Plant
Mountain Hemlock
Tsuga mertensianaAlso known as Mertens' Hemlock, Black Hemlock
Mountain hemlocks anchor high-elevation forests across western North America, thriving in subalpine zones where snowpack lingers deep into summer. Their graceful drooping tops, blue-green needles radiating around flexible twigs, and downward-sloping branches are perfectly adapted to shed heavy mountain snowfall. At extreme treelines, these resilient conifers form dense, wind-sheared krummholz mats shaped by fierce alpine gales.
ConiferEvergreenAlpine
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Diet & preyAutotrophic (Photosynthesis)
ThreatsClimate change, warming winter temperatures, and severe wildfires
HabitatsSubalpine forests and high-elevation mountain slopes
Life span400 to 800 years
Classification
- OrderPinales
- FamilyPinaceae
- GenusTsuga
- SpeciesTsuga mertensiana
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Safe to observe at a normal distance.
Responsible observation
- Needle Check: Look for soft blue-green needles growing all around the twig rather than in two flat ranks.
- Branch Habit: Notice how the central leader droops downward and branches slope to shed heavy snow.
- Cone Identification: Observe slender cylindrical cones hanging from branch tips, larger than western hemlock cones.
Frequent Companion (c) David Anderson, some rights reserved (CC BY), uploaded by David Anderson · cc-by
Frequent Companion (c) Sam Beaumont, some rights reserved (CC BY), uploaded by Sam Beaumont · cc-by
Close Relative (c) Lyrae, some rights reserved (CC BY), uploaded by Lyrae · cc-by
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