Flowering and Seed Collection Dates
Perennials, Shrubs, and Trees Growing in Maine.


Species Common name Spore Collection Date Observed Location
Dryopteris goldiana Goldie's fern July 11 Alfred, Maine
Gymnocarpium dryopteris Oak fern August 4 Alfred, Maine
Polystichum acrostichoides Christmas fern July 11 Alfred, Maine
Osmunda cinnamomea Cinnamon fern June 15 Alfred, Maine
Osmunda claytoniana Interrupted fern June 8 Alfred, Maine
Osmunda regalis Royal Fern June 1 Alfred, Maine


Species Common name Flowering Time Seed Collection Observed Location
Acorus americana Sweet flag June 3 NA Alfred, Maine
Actaea pachypoda Dolls eyes May 31 August 16 Alfred, Maine
Allium tricoccum Ramps, Wild leeks July 12 NA Wade, Maine
Aquilegia canadensis Wild comlumbine May 28 June 24 Alfred, Maine
Aralia nudicaulis Wild sarsparilla May 10 July 5 Alfred,Maine
Aralia racemosa Spikenard July 5 August 8 Alfred,Maine
Asarum canadensis Wild Ginger April 25 NA Alfred,Maine
Asclepias incarnata Swamp milkweed July 21 September 25 Alfred,Maine
Asclepias exaltata Poke milkweed July 1 NA Alfred,Maine
Asclepias syriaca Common milkweed July 21 September 15 Alfred,Maine
Aster novae angeliae New Engand aster October 8 November 20 Alfred,Maine
Aster macrophylla Big leaved Aster July 28 October 14 Alfred,Maine
Aster umbellatus Flat topped Aster August 30 October 14 Alfred,Maine
Aureolaria pedicularis Fern leaf false foxglove August 25 October 16 Alfred,Maine
Calopogon tuberosus Grass Pink July 6 NA Limington,Maine
Caltha palustris Marsh marigold May 20 NA Alfred,Maine
Chelone glabra Turtle head August 25 October 9 Alfred,Maine
Coptis trifolium Goldthread May 12 NA Alfred,Maine
Cornus canadensis Dogtooth violet NA July 28 Alfred,Maine
Corydalis sempervirens Pale corydalis June 5 June 24 Alfred,Maine
Clintonia borealis Bluebead lilly May 29 August 15 Alfred,Maine
Cypripedium acuale Pink ladyslipper May 29 NA Alfred,Maine
Cypripedium parviflorum Yellow ladyslipper July 12 NA Wade, Maine
Dalibarda repens False violet July 12 September 13 Alfred,Maine
Drosera rotundafolia Sundew July 28 NA Alfred,Maine
Epigaea repens Mayflower, Trailing arbutus April 30 July 1 Alfred,Maine
Eupatorium perfoliatum Boneset July 21 October 14 Alfred,Maine
Eupatorium maculatum Joe pye weed August 10 October Alfred,Maine
Gaultheria procumbens Wintergreen July 21 November Alfred,Maine
Geranium maculatum Wild geranium, Cranesbill April 24 June 5 Alfred,Maine
Goodyera tesselata Checkered Rattlsnake Plantain July 28 NA Alfred,Maine
Gentiana linearis Closed gentian August 25 NA Alfred,Maine
Hepatica nobilis var americana Liverwort April 24 June 5 Alfred,Maine
Hydrastis canadensis** Goldenseal May 15 August 1 Alfred,Maine
Iris versicolor Wild iris June 3 September 1 Alfred,Maine
Jeffersonia diphylla** Twinleaf May 6 July 5 Alfred,Maine
Liatris scariosa var novae-angelae Liatris August 24 September 24 Kennebunk, Maine
Lilium philadelphicum Wood lilly July 12 NA Alfred,Maine
Lobelia cardanalis Cardinal flower August 14 September 19 Alfred,Maine
Lythrum salicaria Purple loosestrife May 21 NA Alfred,Maine
Maianthemum canadense Mayflower May 29 September Alfred,Maine
Mitchella repens Partridge berry June 23 November Alfred,Maine
Monotropa uniflora Indianpipe July 28 NA NA
Panax quinquefolius American ginseng July 11 September 10 Alfred,Maine
Podophyllum peltatum Mayapple May 28 NA Alfred,Maine
Pogonia ophioglossoides Rose pink July 11 NA Greenville, Maine
Polygala paucifolia Fringed polygala May 28 NA Alfred,Maine
Ranunculus gmnellii Small yellow water crowfoot July 10 NA Presque Isle, Maine
Rhodiola rosea Roseroot July 28 Aug/Sept Alfred,Maine
Sanguinera canadensis Bloodroot April 27 June 23 Alfred,Maine
Sarracenia pupurea Northern Pitcher plant June 17 September Alfred,Maine
Schizachyrium scoparium Little blue stem grass Aug 4 Aug 31 Alfred,Maine
Similacina racemosa False Solomons seal May 29 Sept 1 Alfred,Maine
Solidago arguta Forest goldenrod August 14 October 14 Alfred,Maine
Solidago bicolor Silverrod August 31 Sept/Oct Alfred,Maine
Solidago canadensis Common goldenrod August 1 Sept/Oct Alfred,Maine
Solidago caesia Blue stem goldenrod September 15 October 14 Alfred,Maine
Solidago puberula Downy or Dusty Goldenrod August 26 October Alfred,Maine
Solidago sempervirens Seaside goldenrod October 10 September 26 Kennebunkport,Maine
Solidago rugosa Rough stemmed goldenrod September 1 October/Nov Alfred,Maine
Spiranthes lucida Shining ladies tresses July 11 NA Wade, Maine
Trillium erectum Stinking Benjamin May 11 August 15 Alfred,Maine
Vaccinium macrocarpon Cranberry July 11 NA Greenville, Maine

