Understory (or understorey, underbrush) in forestry and ecology refers to plant life growing beneath the forest canopy without penetrating it to any extent. Plants in the understory comprise an assortment of seedlings and saplings of canopy trees together with specialist understory shrubs and herbs.

An Index For Understory Light Levels in and Around Canopy Gaps
Understory Species Patterns and Diversity in Old-Growth and Managed Northern Hardwood Forests
Understory Vegetation as a Forest Ecosystem Driver: Evidence from the Northern Swedish Boreal Forest
Use of Amazonian Forest Fragments by Understory Insectivorous Birds
The Fern Understory as an Ecological Filter: Emergence and Establishment of Canopy-Tree Seedlings
Spatial genetic structure of a tropical understory shrub, PSYCHOTRIA OFFICINALIS (RuBIACEAE)
NEST PREDATION AND AVIAN SPECIES DIVERSITY IN NORTHWESTERN FOREST UNDERSTORY
Biotic Impoverishment and Homogenization in Unfragmented Forest Understory Communities
Effects of White‐Tailed Deer on Populations of an Understory Forb in Fragmented Deciduous Forests
Season and severity of prescribed burn in ponderosa pine forests: Implications for understory native and exotic plants