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Annotated Checklist of Exotic Vascular Plants in Yellowstone National Park

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Annotated Checklist of Exotic Vascular Plants in Yellowstone National Park Western North American Naturalist Volume 61 Number 3 Article 10 7-27-2001 Annotated checklist of exotic vascular plants in Yellowstone National Park Jennifer J. Whipple National Park Service, Yellowstone National Park, Wyoming Follow this and additional works at: https://scholarsarchive.byu.edu/wnan Recommended Citation Whipple, Jennifer J. (2001) "Annotated checklist of exotic vascular plants in Yellowstone National Park," Western North American Naturalist: Vol. 61 : No. 3 , Article 10. Available at: https://scholarsarchive.byu.edu/wnan/vol61/iss3/10 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Western North American Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Western North American Naturalist 61(3), © 2001, pp. 336–346 ANNOTATED CHECKLIST OF EXOTIC VASCULAR PLANTS IN YELLOWSTONE NATIONAL PARK Jennifer J. Whipple1 ABSTRACT.—Documentation of the arrival of exotic vascular plants in Yellowstone National Park has been sporadic. An annotated checklist of exotic vascular plants is presented, with information about the approximate arrival time in the park of each species and the current extent of the infestation. Yellowstone’s flora includes 187 exotic vascular plant species (14.8% of the flora), and the park has an extrapolated mean number of exotic species per 10 km2 of 47.3. The sit- uation in Yellowstone is compared with other areas in North America. The increase in exotics mirrors a corresponding increase in visitation. Key words: Yellowstone National Park, exotic plants, flora, vascular plants, annotated checklist. The intense interest generated by the expe- exotic species in the park by 1900. Other collec- ditions of Folsom and Cook in 1869 and Lang- tions, such as many of those cited by Tweedy ford, Washburn, and Doane in 1870 led to the and Rydberg, are at East Coast herbariums establishment of Yellowstone as the 1st national such as the New York Botanical Gardens (NY) park in the world in 1872. The 1st botanical and the Smithsonian Institution (US) and there- collection was by Robert Adams, Jr., who was fore were not easily available for examination. a member of the 1871 Hayden expedition. The A significant interval has passed since the earliest known record of an exotic species in last flora was published for Yellowstone National Yellowstone is Oxalis violacea Jacq., which was Park (Despain 1975). In the intervening time collected by Forwood in 1881 (Denton 1973). exotics have continued to arrive and spread in The 1st Yellowstone flora was published by Yellowstone. The purpose of this paper is to Frank Tweedy (1886), who incorporated the provide an updated annotated checklist of work of several collectors and listed 657 species, exotics known to occur within the park. including 6 species that, if correctly identified, Precise demarcation of exotic species can are exotic. Thus, a relatively early baseline of be difficult. A species is considered exotic by information exists that predates most major the National Park Service if it occurs in a disturbance by visitors. In 1900, Per Axel Ryd- given place as a result of direct or indirect, berg completed a catalogue of the vascular deliberate, or accidental actions by humans plants of Montana and Yellowstone National (NPS 1988). Species that are native to North Park and reported 8 species that appear to be America, but would not be found within the exotic, including 4 that were reported by confines of the park without human interven- Tweedy. These early floras did not include all tion, are therefore considered exotic. collections that had been made within Yellow- During the early years of the park, several stone, omitting, for example, the Forwood col- species including Syringa vulgaris L., Picea lection of Oxalis violacea. Intense interest in pungens Engelm., and Populus spp. were inten- the park resulted in many other collectors vis- tionally planted in Mammoth and at other iting and making extensive collections that are locations in the park. The annotated checklist now scattered among many different institu- of exotic plants does not include any species tions. Examination of material at Yellowstone that was intentionally planted if the original National Park (YELLO), Montana State Uni- plant has not reproduced or spread from the versity (MONT), and Rocky Mountain Herb- historical planting. Because one goal of the arium (RM) resulted in the location of speci- National Park Service is to prevent the estab- mens documenting the presence of at least 12 lishment of exotic species, any new arrival is 1National Park Service, PO Box 168, Yellowstone National Park, WY 82190. 