27 Vascular Site Number
27 Cryptogam and Vascular
Figure 21. Locations of floristic inventory sites in the northeast section
of Tanana Flats.
restricted to the North American boreal forest.
These include Picea glauca, P. mariana, Betula
papyrifera, Viburnum edule, and Mertensia paniculata.
Some common taxa, however, are circumboreal in
The maps (Fig. 1621) and the list of inventory
distribution, ranging across the boreal forest in
sites in Appendix B show that the sites well repre-
North America and Eurasia. Examples of this ele-
sent the range of environmental and geographic
ment include Rosa acicularis, Betula nana, Vaccinium
variation on FWA. Inventory sites occur in all of
vitis-idaea, and V. uliginosum.
the major floristic subdivision units and across a
Two of the more distinct elements of the flora
broad range of special habitats and elevations.
of Fort Wainwright are the taxa of alpine areas and
Table 2 shows that at least 63 of the 97 vegetation
the taxa found on xeric sites, especially the steppe-
cover types mapped for the Tanana Valley (SCS/
like vegetation of steep, south-facing bluffs.
DNR 1990) were inventoried in at least one of these
The alpine flora on FWA includes about 80 spe-
floristic regions. Many of these were surveyed re-
cies, but it is relatively species-poor in compari-
peatedly throughout the summer and across the
son with other alpine areas of interior Alaska and
various floristic inventory units.
includes only 80 taxa, less than half of which were
also found in other regions of FWA. Most of the
Vascular floristic affinities
species of this distinctive azonal element are wide-
The flora of Fort Wainwright is typical of the
spread across the arctic and alpine regions and
boreal region of interior Alaska and reflects the
range of habitats found there. Many of the promi-
include species such as Dryas octopetala, Hierochloe
alpina, Loiseleuria procumbens, and Pedicularis
nent species that give the forest its character are