正山小種

Noun

 * 1) lapsang souchong tea plant

Etymology 1
Borrowed from.

The spelling was apparently changed prior to borrowing into Japanese, replacing the character with the  character while keeping the pronunciation unchanged.

The reading is an approximation of modern 🇨🇬, and is thus neither on'yomi nor kun'yomi.

Noun

 * 1) lapsang souchong tea

Usage notes
This reading appears to be the most common.

Etymology 2
The spelling is borrowed from. The reading is the expected on'yomi for these characters.

Noun

 * 1) lapsang souchong tea

Usage notes
This reading appears to be substantially less common than rapusan sūchon above. However, it is also the most obvious reading from a Japanese perspective, using the standard Japanese pronunciation of the characters.