336 2001] YELLOWSTONE PARK’S EXOTIC FLORA 337 eradicated if possible. Therefore, some species many parts of the United States (Rejmánek that might not persist and reproduce within the and Randall 1994, Sheley et al. 1999). The re- confines of the park are included in this list. mainder are from North America (5.3%) and The origins of several cosmopolitan weeds Central and South America (1.1%). that occur in Yellowstone, such as Amaranthus Because the incidence and spread of exotics retroflexus L., Poa pratensis L., Polygonum avic- is escalating, more interest is focused on the ulare L., and Rorippa nasturtium-aquaticum magnitude of the problem. Several methods (L.) Hayek, have spawned intense debate in have been used to present information about the literature and may never be satisfactorily the presence of exotics in a flora. The total resolved (Cronquist et al. 1977, Stuckey and number of exotic taxa, of interest in itself, pro- Barkley 1993, Rejmánek and Randall 1994). vides no way to compare diverse areas, espe- The decision to include Amaranthus retroflexus, cially when the areas to be contrasted are of Poa pratensis, Polygonum aviculare, and Ror- significantly different size. Another commonly ippa nasturtium-aquaticum as exotic species to used comparison is the percentage of the flora Yellowstone is somewhat arbitrary, yet gener- that is exotic. This method has some of the ally consistent with records of the earliest col- same problems as the number of exotic species. lections in the park. In addition, the percentage can be highly in- Documentation of the arrival of exotics has fluenced by the relative diversity of the flora, been somewhat sporadic through the years. allowing comparable-sized areas with the The first 50 years after the park’s establish- same number of exotics to have very different ment was a time of intense collecting, but percentages. Rejmánek and Randall (1994) used interest in and documentation of exotics var- the number of species ⋅ log(area)–1 as a stan- ied from collector to collector. P.H. Hawkins dardized expression of exotic species richness. and H.S. Conard in the 1920s collected exten- When used with log to the base 10, this index sively in the park and documented many exotics corresponds to the extrapolated mean number for the 1st time. Interest in documenting exotic of exotic species ⋅ 10 km–2. The high number of species presence in the park then dwindled exotics centered near developed areas, roads, until the early 1950s, when Ray Davis docu- and trails in Yellowstone skews this result. The mented the presence of an additional 28 likelihood of finding a particular 10-km2 plot species. The arrival of plant ecologist Don with this exact number of exotics is low. Even Despain in Yellowstone in 1972 renewed inter- with these difficulties, this method allows est in the flora of the park and resulted in pub- comparison among areas of greatly different lication of a flora reporting 86 exotics (Despain sizes and native flora richness (Table 1). The 1975). Additional new records of exotics were infestation of exotics is greater than might be documented during habitat mapping of the expected in Yellowstone, given that most of the entire park during the late 1970s. Yellowstone’s park is de facto wilderness and has not been Exotic Vegetation Management Plan (NPS logged, farmed, or grazed by domestic stock. 1986) listed 89 species of exotics but failed to Most exotic vascular plants currently known mention several species reported in Despain from within Yellowstone National Park are also (1975). The intensification of interest and widespread in adjacent states. Yellowstone, alarm about the spread of exotics has resulted though, is a destination for visitors from in a determined effort by the National Park throughout the United States and the world. Service to document all exotics present in the The 1st report of an exotic for the state of park and eradicate new arrivals, if possible, Wyoming has not infrequently been from Yel- before they become established (Olliff et al. lowstone National Park. The annotated check- 2001). Currently, 187 species of exotics (188 list includes 11 species not reported by the taxa) are known to occur or have occurred in most recent flora of Wyoming (Dorn 1992): the past within the confines of the park, and Centaurea × pratensis, Cerastium glomeratum, new taxa are located almost every year. Hieracium caespitosum, H. flagellare, H. flori- Even though visitors come from all over the bundum, Holosteum umbellatum, Prunus avium, world to visit Yellowstone, origins of the exotic Senecio jacobaea, Trifolium aureum, T. cam- species do not reflect this wide diversity. The pestre, Vicia cracca. primary source of exotics is Eurasia, represent- The escalating number of exotics mirrors ing 93.6% of the exotic flora, as is typical in the steadily increasing visitation to the park 338 WESTERN NORTH AMERICAN NATURALIST [Volume 61 TABLE 1. Species richness of exotic vascular plant floras at selected locations in the United States. Number of Number of Percentage of Number of exotic Region native species exotic species exotic species species per log(area) Alaska1 1229 144 10.5 23.3 California1 4844 1025 17.5 182.6 Glacier N.
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