JP Myers 1977 Vegetation notes : Shrub association S1 Salix glauca / Salix lanata - Polygonum acutiflorum Meade River, N. Slope Borough, Alaska 26 August Transact 7 offers a unique habitat to the transect system, large shrub association, up to 1-8 meters high! of these the 2 major ones (see also Salix alaxensis), S1 in highvalley along the river's edge : 3-4m | [illegible] a b c d e f g h i j k l m n o p q r s t u v w x y z SQ= S1= SB11 B2,8,3 etc see 26 Aug Journal Salix alaxensis S. glauca S. lanata - Polygonum acutiflorum It is a mixture of Salix glauca, Salix lanata as shrub species, very rarely with an alaxensis underlying. Understory: Polygonum acutiflorum (in lower area toward S2); when it is present S1 is called S1a as opposed to S1b (see next), Lupinus arcticus (when present - with Arctostaphylos = S1b) or, Arctostaphylos rubra, an Oxyria, and Dryas. Arctostaphylos becomes very abundant in the upper, drier end of S1. Lupinus appears to replace Polygonum, or rather the Lupinus - Arctostaphylos - Dryas understory became more apparent and prominent as the willow (glauca and lanata) became prostrate. Salix rehmanni also begins to figure as an understory species. Vegetation heights in S1a are higher than S1b, with the willows in S1a reaching 1m occasionally. S1b can be almost prostrate. On occasion the similarity between S1b, in its most deapauperati form, a dune Salix glauca cv/ Arctostaphylos, was disturbing.