. The Canadian field-naturalist. 574 The Canadian Field-Naturalist Vol. 113 UPGMA CLUSTERING FOR GEOGRAPHIC DATA SHOWING RELATIONSHIPS OF 57 ONTARIO ALVARS. Napanee Plain Northeast Napanee Plain Southwest Trent Bay Smiths Falls Plain Garden Plain Cape Croker Upper Bruce Peninsula La Cloche Manitoulin Island Figure 4. UPGMA clustering of 57 alvars from the contact line region of southern Ontario based on Average Taxonomic Distance coefficients from latitude and longitude data. The cophenetic correlation was in having fewer sites with Carolina Crane's-bill (Geranium carolinianum L
. The Canadian field-naturalist. 574 The Canadian Field-Naturalist Vol. 113 UPGMA CLUSTERING FOR GEOGRAPHIC DATA SHOWING RELATIONSHIPS OF 57 ONTARIO ALVARS. Napanee Plain Northeast Napanee Plain Southwest Trent Bay Smiths Falls Plain Garden Plain Cape Croker Upper Bruce Peninsula La Cloche Manitoulin Island Figure 4. UPGMA clustering of 57 alvars from the contact line region of southern Ontario based on Average Taxonomic Distance coefficients from latitude and longitude data. The cophenetic correlation was in having fewer sites with Carolina Crane's-bill (Geranium carolinianum L.), Spring Forget-me-not {Myosotis verna Nutt.), and Small Skullcap {Scutellaria parvula Michx.). The subsequent branching level in each region separates Lake Huron shore sites from other sites (, those near the North Channel on Manitoulin Island and those inland or near the Georgian Bay shore on the Bruce Peninsula. To the extent that this separation is realistic, it may be explained by the occurrence of boreal and endemic elements, such as Carex capillaris, Erigeron philadelphicus ssp. provancheri, Poa alpina. Primula mistassinica, Solidago spathulata ssp. randii, and Sticky False Asphodel (Tofieldia glutinosa (Michx.) Pers.), on the cool, moist, windswept Lake Huron shore sites. Species associated with shallow sand deposits on top of the limestone, such as Anemone multifida, Cirsium hillii, and Slender Mountain-rice (Oryzopsis pungens (Torr. ex Spreng.) A. Hitchc), may also contribute to the difference between Lake Huron shore sites and other sites since they are either rare or entirely absent away from the Lake Huron shore. Lyre-leaved Rock Cress (Arabis lyrata L.) is fre- quent on some south shore pavements. On Manitoulin Island, Hymenoxys herbacea is confined to the south shore sites. In contrast. Green Milkweed (Asclepias viridiflora Raf.), Gattinger's Agalinis {Agalinis gattingeri (Small) Small ex Britton & A. Brown), Myosotis verna. Switch Grass {Panicum vir- g
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