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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 2008 Mouse-over the photo for the identities of the three subjectsbellwort, mayapple, monarch

May 31

The canopy is nearly full in Mahon woods in the Cofrin Arboretum at UW-Green Bay.

Mosquitoes are now fully obnoxious in wetter portions of Mahon Woods, UWGB.

Spittlebugs are conspicuous on plants now, UWGB.

Hydrophyllum virginianum (Virginia waterleaf)is in flower in Mahon Woods, UWGB.

Hieracium aurantiacum (orange hawkweed) and Crepis tectorum (hawk's beard) are in flower in City of Green Bay.

Geranium maculatum (wild geranium) is at about peak flower now.

May 30 Cornus stolonifera (red-osier dogwood) has begun to flower.
May 28 Podophyllum peltatum (mayapple) has begun to flower.
May 25 Streptopus roseus (rose twisted stalk) has begun to flower.
May 23

The early individuals of Prunus virginiana (choke cherry) are in flower, UWGB and elsewhere in the City of Green Bay.

Green Frogs are calling in PrairiePond on UW-Green Bay's Cofrin Arboretum.

May 22

First Hummingbird sighting this morning. The ornamental crabapple tree is blooming and the hummer was there for breakfast, City of Green Bay (Dave Parsons).

Lonicera xbella (showy honeysuckle) is in flower. This is an invasive species and it is abundant in the Green Bay (City) area.

May 21

Prunus virginiana (chokecherry) in flower, Allouez. I saw a single plant in flower on the Niagaran escarpment at UWGB on May 17. Several species flower much earlier on the shallow soils over limestone, perhaps because the shallow soils warm up earlier.

First day in flower on UWGB for: Aquilegia canadensis (columbine), Lupinus perennis (lupine) and Maianthemum canadense (Canada mayflower).

Yesterday was the first day that I noticed a trace of pink in the petals of Trillium grandiflorum (great white trillium) and by today it was clearly evident in a small number of individuals. The petals are pure white when fresh and begin to turn pink as they senesce. Since there are other trilliums which have petals colored pink or red, people sometimes mistake the late pink stage of Trillium grandiflorum for another species. The first fully open flowers were noted May 5.

Populus tremuloides (quaking aspen) has begun to disperse mature fruit, UWGB. P. tremuloides usually starts to release the conspicuous fluffy seeds about 3 weeks earlier than the much more notorious "cottonwoods" (Populus deltoides).

May 20 First day of flower (anthesis) for Alopecurus pratensis (meadow foxtail), UWGB. This alien species is also increasing in the Green Bay area, preferring wet roadside ditches, but also in a variety of moist, grassy areas in mostly full sun. It looks a little like Phleum pratense (timothy), but begins to flower earlier (May 13 vs. June21 for Phleum) and prefers wetter sites.
May 19

First American Robin fledgling observed walking around outside my office window, Town of Scott, Brown County (Joel Trick).

I saw my first Junebug today, UWGB.

First day of flower, UWGB: Actaea rubra (red baneberry) and Viburnum lantana (wayfaring tree, planted, but away from buildings and not tended. This species is escaping fairly commonly in City of Green Bay).

May 18

First day of flower for Berberis thunbergii (Japanese barberry), UWGB.

My first mosquito bite of the season, Brown County, Town of Suamico.

May 17

American toads "singing" in large numbers on Prairie Pond, UW-Green Bay (April 30 last year).

First day for fully open flowers of Maianthemum stellatum (formerly Smilacina stellata, starry false solomon's-seal), UWGB.

May 16

Although different trees leaf out at different times, by today most of the forests in the Cofrin Arboretum are conspicuously green in the interior.

First Tiger Swallow-tail butterfly today, UWGB.

First day of open flowers for Maianthemum stellatum (=Smilacina stellata; starry false Solomon's-seal), UWGB.

First mosquito of the season, in Mahon woods, UWGB, but not biting.

May 15

Saw my first Monarch butterfly flying through the yard today, City of Green Bay (Dave Parsons).

Salix exigua (sand bar willow) in flower (anthesis), UWGB.

May 14 Zanthoxylum americanum (prickly ash) in flower (anthesis), UWGB.
May 13

Ribes americanum (American black currant) and Thalictrum dioicum (early meadow rue) in flower, UWGB).

First day of flower for Geranium maculatum (wild geranium), UWGB, but only a couple of flowers. [as of 0516, there are still very few flowers open, gf]

May 12 Ribes triste (swamp red currant), Rubus pubescens (dwarf red raspberry), Viola conspersa (dog violet), Mitella diphylla (bishop's-cap), Chrysosplenium americanum (American golden saxifrage).
May 11

First day of flower for Ribes americana (American black currant), Ribes cynosbati (gooseberry), Ribes missouriense (Missouri gooseberry) and Prunus americana (wild plum).

Also the first day of flower for Aesculus glabra (Ohio buckeye), a planted tree (UW-Green Bay)..

May 10

This is the first day that Canada Geese brought new goslings to the pond across from our house (Brown County, Allouez).

Fragaria virginiana (wild strawberry) in flower, Oconto County, Town of Abrams (Juniper Sundance).

May 08

Ranunculus abortivus (small-flowered buttercup) in flower.

Controlled burns were performed on 3 parcels of prairie on UW-Green Bay's Cofrin Arboretum. The burns help to control alien plants and invading trees and shrubs. In the absence of fire or other disturbance the prairies would eventually become forested.

May 07 Sambucus pubens (red elderberry), Ribes rubrum (garden red currant), Betula papyrifera (paper birch) in flower, UW-Green Bay.
May 06

Ribes odoratum (golden currant, planted and persisting on old homesite) in flower, UWGB.

Leaves of Corylus cornuta (beaked hazelnut) and Acer rubrum (red maple) opening conspicuously, Oconto County, Town of Abrams (Juniper Sundance).

May 05

First orchard oriole of the year this morning, Town of Cooperstown, Manitowoc County (Joel Trick).

First day of fully open flowers for Trillium grandiflorum (great white trillium), UW-Green Bay' Cofrin Arboretum.

May 04 Luzula acuminata (wood rush), Lonicera canadensis (American fly honeysuckle) and Viola sororia (common blue violet) in flower . Young leaves ("fiddleheads") of Pteridium aquilinum (bracken fern) are emerging, Oconto County, Town of Abrams (Juniper Sundance).
May 03 A good push of warblers this morning with numerous yellow-rumped warblers and a few palm warblers. New arrivals here today include ruby-throated hummingbird, Baltimore oriole and house wren, Town of Cooperstown, Manitowoc County (Joel Trick).
May 01

Erythronium americanum (yellow trout lily), Ranunculus hispidus (rough buttercup) in flower, UWGB. Also Barbarea vulgaris (yellow rocket) in flower in lawn near buildings.

Cabbage butterfly, UW_Green Bay (Juniper Sundance).

Painted turtle crossing a road, Oconto County, town of Pensaukee (Juniper Sundance).

Panax trifolius and Viola macloskeyi (small white violet) in flower, Oconto County, Town of Abrams (Juniper Sundance).

Gray Tree Frog calling, Oconto County, Town of Pensaukee (Tom Erdman).

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Last updated on May 20, 2015