In underground modification of stem, in bulbs, tunicated bulbs have scaly leaves and naked do not possess them, then why are naked also known as scaly bulbs?
Gardening: What Are Bulbs, Corms, Tubers, and Rhizomes? - dummies
WHAT IS A PLANT BULB? |The Garden of Eaden
The bulb book; or, Bulbous and tuberous plants for the open air, stove, and greenhouse, containing particulars as to descriptions, culture, propagation, etc., of plants from all parts of the world
Bulb - Wikipedia
Bulb | Description, Functions, & Examples | Britannica