Shrubs and Vines

Species Common name Flowering Time Seed Collection Observed Location
Acer pennsylvanicum Moosewood May 11 September 26 Alfred, Maine
Acer spicatum Mountain maple June 5, 2008 August 22 Alfred, Maine
Alnus rugosa Speckled alder April 5 October 12 Alfred,Maine
Amelanchier canadensis Shadbush May 12 June 23 Alfred,Maine
Amelanchier laevis Smooth shadbush May 8 July 4 Alfred,Maine
Amelanchier stolonifera Thicket shadbush May 15 July 4 Alfred,Maine
Aronia melanocarpa Black chokeberry May 20 July 28 Alfred,Maine
Carpinus caroliniana Blue beech NA September 3 Alfred, Maine
Celastrus orbiculata Oriental bittersweet June 10 July 28 Alfred,Maine
Cephalanthus occidentalis Buttonbush July 21 November 9 Alfred,Maine
Chamaedaphne calyculata Leatherleaf NA October 14 Alfred,Maine
Clethra anifolia Summersweet August 11 October 30 Acton, Maine
Comptonia peregrina Sweetfern May 2 July 21 Alfred,Maine
Cornus alternifolia Pagoda dogwood May 31 July 4 Alfred, Maine
Cornus amomum Silky dogwood NA September 19 Alfred, Maine
Corlylus americana Hazlenut April 5 September 3 Alfred,Maine
Corylus cornuta Beaked hazlenut April 5 August 5 Alfred,Maine
Diervilla lonicera Bush honeysuckle June 10 September 1 Alfred,Maine
Dirca palustris Leather wood May 9 NA Alfred,Maine
Gaylussacia baccata Huckleberry May 29 July 28 Alfred,Maine
Ilex verticillata Winterberry June 18 October 5 Alfred,Maine
Ilex laevigata Smooth winterberry NA October 3 Sanford, Maine
Juniperus communis Juniper May 29(pollen release) NA Alfred,Maine
Kalmia angustifolia Sheep kill June 14 NA Alfred, Maine
Kalmia latifolia Mountain laurel NA November 10 Sanford, Maine
Lindera benzoin Spicebush May 2 September 19 Alfred,Maine
Lonicerea canadensis Fly honeysuckle May 2 July 4 Alfred,Maine
Lyonia ligustrum Maleberry June 24 October 14 Alfred,Maine
Myrica gale Sweet gale NA Sepetember 15 Alfred,Maine
Myrica pennsylvanicum Wax berry NA October 8 Bath,Maine
Nemopanthus mucronatus Mountain Holly May 12 July 21 Alfred,Maine
Ostrya virginiana Hop hornbeam May 20 September 3 Alfred,Maine
Parthenocissus quinquefolia Virginia creeper NA October 16 Alfred,Maine
Polygonatum cuspidatum Japenese knotweed August 31 NA Alfred,Maine
Prunus maritima Beach plum NA August 11 Ogunquit, ME
Prunus virginina Chokecherry May 20 July 4 Alfred,Maine
Quercus ilicifolia Scrub oak May 20 September 24 Kennebunk, Maine
Rhododendron canadense Rhodora May 20 October 14 Alfred,Maine
Rhododendron maximum Great laurel July 1 October 21 Sanford, Maine
Rhus typhina Staghorn sumac July 1 November 9 Alfred,Maine
Rosa multiflora Multiflora rose June 3 NA Alfred,Maine
Rubus allegheniensis Common blackberry June 13 NA Alfred,Maine
Rubus flagellaris Northern dewberry June 14 July 16 Alfred,Maine
Rubus idaeus Red Raspberry June 13 July 16 Alfred,Maine
Rubus odoratus Purple flowering raspberry June 28 August 25 Alfred,Maine
Rubus occidentalis Black raspberry June 13 July 16 Alfred,Maine
Sambucus canadensis Elderberry July 12 August 25 Alfred,Maine
Sambucus racemosa Red elderberry May 12 July 11 Alfred,Maine
Spiraea lattifolia Spiraea June 28 November 10 Alfred,Maine
Spiraea tomentosa Steeplebush July 16 September 26 Alfred,Maine
Vaccinium angustifolium Lowbush blueberry May 11 June 30 Alfred,Maine
Vaccinium corymbosum Highbush blueberry May 11 July 21 Alfred,Maine
Vaccinium myritilloides Velvet leaf blueberry NA July 28 Sanford, Maine
Viburnum acerifolium Maple leaf viburnum June 3 September 10 Alfred,Maine
Viburnum dentatum Arrowood June 13 August 16 Alfred, Maine
Viburnum lantanoides Hobblebush May 12 September 1 Alfred, Maine
Viburnum lentago Nannyberry May 31 September 19 Alfred, Maine
Viburnum nudum var. cassinoides Witherod June 10 August 31 Alfred, Maine
Vitis labrusca Fox grape June 18 August 31 Alfred, Maine
Vitis riparia River grape NA October 6 Damariscotta, Maine

