Appendix B
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Key to the Plant Communities in the Pinus contorta
Forest of Crater Lake National Park, Oregon (from Zeigler, 1978)
(Pinus contorta must comprise at least 50% of the canopy, and is
usually much more important. The key species must be within 15 m of the
observer. The descriptions following the dash are simply aids to the field
worker. The number in parentheses following the community name corresponds to
the community number in the text and in Appendix C.)
A. Abies-Tsuga reproduction less than 10% of total reproduction
I. Calocedrus decurrens present in canopy and as reproduction -
steep rocky slopes; Arctostaphylos spp. and Ceanothus spp.
common
CALOCEDRUS DECURRENS/ARCTOSTAPHYLOS (1)
II. Calocedrus decurrens absent
1 - Purshia tridentata present in understory - east side;
Carex pensylvanica, Stipa occidentalis, Lupinus lepidus and
Haplopappus bloomeri present
PINUS CONTORTA/PURSHIA/CAREX (2)
11 - Purshia tridentata absenta Lupinus albicaulis
present - understory of C. pensylvanica, Stipa, Sitanion hystrix;
Ribes cereum and Haplopappus bloomeri may be present
PINUS CONTORTA/CAREX-LUPINUS (4)
aa Lupinus albicaulis absent - depauperate understory with
Carex, Stipa and Lupinus lepidus present; Eriogonum
marifolium and Spraguea umbellata may be present.
PINUS CONTORTA/CAREX-STIPA (3)
AA. Abies-Tsuga reproduction greater than 10% of total reproduction
(conspicuous)
I. Lupinus albicaulis and/or L. latifolius present
1 Abies concolor reproduction more abundant than A.
magnifica var. shastensis. - Bromus carinatus, Haplopappus
bloomeri, Carex, Stipa and Sitanion hystrix may be present.
ABIES CONCOLOR/BROMUS CARINATUS-LUPINUS (5)
11 Abies concolor less abundant (usually absent or rare) than
A. magnifica var. shastensis or A. lasiocarpa
a Lathyrus nevadensis and Collomia mazama present -
Solidago, Trifolium, Ranunculus species, Senecio triangularis,
Veratrum viridae as well as numerous other species may be present;
forest-meadow mosaic.
ABIES LASIOCARPA/COLLOMIA-LATHYRUS (6)
aa Lathyrus and Collomia absent
i at least two of the following species present: Elymus glaucus,
Aster ledophyllous, Haplopappus greenei, Penstemon rydbergii -
Forest-meadow mosaic.
ABIES LASIOCARPA/HAPLOPAPPUS/ASTER-ELYMUS (7)
ii above combination of species absent. - A. magnifica var.
shastensis and T. mertensiana reproduction abundant; Elymus glaucus
may be present.
ABIES MAGNIFICA VAR. SHASTENSIS-TSUGA MERTENSIANA/CAREX-LUPINUS
(8)
II. Lupinus albicaulis and L. latifolius absent
1 Purshia tridentata present - east side; steeper slopes; A.
magnifica var. shastensis, Pinus ponderosa, P. monticola, Arctostaphylos
spp. may be present.
MIXED CONIFER/ARCTOSTAPHYLOS-PURSHIA/STIPA (9)
11 Purshia tridentata absent
a Vaccinium scoparium present - cooler moister areas, T. mertensiana
present, depauperate understory.
TSUGA MERTENSIANA/VACCINIUM (10)
aa Vaccinium scoparium absent - Arctostaphylos spp. present, P.
monticola and A. magnifica var. shastensis present in quantity and may
be quite large. Tsuga mertensiana rare.
MIXED CONIFER/ARCTOSTAPHYLOS (11)
