Leymus mollis ssp. mollis  
n = 3
III.A.1.a. “Dry Graminoid Herbaceous- Elymus”
Ecosystem: Tidal


Beachrye (Leymus mollis ssp. mollis) is widespread and well known in North America.

Beachrye grass occurs as a tall, dense, usually linear stand oriented parallel to the beach on gravelly / sandy (or finer) berms at the storm line.  

Beachrye often exists as a monospecific (single species) stand, though pacific silverweed (Argentina egedii), Lyngbye’s sedge (Carex lyngbyei), largeflower speargrass (Poa eminens) and seaside arrowgrass (Triglochin maritimum), along with many other plants, are sometimes mixed in at low cover values.  

This type is not a jurisdictional wetland; it floods infrequently has a thin or absent organic soil layer and a deep water table.  However, it is surrounded by other wetlands, so supports many wetland functions.  The pH in this type has been reported to be circumneutral (Viereck et. al., 1992), although Boggs (2000) reports values up to 8.4; at the one site we measured it was a moderately alkaline 8.2.  This type, although classified in The Vegetation of Alaska (Viereck, et. al., 1992) as “dry graminoid”, many Beachrye stands may function as wetlands when flooding.

Table 1.  Summary of plant frequency and average cover for plants occurring in more than 50% of plots.

        Wetland Indicator Status



 Average Cover

  Alaska National
Leymus mollis ssp. mollis 1.0 68.3 FAC UPL, FAC
Argentina egedii 0.7 0.5 np
np- not present on wetland indicator status list.


 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

    Kenai Hydric Soils    Map Unit Summary    Methods    Glossary

Contact: Mike Gracz
Kenai Watershed Forum 
PO Box 15301
Fritz Creek, AK  99603
The Alaska Natural Heritage Program
Environment and Natural Resource Institute
University of Alaska, Anchorage
707 A Street, Suite 101
Anchorage, Alaska  99501

04 May 2007 09:40