Native Trees

Species Common name Flowering Time Seed Collection Observed Location
Acer rubrum Red maple April 5 May 30 Alfred, Maine
Acer sacharinum Silver maple Mar 31 May 26 Alfred, Maine
Acer saccharum Sugar maple NA September 7 NA
Betula allegheniensis Yellow birch May 1 NA Alfred, Maine
Betula lenta Sweet birch May 1 NA Alfred, Maine
Betula papyrifera Paper birch NA October 20 Alfred, Maine
Betula populifolia Grey birch May 11 October 14 Alfred, Maine
Carya ovata Shagbark hickory May 12 September 29 Alfred, Maine
Castanea dentatum Chestnut NA September 29 Alfred, Maine
Chamaecyparis thyoides Atlantic white cedar NA NA Alfred, Maine
Fagus americana American beech May 13 September 3 Alfred, Maine
Fraxinus americanum White ash May 12 NA Alfred, Maine
Nyssa sylvatica Black tupelo June 18 NA Alfred, Maine
Pinus rigida Pitch pine NA October 8 Alfred, Maine
Pinus strobus White pine June 3 NA Alfred, Maine
Populus tremuloides Quaking aspen April 5 NA Alfred, Maine
Prunus serotina Black cherry May 28 August 10 Alfred, Maine
Prunus pennsylvanicum Fire cherry May 12 NA Alfred, Maine
Quercus alba White oak May 12 September 29 Alfred, Maine
Quercus rubra Red oak May 12 October 14 Alfred, Maine
Tilia americana Basswood July 12 September 1 Alfred, Maine
Tsuga canadensis Hemlock NA October 14 Alfred, Maine
Ulmus americana American elm April 5 May 30 Alfred, Maine

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Last updated on January 16, 2016.