noun
Refers specifically to Rhododendron indicum, a type of azalea that blooms in late spring (around May). The reading さつき is the standard modern name; とけんか is a rare Sino-Japanese reading.
See also: サツキ
庭にサツキが咲いている。
Satsuki azaleas are blooming in the garden.
サツキは五月頃に花を咲かせる。
Satsuki azaleas bloom around May.
ツツジ is the general term for azalea, while サツキ refers specifically to Rhododendron indicum, a late-blooming variety.
The name サツキ comes from 皐月 (さつき), the old Japanese name for the fifth month of the lunar calendar, when this azalea typically blooms. The kanji 杜鵑花 is a Chinese-derived spelling, but its exact historical adoption is uncertain.