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The Arkansas Endemic Biota: An Update with Additions and Deletions H. Robison1, C. McAllister2, C. Carlton3, and G. Tucker4 1Department of Biological Sciences, Southern Arkansas University, Magnolia, AR 71754-9354 2RapidWrite, 102 Brown Street, Hot Springs National Park, AR 71913 3Department of Entomology, Louisiana State University, Baton Rouge, LA 70803-1710 4FTN Associates, Ltd., 3 Innwood Circle, Suite 220, Little Rock, AR 72211 1Correspondence: [email protected] Abstract Pringle and Witsell (2005) described this new species of rose-gentian from Saline County glades. It It has been over a decade since the publication of occurs on shale glades (on Womble Shale of Middle Robison and Allen (1995) that provided the definitive Ordovician age) in the eastern Ouachita Mountains and list of endemic flora and fauna of Arkansas. The on nepheline syenite glades (igneous intrusions of Late present study brings up-to-date the endemic biota of Cretaceous age) in the Upper West Gulf Coastal Plain the state. Since 1995, several new species have been of Saline County. described and new discoveries have been made, adding species to the state biota. Other species are deleted and Order Asterales new distributional information on other state endemics Family Asteraceae is presented. Specifically, 3 new plant species are Liatris compacta (Torr. & Gray) Rydb. 1931 – Blazing added to the state list while 4 plant species are deleted. Star Sixteen new animal species/subspecies are added to the This blazing star is endemic to a portion of the state list while numerous species are deleted. These Ouachita Mountains in Arkansas and is thus added to changes bring to 110 (10 species of plants and 100 the state list of endemics species/subspecies of animals) the total number of (http://efloras.org/florataxon.aspx?flora_id=1&taxon_i Arkansas state endemic plants and animals presently d=250067095) [Flora North America, Vol. 21, p. 517] known, which represents a decrease by 7 species from (http://www.naturalheritage.com/program/rare- the 117 species reported in 1995. species/federally-listed/plant-profiles/blazing_star.asp). Introduction Order Brassicales Family Brassicaceae Robison and Allen (1995) published the definitive Streptanthus maculatus Hook ssp. obtusifolius (Hook.) list of endemic plants and animals of Arkansas. Since it Rollins 1959 – Clasping Twistflower has been over a decade since the appearance of This twistflower is added to the Arkansas list of Robison and Allen (1995), it seems entirely endemic plants. It is known from Faulkner, Garland, appropriate to bring up-to-date the endemic biota of the Hot Spring, Howard, Montgomery, Polk, Pulaski, and state. New species have been described and new Saline counties. Streptanthus obtusifolius was formerly discoveries have been made, adding species to the state (Kartesz 1994) considered within the range of biota. Additional discoveries require deletions of variability for S. maculatus but Kartesz and Meacham several species previously believed to be state (1999) subsequently recognized it as a subspecies. endemics. In this publication, we bring up-to-date the Recent authors have followed the Kartesz lead. state endemic biota, including new species additions, species requiring deletion, and adding distributional Deletions from State Endemic Flora information on other state endemics. Order Jungermanniales Family Lejeuneaceae PLANTS Plagiochila japonica Sande Lac. ex Miquel subspecies ciliigera 1959 – Liverwort Additions to State Endemic Flora The liverwort Plagiochila japonica and the Order Gentianales subspecies P. japonica subsp. ciliigera are not Family Gentianaceae currently considered to be separate from P. sciophila Sabatia arkansana Pringle and Witsell 2005 – Pelton’s Nees ex Lindeb. P. sciophila is widespread in Asia and Rose-gentian in North America is known from the Blue Ridge in the Journal of the Arkansas Academy of Science, Vol. 62, 2008 84 The Arkansas Endemic Biota: An Update with Additions and Deletions Southern Appalachians, the Cumberland Plateau, and a New Distributional Information single location in the Ozark Mountains. Heinrichs et al. Order Ranunculales (2004) summarized the results of their morphological, Family Ranunculaceae molecular, and chemical work and presented an Delphinium newtonianum D. M. Moore 1939 – updated section and species list for Plagiochila. They Moore’s Delphinium noted that Plagiochila is notorious for variation in This state endemic has now been documented from gametophytic characters, especially leaf shape and 8 counties including Johnson, Montgomery, Newton, dentation. Pike, Polk, Pope, Searcy, and Van Buren (ANHC database; http://www.naturalheritage.com/program/ Order Caryophyllales inventory.asp). Family Caryophyllaceae Arenaria muriculata