Table 1.

Species, population localities, and photoperiods of samples investigated in this study.

Species	Population locality	Photoperiod	Voucher number
Sceletium tortuosum	Warmwaterberg	12 h 20 min	Reddy 001 SU
	Rooiberg	12 h 16 min	Reddy 002 SU
	Gamkaberg	10 h 34 min	Reddy 003 SU
	Drie Kuilen	12 h 5 min	Reddy 004 SU
	Die Hel	10 h 34 min	Reddy 005 SU
	De Rust	10 h 35 min	Reddy 006 SU
	Kannaland	12 h 15 min	Reddy 007 SU
	Ladismith 1	12 h 15 min	Reddy 008 SU
	Ladismith 2	12 h 15 min	Reddy 009 SU
Sceletium strictum	Anysberg	12 h 8 min	Reddy 010 SU
Sceletium emarcidum	Calitzdorp	12 h 13 min	Reddy 011 SU
Sceletium rigidum	Prince Albert	12 h 11 min	Reddy 012 SU