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Observations by Gary Fewless for Green Bay WI (Lat.N 44.51° Long. W 88.02° ), except as noted. For flowers lacking conspicuous petals or sepals I define "anthesis" as release of pollen by mature anthers.

May 2001

Observations by Gary Fewless, except as noted

Date Observation (Click on links for photos)
May31 New species in flower, UWGB: Spiderwort (Tradescantia ohiensis), Birds-foot Trefoil (Lotus corniculatus), Orchard Grass (Dactylis glomerata), Red Clover (Trifolium pratense) (Gary Fewless).

New species in flower, UWGB: Alsike Clover (Trifolium hybridum), Hairy Vetch (Vicia villosa), Hoary Alyssum (Berteroa incana), Bottlebrush Sedge (Carex hystericina), American Vetch (Vicia americana), Water Speedwell (Veronica anagallis-aquatica), Silver-weed (Potentilla anserina), Orange Hawkweed (Hieracium aurantiacum), Yarrow (Achillea millefolium), Wild Grape (Vitis riparia), Daisy Fleabane (Erigeron philadelphicus), Canada Anemone (Anemone canadensis) (Gary Fewless).

Carp spawning in lower Green Bay are at peak levels (Gary Fewless).

Eastern Tailed Blue butterfly flying on UWGB, on the newly open Alsike Clover (Gary Fewless).

May29 New species in flower, UWGB: False Solomon's-seal (Smilacina racemosa), Tall Buttercup (Ranunculus acris), Common Cinquefoil (Potentilla simplex), Prairie Alumroot (Heuchera richardsonii), Long-styled Sweet Cicely (Osmorhiza longistylis), Alternate-leaved Dogwood (Cornus alternifolia) (Gary Fewless).
May 21 thru May 28 I was out of town during this period so some new phenology observations were missed. Fortunately (?), this was a cold, rainy period and there were few new plant species flowering. During that interval Kentucky Bluegrass (Poa pratensis) flowered widely. Other conspicuous species flowering within this period include Virginia Waterleaf (Hydrophyllum virgininanum) and Yellow Goat's-beard (Tragopogon dubius). Gary Fewless.
May20 Lupine (Lupinus perennis) and High-bush Cranberry (Viburnum trilobum) in flower, UWGB (Gary Fewless).

The very earliest Kentucky Bluegrass flowers (Poa pratensis) have begun releasing pollen in the City of Green Bay. These are only the plants on extreme sites, such as along the south side of buildings, etc. The general flowering may not begin for several days. For 12 years of phenology observations in Green Bay, the average first day of general flowering (anthesis) for Kentucky Bluegrass is May 29, and the earliest was May 16. If you are allergic to Bluegrass pollen--get ready.

Willow Flycatcher, UWGB (Andy Paulios).

Red-eyed Vireo and Black-billed Cuckoo, Door County, Roy and Charlotte Lukes via wisbirdnet


Monarch Butterfly, east of Laona, Forest County; Tiger Swallowtail, Oneida and Oconto Counties (Andy Paulios).

Canada Warbler, Yellow-Bellied Flycatcher, Black-Billed Cuckoo, Indigo Bunting, Swainson's Thrush, Vilas County; Alder Flycatcher, Oneida County - Thunder Lake Wildlife Area (Andy Paulios).

Joel Trick and others have commented on the relatively large numbers of Red Admiral Butterflies in the Green Bay area this spring. The last big influx of Red Admirals that I can remember in Green Bay was in 1990 (Gary Fewless).


Ruby-throated Hummingbird, Canada Warbler, Summer Tanager, Indigo Bunting, Brown Co, Point Au Sauble (Andy Paulios).

Monarch butterfly, UWGB (Andy Paulios).

Green Frog calling, UWGB (Steve Price).

Nanny-berry (Viburnum lentago), Shooting Star (Dodecatheon meadia) in flower, Trembling Aspen (Populus tremuloides) dispersing fruits, UWGB (Gary Fewless).


Red-osier Dogwood (Cornus stolonifera), Downy Solomon's-seal (Polygonatum pubescens), Golden Alexanders (Zizia aurea), False Toadflax (Comandra umbellata), Rose Twisted-stalk (Streptopus roseus), Cream Wild Indigo (Baptisia bracteata), Cursed Crowfoot (Ranunculus sceleratus, I might have missed the start of this one), all in flower, UWGB (Gary Fewless).

"Spittle Bugs" on plants, UWGB (Gary Fewless).

Short-Billed Dowitcher and Eastern Wood-Pewee, Brown Co., Point au Sauble (Andy Paulios).

A single Monarch butterfly, Point Beach State Forest, Manitowoc Co. (Joel Trick).

Ruby-throated Hummingbird, Shawano (Gretchen Whitehouse).


Green Tiger Beetles (Cicindelidae), UWGB (Gary Fewless). These beetles are

very distinctive each spring--the coloration is "metalic green" and they are often quite numerous about this time on the paths of the Cofrin Arboretum.


Gold-thread (Coptis trifolia), Pennsylvania bitter-cress (Cardamine pensylvanica), Brown County Reforestation Camp, Seaside Crowfoot (Ranunculus cymbalaria), Canada Mayflower (Maianthemum canadense), Wayfaring-tree (Viburnum lantana), Hill's Oak (Quercus ellipsoidalis) City of Green Bay, all in flower (Gary Fewless).

Indigo Bunting, Oconto County, Lakewood (Andy Paulios).

