Table 1.

Mean pollen and ovule numbers, pollen-to-ovule ratios and variances thereof in the eight species studied and a comparison with previously published values. Mean low., mean number of ovules on bottom flowers of inflorescences; SE, standard error; N, sample number; Var, variance. From lit., values from published literature.

Species	Pollen grain number				Ovule number					Pollen: Ovule ratio				Deceptive (D)/ Rewarding (R)
	Mean	SE	N	From lit.	Mean	SE	Mean low.	N	From lit.	Mean	SE	Var	From lit.
Anacamptis morio	104817	3207	6	–	7347	952	9827	9	>4000b, 4770 ± 1856c 5052d, 4978±521m	18	2.9	49	13a	D k
Anacamptis pyramidalis	74013	2407	8	–	3435	232	4350	11	1935b, 3036d 2262 ± 205m	24	1.7	22	–	D h
Dactylorhiza fuchsii	51917	4075	6	–	2659	327	3413	8	6200f, 3294 ± 774b 5205 ± 914m	25	5.0	152	21a	R j
Dactylorhiza incarnata	79113	2761	8	194748g	6715	846	9030	11	7270d, e 7756g 7076 ± 881m	13	1.7	23	12.6 (25.2)g	D k
Dactyorhiza majalis	72050	2422	10	–	4528	455	5447	12	9639 ± 421m	19	2.2	46	–	D l
Dactylorhiza viridis	35588	2823	8	–	1413	134	1772	12	1339 ± 693b 1453 ± 136m	29	4.3	147	–	R i
Orchis militaris	176417	26062	6	–	12616	1296	14183	7	10948 ± 3274m	15	2.2	30	–	D k
Platanthera bifolia	215978	25687	6	217396 g	3779	514	4930	6	3666d, e 4004g 6146 ± 325m	59	5.4	175	27.1 (54.3)g	R k

^a Neiland and Wilcock (1995)

^b Salisbury (1942) ^*

^c Jersáková and Kindlmann (1998) ^*

^d Nazarov (1995) ^*

^e Nazarov (1998) ^*

^f Darwin (1862) ^*

^g Nazarov and Gerlach (1997)

^h Daumann (1941)

ⁱ Claessens and Kleynen (2011) ^*

^j Dafni and Woodell (1986) – reward as sugary stigmatic exudate

^k Inda et al. (2012) and references therein

^l Hansen and Olesen (1999)

^m Sonkoly et al. (2016) ^*

^*Indicates that ovules were counted as seeds in these studies.