Table 1. Distribution of scopoletin (1), isofraxidin (2), and geniposidic acid (3) in leaves, stem bark and root bark extracts from examined Ixora and Greenea species collected from northeastern and southern Thailand.

Species	Collector No.	Origin	Leaves	Stem bark	Root bark
I. javanica (Blume) DC.	RB001	Nakhon Ratchasima	(1)	(1), (2)	NS
	RB002	Nakhon Ratchasima	(1)	(1), (2)	(1), (2)
	RB021	Chalung, Songkhla	–	(1)	NS
	RB023	Phang Nga	NS	(1)	(1)
	RB025	Thung Tam Sao, Songkhla	(1)	(1)	NS
	RB028	Thung Tam Sao, Songkhla	(1)	(1)	NS
	RB041	Trang	(1)	(1)	(1)
	RB042	Trang	(1)	(1)	(1)
	RB024	Phang Nga	(1)	(1)	NS
I. cibdela Craib	RB046	Sakon Nakhon	(1), (3)	(1), (2), (3)	(1), (2), (3)
	RB047	Sakon Nakhon	NS	NS	(1), (2), (3)
	RB048	Sakon Nakhon	NS	NS	(1), (2), (3)
I. diversifolia R. Br. ex Kurz	RB026	Thung Tam Sao, Songkhla	(1), (3)	(1)	NS
	RB027	Thung Tam Sao, Songkhla	(1), (3)	(1), (3)	NS
I. pendula Jack	RB031	Thung Tam Sao, Songkhla	(3)	(3)	NS
I. nigricans R. Br. ex Wight & Arn	RB020	Chalung, Songkhla	–	–	NS
	RB029	Thung Tam Sao, Songkhla	–	–	NS
	RB030	Satun	–	–	–
	RB004	Chumphon	–	–	NS
I. grandifolia Zoll. & Moritzi	RB003	Chumphon	–	–	–
I. lobbii Loundon	RB034	Thung Tam Sao, Songkhla	–	NS	NS
I. brunonis Wall. ex G. Don.	RB032	Thung Tam Sao, Songkhla	–	(1)	(1)
G. montana Tange	RB011	Chumphon	(1), (2), (3)	(1), (2), (3)	(1), (2), (3)
	RB012	Chumphon	(1), (2), (3)	(1), (2), (3)	(1), (2), (3)
G. corymbose Jack (Voigt)	RB022	Chalung, Songkhla	(1), (2), (3)	(1), (2), (3)	NS

Note:

NS, not studied; –, none of three compounds detectable; northeastern Thailand: Nakhon Ratchasima, and Sakon Nakhon provinces; southern Thailand: Chumphon, Phang Nga, Songkhla, Trang, and Satun provinces.