Which one of the following is not essentially a species of the Himalaya vegetation?

Juniper, silver fir (Abies) and spruce are explicitly listed as characteristic trees of Himalayan and Western Himalayan vegetation, occurring in temperate and sub-alpine zones of the range [2]. Texts on Himalayan vegetation mention juniper as common at higher altitudes and identify silver fir and spruce among the conifers of these zones [3]. By contrast, mahogany is a tropical broad-leaved timber tree of lowland/tropical forests and is not part of the altitudinally zoned temperate and sub-alpine Himalayan flora; it is therefore not essentially a species of Himalayan vegetation. The correct answer is Mahogany (option 2).

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > Biogeographic zones of India > p. 25
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 5: Natural Vegetation and National Parks > 2. The North-Western Himalayan Region > p. 3
3. [3] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 10: Indian Forest > r0.r.14. Sub alpine forest > p. 163