Table 3.

Chemical composition of nectar in Ipomoea species

			Sugars (%)
Species	Population no.	Sucrose	Fructose	Glucose	r	hr	hs
I. alba	1	87·19 ± 4·84	8·78 ± 3·21	4·01 ± 2·53	6·81	0·45	5
	2	63·14 ± 2·01	20·43 ± 1·84	16·42 ± 2·41	1·71	0·80	5
	3	82·21 ± 3·88	13·80 ± 4·24	3·98 ± 0·97	4·62	0·28	4
Mean		77·51 ± 12·7	14·33 ± 5·84	8·13 ± 7·17	3·45	0·56
I. cairica	2	0·52 ± 0·37	34·54 ± 2·06	64·93 ± 2·42	0·005	1·87	5
	5	35·62 ± 3·34	18·81 ± 1·72	45·52 ± 2·09	0·55	2·41	6
	3	0·37 ± 0·30	36·52 ± 3·69	63·10 ± 3·99	0·003	1·72	2
	1	0·34 ± 0·23	32·33 ± 1·68	67·32 ± 2·87	0·003	2·08	5
	4	15·43 ± 2·12	36·86 ± 1·38	47·68 ± 0·75	0·18	1·29	4
Mean		10·45 ± 15·5	31·81 ± 7·49	57·71 ± 10·3	0·12	1·81
I. indica	4	55·74 ± 4·05	18·41 ± 3·92	25·84 ± 2·13	1·25	1·40	6
	3	50·74 ± 6·71	21·12 ± 1·81	28·12 ± 4·90	1·03	1·33	7
	2	54·31 ± 1·89	18·81 ± 2·13	26·87 ± 1·37	1·18	1·42	7
Mean		53·60 ± 2·58	19·45 ± 1·46	26·94 ± 1·14	1·15	1·39
I. hieronymi	2	60·39 ± 10·97	15·58 ± 6·22	24·01 ± 5·25	1·52	1·54	2
	1	65·04 ± 5·76	11·03 ± 2·49	23·91 ± 3·27	1·86	2·17	2
Mean		62·72 ± 3·28	13·31 ± 3·21	23·96 ± 0·07	1·68	1·80
I. rubriflora	2	66·08 ± 4·98	22·13 ± 5·00	11·78 ± 2·52	1·94	0·53	6
	1	64·86 ± 4·57	19·17 ± 3·88	15·96 ± 2·61	1·84	0·83	6
	3	62·61 ± 8·93	13·95 ± 8·74	23·42 ± 4·33	1·67	1·67	5
Mean		64·52 ± 1·76	18·42 ± 4·14	17·05 ± 5·89	1·82	0·93
I. purpurea	4	68·71 ± 5·07	7·48 ± 2·55	23·79 ± 2·50	2·19	3·18	3
	2	65·74 ± 7·52	14·01 ± 1·67	20·24 ± 3·84	1·91	1·44	3
	3	69·63 ± 6·62	8·96 ± 4·00	21·41 ± 2·93	2·29	2·38	5
	1	78·68 ± 2·00	10·27 ± 0·85	11·04 ± 1·14	3·69	1·07	5
	5	60·08 ± 5·51	15·88 ± 3·37	24·03 ± 4·07	1·50	1·51	4
Mean		68·57 ± 6·77	11·32 ± 3·52	20·10 ± 5·31	2·18	1·78

Values are means ± s.d.

r, Sugar ratio; hr, hexose ratio; hs, histidine scale.

Population nos corresponds to those in Table 1 and the number of individuals sampled for each one was four.