ï~~2001
THE MICHIGAN BOTANIST
105
Great Lakes Alkaline Rockshore and Alvar (Table 9)
Creviced, coastal, horizontal exposures of dolomite feature some of the richest, most floristically distinct, and aesthetically pleasing plant communities in
the Grand Traverse Islands. These Great Lakes alkaline rockshores (Wisconsin
Department of Natural Resources 1999) are influenced by wave-splash, icepush, and the fluctuating levels of Lake Michigan. White cedar is almost always
the dominant shoreline tree, and common associated shrubs are ninebark (Physocarpus opulifolius), red-osier dogwood (Cornus stolonifera), shrubby St. John'sTABLE 9. Characteristic species of Great Lakes alkaline rockshores and alvars on the Grand Traverse Islands (*-found only on the Michigan islands).
Agalinis purpurea
Anemone virginiana
Aquilegia canadensis
Arabis hirsuta
Argentina anserina
Aster ciliolatus
A. pilosus var. pringlei
Calamagrostis inexpansa subsp. stricta
Calamintha arkansana
Campanula rotundifolia
Carex aquatilis
C. aurea
C. buxbaumii
C. capillaris*
C. castanea
C. concinna
C. crawei
C. eburnea
C. flava
C. garberi
C. granularis
C. hystericina
C. richardsonii *
C. sterilis
C. viridula
Castilleja coccinea
Cicuta bulbifera
Comandra umbellata
Cornus stolonifera
Deschampsia cespitosa
Eleocharis elliptica
E. quinqueflora
Equisetum arvense
E. variegatum
Eupatorium perfoliatum
Euthamia graminifolia
Fragaria virginiana
Gentianopsis procera
Geum aleppicum
Hieracium kalmii
Houstonia longifolia*
Hypericum kalmianum
Iris lacustris
Juncus alpinoarticultus
J. arcticus subsp. littoralis
J. brevicaudatus
Juniperus communis var. depressa
J. horizontalis
Larix laricina
Lathyrus palustris
Lilium philadelphicum
Lobelia kalmii
Lycopus americanus
Lysimachia quadriflora
Osmuda regalis var. spectabilis
Packera paupercula
Panicum acuminatum (and varieties)
Parnassia parviflora
Pentaphylloides floribunda
Physocarpus opulifolius
Polygala senega
Populus balsamifera
Primula mistassinica
Prunella vulgaris
Rhynchospora capillacea
Rosa acicularis subsp. sayi
Rudbeckia hirta
Selaginella eclipes
Shepherdia canadensis
Sisyrinchium montanum
Smilacina stellata
Solidago juncea
S. ohioensis
Sphenopholis intermedia
Symphoricarpos albus
Thalictrum dioicum
Thelypteris palustris var. pubescens
Thuja occidentalis
Tofieldia glutinosa
Triglochin palustre
Vicia americana
Viola adunca
V nephrophylla
Zigadenus elegans subsp. glaucus
