II. WOODLAND
II.A.4.N.e. Seasonally flooded temperate or subpolar needle-leaved evergreen woodland
II.A.4.N.e.3. CHAMAECYPARIS THYOIDES SEASONALLY FLOODED WOODLAND ALLIANCE
Atlantic White-cedar Seasonally Flooded Woodland Alliance
 

Concept: This open-canopy Atlantic white-cedar swamp occurs along streams of the Delmarva peninsula. It is also found in artificial mill ponds. The substrate is peat and muck characterized by hummock-and-hollow microtopography. The tree canopy is characterized by low-stature Chamaecyparis thyoides in association with Pinus taeda. The herbaceous layer is comprised of Peltandra virginica, Nymphaea odorata, Carex exilis, Dichanthelium dichotomum, Oxypolis rigidior, Triadenum virginicum, Dulichium arundinaceum, Glyceria obtusa, Rhynchospora alba, Carex atlantica, Selaginella apoda, Drosera rotundifolia, Juncus militaris, Vaccinium macrocarpon, Calopogon tuberosus, and Eriocaulon decangulare. Floating mats within mill ponds have unique species assemblages.

Range: This alliance is found in New York, New Jersey, Massachusetts, Delaware, and Maryland (?).

States/Provinces: DE MD

TNC Ecoregions: 58:C, 62:C

USFS Ecoregions: 232Aa:CCP, 232Ac:CC?, 232Ba:CC?, 232Bb:CC?, 232Bc:CC?, 232Bt:CCC, 232Bx:CCC, 232Bz:CCC

References:

Authors: ECS, MOD. S.L. NEID, East Identifier: A.571

Concept: This open-canopy Atlantic white-cedar swamp occurs along streams of the Delmarva peninsula. It is also found in artificial mill ponds. The substrate is peat and muck characterized by hummock-and-hollow microtopography. The tree canopy is characterized by low-stature Chamaecyparis thyoides in association with Pinus taeda. Other woody associates include Alnus maritima, Morella cerifera (= Myrica cerifera), Ilex glabra, and Clethra alnifolia. The herbaceous layer is comprised of Decodon verticillatus, Peltandra virginica, Nymphaea odorata, Carex exilis, Dichanthelium dichotomum, Oxypolis rigidior, Triadenum virginicum, Dulichium arundinaceum, Glyceria obtusa, Rhynchospora alba, Carex atlantica, Selaginella apoda, Drosera rotundifolia, Juncus militaris, Vaccinium macrocarpon, Calopogon tuberosus, and Eriocaulon decangulare. Floating mats within mill ponds have a unique species assemblage including Xyris difformis, Fuirena spp., Hypericum mutilum, Juncus pelocarpus, Juncus canadensis, Fimbristylis sp., and Rhynchospora macrostachya.

Range: This swamp type occurs along streams of the Delmarva peninsula.

States/Provinces: DE:S?, MD:S?

TNC Ecoregions: 58:C

USFS Ecoregions: 232Bt:CCC, 232Bx:CCC, 232Bz:CCC

References:

Authors: ECS Confidence: 3 Identifier: CEGL006307 

- Maryland Vegetation Classification Subset Report II. Woodland

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