Maguire 1951 – Sandwort Order Rosales Arenaria muriculata has been lumped (along with Family Rosaceae several other taxa) as a synonym under A. muscorum Mespilus canescens Phipps 1990 – Stern’s Medlar (Fassett) Shinners. This group is now treated in the Phipps (1990) described this species from Slovak in genus Minuartia (see Flora of North America website Prairie County as the only American species of its at http://hua.huh.harvard.edu/FNA/; Arkansas Vascular genus. Prior to the discovery of Stern’s Medlar, the Flora Committee 2006). Before the merger, Arenaria genus Mespilus was comprised of a single species muriculata had been found in Texas, so regardless of native to western Eurasia but cultivated far beyond that how it is treated, it is no longer endemic only to area for its edible fruit and known as medlar. The Arkansas. closely related genus Crataegus, on the other hand, was known to include 140-200 or more species of Order Cyperales hawthorns throughout the northern hemisphere. A Family Cyperaceae recent paper by Lo et al. (2007), however, provides Carex opaca (F. J. Hermann) P. E. Rothrock & strong documentation to support a hybrid origin for Reznicek 1972 – Sedge Stern’s Medlar. On the basis of comparative molecular This sedge has been elevated to full species rank as studies, the authors (Lo et al. 2007) propose a hybrid Carex opaca (F. J. Herm.) by Rothrock and Reznicek origin from our native species Crataegus (2001). It is now known from several other states and brachyacantha and the Eurasian Mespilus germanica. should be omitted from the list of state endemics. A They further propose that the species should be known distribution map for this species can be seen at the as Crataegus X canescens (J. B. Phipps) T. A. following site: (http://www.efloras.org/ Dickinson and E. Y. Y. Lo. object_page.aspx?object_id=9479&flora_id=1) A hybrid origin for Stern’s Medlar presupposes that a cultivated specimen of medlar came into contact with Order Brassicales a native plant of Crataegus brachyacantha, the Family Brassicaceae blueberry hawthorn. The blueberry hawthorn is known Cardamine angustata var. ouachitana E. B. Smith from several Arkansas counties in the Delta and 1982 – Toothwort Coastal Plain regions, but has not been reported from The recently published Checklist of the Vascular Prairie County, the only known locality for Stern’s Plants of Arkansas (Arkansas Vascular Flora Medlar. The Slovak area was home to Czechs and Committee 2006) merges this variety into synonymy other settlers having an Eastern European origin. with the species. Also, the online database known as Although seldom seen today, medlar fruits were much ITIS (Integrated Taxonomic Information System; prized in the past and much planted throughout Europe. http://www.itis.gov/) does not accept this variety but Cultivation of medlar by one or more of these early considers it within the range of variation for the settlers is not unexpected. species. Similarly, the online database known as MorphoBank (http://morphobank.geongrid.org/) does Order Fagales not recognize this taxon. For these reasons, Cardamine Family Fagaceae angustata var. ouachitana E.B. Smith is deleted from Quercus shumardi Buckl. var. acerifolia E. J. Palmer the list of state endemic plants. 1926 – Maple-Leaved Oak A recently published volume of Flora North America [Volume 3] elevated this taxon to the rank of full species, i.e. Quercus acerifolia (E. J. Palmer) N. A. Journal of the Arkansas Academy of Science, Vol. 62, 2008 85 H. Robison, C. McAllister, C. Carlton, and G. Tucker Stoynoff & W. J. Hess based upon Stoynoff and Hess as G1 and is considered critically imperiled (1990) (http://www.efloras.org/florataxon.aspx? (NatureServe 2008). flora_id=1&taxon_id=233501004). Later, Hess and Stoynoff (1998) completed a morphological ANIMALS comparison of 4 members of the Quercus shumardii complex. Additions to State Endemic Fauna The maple-leaved oak was believed to be endemic Order Amphipoda (scuds, sideswimmers) to Magazine Mountain, Logan County, in the Arkansas Family Crangonyctidae River Valley province (Robison and Allen 1988) Crangonyx aka Zhang and Holsinger 2003 until 1991. Johnson (1992) extended the known Described by Zhang and Holsinger (2003) from an distribution to Pryor Mountain, Montgomery County, unmarked stream in Pope County, ca. 0.5 mi (0.8 km) and Sugarloaf Mountain, Sebastian County. In 1993 an south of Hector on St. Hwy. 27 (USNM 230406 – additional population was discovered on Porter Holotype. R. Fox. 28 Dec 1970). Mountain, Polk County, bringing the total known populations to 4 (Rouw and Johnson 1994). Bacturus speleopolis Holsinger, Sawicki, and Graening 2006 Order Boraginales Holsinger et al. (2006) described Bacturus Family Hydrophyllaceae speleopolis,
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