33N R53W S5 SE¼ SE¼, 6 Jul 1995, S.B. Rolfsmeier 11738; KANU catalog # 133996: NE, Sioux Co: ca 15 mi NW Crawford, Toadstool Park, N side of upper reaches of Big Cottonwood Creek, T33N R53W S4 & S5, 16 Jul 1991, C.C. Freeman 3909; KANU catalog # 323310: NE, Sioux Co: Oglala NG, Pasture 45, T34N R54W S11 W½, 9 Jul 1998, S.B. Rolfsmeier 14071, G. Steinauer & T. Hildebrand.

REFERENCES

Anderson, J.M. 1950. Annotated List of the Vascular Flora of Baca County, Colorado. M.A. Thesis, University of Colorado. 39 pp. Barkley, T.M. 1991. , pp. 838–1021 in Great Plains Flora Association, Flora of the Great Plains. University Press of Kansas. Lawrence, Kansas. vii + 1402 pp. Correll, D.S. and M.C. Johnston. 1979. Manual of the Vascular of . University of Texas at Dallas. Richardson, Texas. xv + 1881 pp. Freeman, C.C. (in prep.) Checklist of the Vascular Plants of the Grassland Biome of Central North America. Great Plains Flora Association. 1977. Atlas of the Flora of the Great Plains. Iowa State University Press. Ames, Iowa. xii + 600 pp. Hartman, R.L. 1997. Atlas of the Vascular Plants of Wyoming. Published by the author at Rocky Mountain Herbarium, University of Wyoming. Laramie, Wyoming. [unpaginated] Hazlett, D.L. 1998. Vascular species of the Pawnee National Grassland. General Technical Report RMRS-GTR-17. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. Fort Collins, Colorado. 26 pp. Martin, W.C. and C.R. Hutchins. 1980. A Flora of . J. Cramer. Vaduz, Germany. xiii + 2591 pp. Rydberg, P.A. 1932. Flora of the Prairies and Plains of Central North America. New York Botanical Garden. New York, New York. vii + 969 pp. Shaw, R.B., S.L. Anderson, K.A. Schulz and V.E. Diersin. 1989. Floral inventory for the USA army pinon canyon maneuver site, Colorado (USA). Phytologia 67: 1–42. Weber, W.A. 1995. Checklist of the vascular plants of Boulder County, Colorado. Nat. Hist. Invent. Colorado 16: 1–66. Weber, W.A. and R.C. Wittman. 2001. Colorado Flora: Eastern Slope (3rd Edition). University Press of Colorado. Boulder, Colorado. xl + 521 pp.

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