Quick answer: 86 native Iowa plants have a recorded bloom range that includes June.
86 species
- American basswood Tilia americana · 32 states
- American bellflower Campanulastrum americanum · 19 states
- American bittersweet Celastrus scandens · 11 states
- American bladdernut Staphylea trifolia · 15 states
- American hazelnut Corylus americana · 16 states
- American plum Prunus americana · 25 states
- Arctic brome (Kalm's brome) Bromus kalmii · 5 states
- Birdfoot violet Viola pedata · 14 states
- Black cherry Prunus serotina · 32 states
- Black-eyed Susan Rudbeckia hirta · 42 states
- Blackhaw Viburnum prunifolium · 12 states
- Blue vervain Verbena hastata · 11 states
- Broadleaf cattail Typha latifolia · 11 states
- Butterflyweed Asclepias tuberosa · 37 states
- Canada anemone Anemone canadensis · 22 states
- Canada wild rye Elymus canadensis · 18 states
- Canadian wild ginger Asarum canadense · 8 states
- Candle anemone (thimbleweed) Anemone cylindrica · 5 states
- Cardinal flower Lobelia cardinalis · 37 states
- Chokecherry Prunus virginiana · 35 states
- Cockspur hawthorn Crataegus crus-galli · 4 states
- Common buttonbush Cephalanthus occidentalis · 23 states
- Common ninebark Physocarpus opulifolius · 22 states
- Common snowberry Symphoricarpos albus · 7 states
- Coralberry Symphoricarpos orbiculatus · 20 states
- Downy hawthorn Crataegus mollis · 7 states
- Eastern leatherwood Dirca palustris · 5 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Eastern red columbine Aquilegia canadensis · 36 states
- Fireweed Chamerion angustifolium · 28 states
- Flowering spurge Euphorbia corollata · 6 states
- Foxglove beardtongue Penstemon digitalis · 31 states
- Fragrant sumac Rhus aromatica · 14 states
- Golden alexanders Zizia aurea · 12 states
- Gray dogwood Cornus racemosa · 8 states
- Grayhead coneflower Ratibida pinnata · 12 states
- Green ash Fraxinus pennsylvanica · 23 states
- Harebell Campanula rotundifolia · 25 states
- Heart-leaved meadow parsnip Zizia aptera · 8 states
- Highbush cranberry Viburnum opulus var. americanum · 8 states
- Indigo bush Amorpha fruticosa · 16 states
- Jack-in-the-pulpit Arisaema triphyllum · 14 states
- Kentucky coffeetree Gymnocladus dioicus · 15 states
- Large penstemon (shell-leaf beardtongue) Penstemon grandiflorus · 8 states
- Leadplant Amorpha canescens · 10 states
- Little bluestem Schizachyrium scoparium · 23 states
- Longbract wild indigo (cream false indigo) Baptisia bracteata var. leucophaea · 5 states
- Low prickly pear Opuntia humifusa · 6 states
- Mexican hat Ratibida columnifera · 17 states
- Nannyberry Viburnum lentago · 23 states
- Narrow-leaf coneflower Echinacea angustifolia · 9 states
- New Jersey tea Ceanothus americanus · 31 states
- Northern bush honeysuckle Diervilla lonicera · 5 states
- Pagoda dogwood Cornus alternifolia · 25 states
- Partridge pea Chamaecrista fasciculata · 13 states
- Prairie Junegrass Koeleria macrantha · 15 states
- Prairie blue-eyed grass Sisyrinchium campestre · 6 states
- Prairie cordgrass Spartina pectinata · 5 states
- Prairie crabapple Malus ioensis · 8 states
- Prairie dropseed Sporobolus heterolepis · 11 states
- Prairie goldenrod Solidago nemoralis · 7 states
- Purple meadow-rue Thalictrum dasycarpum · 7 states
- Quaking aspen Populus tremuloides · 24 states
- Red baneberry Actaea rubra · 22 states
- Red-osier dogwood Cornus sericea · 22 states
- Richardson's alumroot Heuchera richardsonii · 8 states
- Rocky Mountain bee plant Peritoma serrulata · 22 states
- Shagbark hickory Carya ovata · 22 states
- Showy tick trefoil Desmodium canadense · 21 states
- Shrubby St. John's-wort Hypericum prolificum · 12 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Smooth Solomon's seal Polygonatum biflorum · 13 states
- Smooth oxeye Heliopsis helianthoides · 12 states
- Smooth rose Rosa blanda · 8 states
- Smooth sumac Rhus glabra · 34 states
- Staghorn sumac Rhus typhina · 13 states
- Swamp milkweed Asclepias incarnata · 25 states
- Virginia bluebells Mertensia virginica · 14 states
- Virginia creeper Parthenocissus quinquefolia · 27 states
- Virginia strawberry Fragaria virginiana · 8 states
- White baneberry Actaea pachypoda · 16 states
- White meadowsweet Spiraea alba · 8 states
- White wild indigo Baptisia alba · 10 states
- Whorled milkweed Asclepias verticillata · 6 states
- Wild geranium Geranium maculatum · 11 states
- Winecup Callirhoe involucrata · 7 states