64 Bulletin 1, Biological Society of Washington, 1918. 



SELECTED SPECIES OF THE WASHINGTON FLORA THAT 



APPARENTLY ARE RESTRICTED TO THE 



PIEDMONT PLATEAU. 



Osmunda claytoniana 

 Pteretis nodulosa 

 Woodsia obtusa 

 Filix bulbifera 

 Dryopteris clintoniana 



goldiana 



hexagonoptera 



marginal is 

 Camptosorus rhizophyllus 

 Asplenium pinnatifidum 



trichomanes 



montanum 

 Athyrium thelypteroides 

 Pellaea atropurpurea (in natural 



situations) 

 Cheilanthes lanosa 

 Selaginella rupestris 

 Isoetes engelmannii valida 

 Pinus strobus 



pungens 

 Tsuga canadensis 

 Panicum gattingeri 



linearifolium 



xalapense 



annulum 



latifolium 

 Muhlenbergia sobolifera 



schreberi 

 Brachyelytrum erectum 

 Eragrostis hypnoides 



caplllaris 



frankii 

 Melica mutica 

 Uniola latifolia 

 Festuca obtusa 

 Bromus purgans incanus 

 Elymus striatus 

 Hystrix hystrix 

 Hemicarpha micrantha 

 Fimbristylis baldwiniana 

 Scirpus planifolius 



lineatus 



Carex nigro-marginata 



jamesii 



frankii 



davisi 



albursina 



hirtifolia 



careyana 



platyphylla 



oligocarpa 



hitchcockiana 



torta 

 Arisaema dracontium 

 Commelina erecta 

 Melanthium latifolium 

 Allium tricoccum 



cernuum 

 Erythronium albidum 

 Lilium philadelphicum 

 Vagnera stellata 

 Trillium sessile 



grandiflorum 

 Iris cristata 

 Sisyrinchium intermedium 



mucronatum 

 Cypripedium parviflorum 

 Blephariglottis peramoena 

 Triphora trianthorphora 

 Liparis loesellii 

 Corallorhiza wisteriana 

 Betula lenta 

 Populus virginiana 

 Quercus acuminata 



leana 

 Hicoria cordiformis 



microcarpa 



ovata 

 Ostrya virginiana 

 Celtis crassifolia 

 Cerastium oblongifolium 

 Silene alba 

 Delphinium tricorne 

 Aconitum uncinatum 

 Anemone virginiana 



