APPENDIX B

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

CRATER LAKE

Report: Lodgepole Pine—History and Management

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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)

http://www.nps.gov/crla/lodgepole/lodgepoleab.htm

Date: 29-May-2001

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