Table 2 (Cont'd).
Geographic Division and Collection Unit, March 1996
Tanana Flats of the Tanana Lowland Unit
YukonTanana Upland Unit
Low-
Slope
Tanana
lands
forests
Canton-
Low-
Blair River
ment
lands
Fens
Buttes Lakes riparian FBX
YMA
FBX
YMA Alpine area
D. Aquatic
1. Freshwater
a. Pondlily
X
X
X
X
11
22
X
b. Common marestail
X
X
X
X
11
X
X
c. Aquatic buttercup
X
X
87
X
X
X
53
X
59
e. Water milfoil
X
67
X
X
11
17
X
f. Fresh pondweed
X
X
65
X
50,
17,22
76
6163
Non-Viereck Classification Units Visited During a Floristic Inventory of Fort Wainright.
B. Barrennatural
1. Intermittent stream
81,82
X
34
X
51
X
16,17,
X
52
X
X
channels
56
2. Sand, silt, or gravel bars
41,81,82
34
30 43,44,51,
16,56
1
70,74,77,
78,84,93
3. Rock
5,8,87
32
X
13,14
C. Cultural
1. Bare ground
X
51
11
X
27
2. Urban
59,60,
66,75
3. Gravel pits, quarries
11
X
15
X
27
4. Road, rail, powerline
X
51,74 23,28,33 22,56, 10,15, 26,
14
46,57,
rights-of-way
28,33,50, 73
20,29, 88-90
60,75
62
48
sedges and bunch grasses. On FWA the Wood
capitata. A smaller number of the FWA alpine taxa
River Buttes included species of the Asian steppe
are more restricted in range, a good example be-
such as Festuca lenensis and Carex duriuscula, as well
ing the interior Alaskan endemic Syntheris borea-
as North American grassland species such as
lis. Notable by their absence were other common
Elytrigia spicata and Carex filifolia. Other species,
alpine endemics of Alaska, such as Claytonia
such as Calamagrostis purpurascens, are wide-
scammaniana and Boykinia richardsonii, and com-
ranging across dry grasslands in the circumpolar
mon, widespread, arcticalpine species such as
area.
Silene acaulis and Thalictrum alpinum.
Wetland and aquatic habitats also display a dis-
Steep, south-facing slopes in interior Alaska are
tinct flora and species on FWA. Many of these spe-
known to contain a distinctive flora that many
cies show a discontinuous distribution, reflecting
have seen as an analog of the steppetundra flora
thought to have been widespread during glacial
the disjunct nature of their habitat across the bo-
real region as well as being an artifact of the lim-
maxima 10,00025,000 years ago. Some of the spe-
ited collecting usual in this habitat. As additional
cies found in these environments today are com-
surveys document the flora of wetlands in Alaska
mon members of the regional flora, but many of
and Canada, many of these species that were pre-
the taxa are only found on xeric slopes or their
equivalent, such as dry river terraces and gravels.
viously thought to be disjunct or rare in their dis-
The signature species of these xeric, steppic sites
tribution are now proving to be more common or
are the shrub Artemisia frigida and certain dry-site
continuous in their range. Examples from FWA
21
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