Table 2. The list of flowering crabapple germplasms.

No. Species/varieties	No. Species/varieties	No. Species/varieties	No. Species/varieties
1 Malus angustifolia	34 M. sieversii	67 M. ‘Golden Hornet’	100 M. ‘Radiant’
2 M. asiatica21	35 M. sikkimensis36	68 M. ‘Golden Raindrop’	101 M. ‘Red Baron’
3 M. baccata	36 M. spectabilis	69 M. ‘Gorgeous’	102 M. ‘Red Jade’
4 M. coronaria31	37 M. sylvestris	70 M. ‘Guard’	103 M. ‘Red Sentinel’
5 M. daochengensis21	38 M. toringoides	71 M. halliana ‘Pink Double’	104 M. ‘Red Splendor’
6 M. domestica var. binzi	39 M. transitoria31	72 M. ‘Harvest Gold’	105 M. ‘Regal’
7 M. doumeri33	40 M. trilobata31	73 M. ‘Hillier’	106 M. ‘Robinson’
8 M. florentina31	41 M. tschonoskii	74 M. ‘Hopa’	107 M. ‘Roger’s Selection’
9 M. floribunda	42 M. turkmenorum	75 M. ‘Hydrangea’	108 M. ‘Royal Beauty’
10 M. fusca	43 M. yunnanensis	76 M. ‘Indian Magic’	109 M. ‘Royal Gem’
11 M. glaucescens31	44 M. zhaojaoensis37	77 M. ‘Indian Summer’	110 M. ‘Royal Raindrop’
12 M. halliana32	45 M. zumi38	78 M. ‘Kelsey’	111 M. ‘Royalty’
13 M. honanensis	46 M. ‘Abundance’	79 M. ‘King Arthur’	112 M. ‘Rudolph’
14 M. hupehensis	47 M. ‘Adams’	80 M. ‘Klehm’s Improve Bechtel’	113 M. ‘Rum’
15 M. ioensis	48 M. ‘Amey’	81 M. ‘Lancelot’	114 M. ‘Show Time’
16 M. jinxianensis21	49 M. ‘Ballet’	82 M. ‘Lisa’	115 M. ‘Snowdrift
17 M. kansuensis31	50 M. ‘Brandywine’	83 M. ‘Liset’	116 M. ‘Sparkler’
18 M. kirghisorum33	51 M. ‘Butterball’	84 M. ‘Lollipop’	117 M. ‘Spring Glory’
19 M. komarovii21	52 M. ‘Cardinal’	85 M. ‘Louisa Contort’	118 M. ‘Spring Sensation’
20 M. lancifolia34	53 M. ‘Centurion’	86 M. ‘Makamik’	119 M. ‘Spring Snow’
21 M. mandshurica	54 M. ‘Cinderella’	87 M. ‘Mary Potter’	120 M. ‘Strawberry Jelly’
22 M. melliana35	55 M. ‘Cloudsea’	88 M. ‘May’s Delight’	121 M. ‘Sugar Tyme’
23 M. micromalus	56 M. ‘Coralburst’	89 M. ‘Molten Lava’	122 M. ‘Sweet Sugar Tyme’
24 M. ombrophila	57 M. ‘Darwin’	90 M. ‘Perfect Purple’	123 M. ‘Thunderchild’
25 M. platycarpa	58 M. ‘David’	91 M. ‘Pink Princess’	124 M. ‘Tina’
26 M. prattii21	59 M. ‘Dolgo’	92 M. ‘Pink Spires’	125 M. ‘Vans Eseltine’
27 M. prunifolia	60 M. ‘Donald Wyman’	93 M. ‘Praire Rose’	126 M. ‘Velvet Pillar’
28 M. pumila	61 M. ‘Eleyi’	94 M. ‘Prairifire’	127 M. ‘Weeping Madonna’
29 M. pumila var. neidzwetzkyana	62 M. ‘Everest’	95 M. ‘Professor Sprenger’	128 M. ‘White Cascade’
30 M. robusta	63 M. ‘Fairytail Gold’	96 M. ‘Profusion’	129 M. ‘Winter Gold’
31 M. rockii	64 M. ‘Firebird’	97 M. ‘Purple Gems’	130 M. ‘Winter Red
32 M. sargentii	65 M. ‘Flame’	98 M. ‘Purple prince’	131 M. zumi ‘Calocarpa’
33 M. sieboldii31	66 M. ‘Furong’	99 M. × purpurei ‘Neville Copeman’

Superscript indicates the 20 flowering crabapple species whose pollen information were retrieved from the literature. The other 111 samples were collected from the Flowering Crabapple Germplasm Resources Garden, Nanjing Forestry University.