May12 Bell's honeysuckle (Lonicera xbella), UWGB (Gary Fewless). This is the common weedy honeysuckle in our area. Also on UWGB, Chokecherry (Prunus virginiana), May-apple (Podophyllum peltatum), Jack Pine (Pinus banksiana), Cleavers (Galium aparine).

Thyme-leaved speedwell (Veronica serpyllifolia), Worm-seed mustard (Erysimum cheiranthoides) in flower, UWGB (Gary Fewless).

Yellow-Bellied Flycatcher, Swainson's Thrush, UWGB (Andy Paulios)

May10 Columbine (Aquilegia canadensis), Hawthorn (Crataegus mollis), Spring-cress (Cardamine bulbosa), Japanese Barberry (Berberis thunbergii) in flower, UWGB (Gary Fewless).

Least Flycatcher, Red-Eyed Vireo, Semipalmated Sandpiper, Pt au Sauble (Andy Paulios).

Jacob's-ladder (Polemonium reptans) in flower, UWGB (Gary Fewless).


Nodding Trillium (Trillium cernuum) and Wild Geranium (Geranium maculatum) in flower, Rat River Wildlife Area, Winnebago County (Joel Trick).

Bishop's-cap (Mitella diphylla), Red Baneberry (Actaea rubra), Wild Geranium (Geranium maculatum), Prickly Wild Gooseberry (Ribes cynosbati), Apple (Malus pumila) all in flower, UWGB (Gary Fewless).

Wood Frog tadpoles, Nesting Four-toed salamanders, Baileys Harbor, Door Co. (Steve Price).

Black-Billed Cuckoo, Pt Au Sauble (Andy Paulios), Black-Bellied Plover, Dowitcher spp., Ruddy Turnstone, Brown Co., Pt Au Sauble (Jay Roberts).

May07 Warblers: Tennessee, Nashville, Cape May, Yellow-rumped, Black-throated Green, Pine, Palm, Bay-breasted, Mourning and Common Yellowthroat in Door County (Nolan Pope via wisbirdnet).

Lilac (Syringa vulgaris), UWGB; Bishops-cap (Mitella diphylla), Baird Creek; Pussy-toes (Antennaria howellii), Allouez (Gary Fewless).

Whip-poor-will, Oconto County - East of Laona; Golden-Winged Warbler, Blackburnian Warbler, Florence County; Solitary Sandpiper, Black-Backed Woodpecker, Vilas County (Andy Paulios).


Crack Willow (Salix fragilis), Hop Hornbeam (Ostrya virginiana), Starry False Solomon's-seal (Smilacina stellata), Lily-of-the-valley (Convallaria majalis), UWGB (Gary Fewless).

Blue Phlox (Phlox divaricata), Jack-in-the-pulpit (Arisaema triphyllum), False Rue Anemone (Isopyrum biternatum), Bishops-cap (Mitella diphylla) all in flower, Rat River Wildlife Area, Winnebago County (Joel Trick).

Blue Cohosh (Caulophyllum thalictroides), Town of Cooperstown, Manitowoc Co. (Joel Trick)

Magnolia Warblers, Forest and Vilas Counties (Andy Paulios).

May04 Juneberry (Amelanchier sanguinea and Amelanchier spicata, Paper Birch (Betula papyrifera), Wild Plum (Prunus americana), Fire Cherry or Pin Cherry (Prunus pensylvanica), American Black Currant (Ribes americanum), Sugar Maple ( Acer Saccharum), Golden Currant (Ribes odoratum), Small flowered Crowfoot (Ranunculus abortivus), Jack-in-the-pulpit (Arisaema triphyllum) all in flower, UWGB (Gary Fewless).

Red-headed Woodpecker, Oconto Co (Andy Paulios).

13-lined Ground Squirrel, UWGB (Joel Whitehouse)

A dramatic growth of leaves in response to the rain gave us a rapid flush of green in City of Green Bay. Norway Maple (a major street planting), Crack Willow, Box Elder and Trembling Aspen are notably green, although the leaves are not full size.

Eastern Gray Tree Frogs calling, Barkhausen Waterfowl Preserve, Brown Co. (Andy Paulios).


Missouri gooseberry (Ribes missouriense), Yellow Violet (Viola pubescens), Red Elderberry (Sambucus pubens), Green Ash (Fraxinus pennsylvanica), UWGB (Gary Fewless).

Pussytoes (Antennaria neglecta) flowers opening, Shawano (Joel Whitehouse).

Ovenbird, Lincoln's Sparrow, Magnolia Warbler, Ken Euers Wildlife Area, (Andy Paulios).

Glossy Ibis!!, Oconto Marsh (via WISbirdnet).


Common Blue Violet (Viola sororia), Wild Strawberry (Fragaria virginiana), Shepherd's Purse (Capsella bursa-pastoris), Field Pennycress (Thlaspi arvense), UWGB (Gary Fewless).

Yellow Violet (Viola pubescens), Squirrel corn (Dicentra canadensis), Manitowoc Co, Cooperstown area (Joel Trick).

Marsh Wren, Least Sandpipers, Willet, White-Crowned Sparrow, Brown Co, Ken Euers Wildlife Area (Andy Paulios).

Cliff Swallows, UWGB (Andy Paulios).

Nashville Warbler, Sedge Wrens and Solitary Sandpiper, Vilas County (Jim Baughman).

Clay-colored Sparrows, UWGB (Bob Howe).

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Last updated on May 20, 2015