. The Canadian field-naturalist. Natural history; Sciences naturelles. 360 The Canadian Field-Naturalist Vol. 120 least the presence of distinctive genetic variants with- in broadly defined species. Further study may indi- cate both of these to be worthy of taxonomic recog- nition. A restricted glabrous variant of Viola sagittata var. ovata (f. glabrata) occurs on the dry open sand with the more typical form. Three taxa have been described from Annapolis heathlands: Amelanchier lucida Fer- nald, Dichanthelium (sub Panicum) depauperatum var. psilophyllum f. cryptostachys Femald, and Rubus par-
. The Canadian field-naturalist. Natural history; Sciences naturelles. 360 The Canadian Field-Naturalist Vol. 120 least the presence of distinctive genetic variants with- in broadly defined species. Further study may indi- cate both of these to be worthy of taxonomic recog- nition. A restricted glabrous variant of Viola sagittata var. ovata (f. glabrata) occurs on the dry open sand with the more typical form. Three taxa have been described from Annapolis heathlands: Amelanchier lucida Fer- nald, Dichanthelium (sub Panicum) depauperatum var. psilophyllum f. cryptostachys Femald, and Rubus par- ticeps Bailey. The heathland ecosystem is particularly valuable as a reservoir of genetic variation in crops and crop rel- atives. Femald (1921) commented on the remarkable variation in wild blueberries (Vaccinium angustifolium and V. myrtilloides) in Annapolis heathland remnants near Middleton. In addition to blueberries (Table 2) there are potential genotypes of Aronia (Aronia sp.), of blackberries (Rubus hispidus and others), juneber- ries (Amelanchier lucida and A. laevis), huckleberries (Gaylussacia baccata and G. dumosa), cherries (Pru- nus pensylvanica, P. virginiana, and P. serotina) and a strawberry (Fragaria virginiana). Variation between sites Although all sites shared dominant species (Table 2) they varied in diversity from 26 to 57 native species. Much of the variation between sites appeared to be attributable to disturbance and soil moisture. Those sites with lower lying and periodic moist areas and open sand had the highest vascular plant diversity. Site 10 for example was the most unlike the other sites in native species composition, possibly a result of parts of it having a relatively high water table and disturbed areas of periodically moist sand where dry ground species such as Carex tonsa var. rugosperma and Danthonia spicata occurred with wetland species such as Drosera intermedia. Characteristic native species and "at risk" or "sen- sitive&q
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