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Page 214 ï~~214 THE MICHIGAN BOTANIST Vol. 45 NOTEWORTHY COLLECTION WISCONSIN RUELLIA HUMILIS Nuttall (Acanthaceae). Fringe-leaf ruellia, hairy ruellia, hairy wild petunia, wild petunia. Previous knowledge. In Wisconsin Ruellia humilis is a rare and endangered prairie species adapted to periodic fires and vegetation disturbances on open dry sandy ground and limestone/dolomite outcrops (WDNR, 2004). The distribution of R. humilis in Wisconsin is documented for one central county (Portage) (Wisflora, 2006), two northeastern counties (Outagamie, Winnebago) (Eddy 2005) and five counties in the two southernmost-tiers of the state (Crawford, Dane, Grant, Rock, Walworth) (Wisflora, 2006). Significance of the report. A recent collection of R. humilis in Green Lake County narrows the distance of known populations between the southern and the central/northeastern counties of the state. On 22 July 2006 a small population was discovered growing on a dry prairie remnant in the WDNR White River Marsh Wildlife Area nine miles west of the city of Berlin off the west side of County Trunk E (NW 1/4 SE 1/4 Section 2, T17N, R11E). GPS latitude/longitude coordinates for the site are N43Â~58.159' W089009.114' at 812 feet above sea level. Groundcover at the Ruellia site varies from exposed dry sand with a broken crust of lichens (Cladonia) to interspersed patches of smooth brome and sheep fescue. The likelihood of R. humilis seed having been deliberately introduced during a restoration planting is nil-historically no such plantings are known to have occurred at this location (Jim Holzwart, WDNR Wildlife Biologist, personal communication, 31 July 2006). Associates of R. humilis at the Green Lake County site include: Achillea millefolium, Antennaria neglecta, Aristida oligantha, Asclepias amplexicaulis, A. syriaca, A. tuberosa, A. verticillata, Baptisia bracteata var. glabrescens, Carex pensylvanica, Cyperus filiculmis, C. schweinitzii, Eragrostis capillaries, Euphorbia corollata, Gnaphalium obtusifolium, Hieracium longipilum, Koeleria pyramidata, Krigia virginica, Lespedeza capitata, Liatris aspera, Lithospermum canescens, Lupinus perennis, Monarda fistulosa, Oenothera perennis, Panicum commonsianum var. euchlamydeum, Penstemon grandiflorus (county record), Physalis longifolia, Rosa blanda, Rubus flagellaris, Schizachyrium scoparium, Solidago nemoralis, Tradescantia ohioensis and Verbena stricta. Woody plants include Juniperus virginiana, Quercus ellipsoidalis, Q. velutina, Pinus strobus and Prunus serotina, while noted weeds are Bromus inermis, Conyza canadensis, Festuca ovina, Hieracium aurantiacum, Mollugo verticillata, Rumex acetosella, Silene vulgaris, Tragopogon dubius and Verbascum thapsus. Diagnostic characters. R. humilis flowers near the end of June to midSeptember and is in fruit from the end of July through September. The blue
Page 215 ï~~2006 THE MICHIGAN BOTANIST 215 lavender inflorescence appears both singly or in clusters of the upper leaf axils. Petals are 3-7 centimeters long, united into a long funnel-like tube with spreading lobes. Dark stripes appear at the base of the corolla lobes, presumably to guide pollinators. Four stamens are joined near the base in pairs, along with a single staminodium that is frequently present. The fruit of R. humilis is a slightly flattened, two-chambered capsule that contains three to eight seeds per chamber. Specimen citations. PORTAGE CO.: Freckman 27207, 1993, UWSP; OUTAGAMIE CO.: Hans s.n., 2003, OSH; WINNEBAGO CO.: Harriman and Lammers s.n. 2005, OSH; CRAWFORD CO.: Eldred 92-87, 1992, WIS; Walz & Walz, s.n., 1990, WIS; Goessl s.n., 1921, WIS; DANE CO.: Zimmerman s.n., 1995, WIS; GRANT CO.: Sime 9705, 1997, WIS; Sime 98-06, 1998, WI; WALWORTH CO.: Aust s.n., 1940, WI; ROCK CO.: Baller s.n., 1987, UWSP; Moran s.n., 1975, WIS; Lathrop s.n., no date, WIS; McElhenny s.n., no date, WIS; Lapham s.n., no date, WIS; Hale s.n., no date, WIS; Swezey, s.n., 1875, WIS; Hale s.n., no date, WIS; Wadmond, s.n., 1931, WIS. LITERATURE CITED Eddy, Thomas L. 2005. New Records for Ruellia humilis (Acanthaceae) in Wisconsin. The Michigan Botanist. 44(4)196-197. Gleason, H. A. & A. Cronquist. (1991). Manual of Vascular Plants of Northeastern United States and Adjacent Canada. New York Botanical Garden, Bronx, NY. Wisconsin Department of Natural Resources. (2004). The natural heritage inventory working list: rare vascular plants. Retrieved 13 August 2005, from Wisconsin Natural Heritage Inventory Web site: http://www.dnr.state.wi.us/org/land/er/working_list/ taxalists/plants.htm. Wisflora: Wisconsin vascular plant species. (2006). Retrieved 30 July 2006, from Wisflora: Wisconsin Vascular Plant Species Web site: http://www.botany.wisc.edu/wisflora/. Thomas L. Eddy 426 Walker Avenue Green Lake, WI 54941