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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 2009eastern hemlock

Mouse-over the photo for the identity of the subject

May 17

First emerging dragon fly, Beaverpond Basket-tail (Epitheca canis), 4-5 observed; one Clouded Sulfur Butterfly and one returning Monarch butterfly. Brown County Reforestation Camp (Ron Eichhorn/Joan Berkopec).

May 14 Syringa vulgaris (lilac) and Veronica serpyllifolia (thyme-leaved speedwell) in flower.
May 12

The weather station for Green Bay recorded a low temperature of 34° F this morning, though I did not hear of any local frost. Florence WI reported 30° and Hiles 31°.

In spite of the cool nights, the days yesterday and today were mild and these young Canada geese on our local pond (Allouez) are a welcome site for those of us who found the winter a bit long.

Rubus pubescens (dwarf red raspberry), Ribes missouriense (Missouri gooseberry), Convallaria majalis (lily of the valley), Maianthemum stellatum (starry false Solomon's-seal) and Ribes americanum (American black currant) in flower.

Junebugs out and about, Oconto County, Town of Pensaukee (Tom Erdman).

May 11

Another cold night in the northeastern part of Wisconsin. Laona had a low of 29° F, Lakewood 28° and Florence reach 26°. At these temperatures we must admit this is "freeze" rather than "frost".

Thalictrum dioicum (early meadow rue) and Salix fragilis (crack willow) in flower.

May 10

There was frost in scattered areas of northern Wisconsin this morning, with 30° F in Laona (Forest County).

Salix exigua (sand bar willow) in flower.

May 7 A mild day in Wisconsin and many plants began to flower. Among the most conspicuous are several Amelanchiers (juneberries) in Brown County where A. sanguinea, A. laevis and A. interior all began to flower. It was also the first day on UWGB for Prunus pens
May 6 First returning individuals of Great Crested Flycatcher and Indigo Bunting, Town of Cooperstown, Manitowoc County (Joel Trick).
May 4

American toads trilling, Waukechon Township, Shawano Co. (Joel Whitehouse).

American Bittern calling, Pensaukee, Oconto County (Towm Erdman).

First returning individuals of Ruby-throated Hummingbird, Town of Cooperstown, Manitowoc County (Joel Trick).

May 3

After a good day yesterday, today's sunny weather with a high temperature of 67° F resulted in a flood of new plant species that had been suppressed by recent cool and cloudy weather. Among the new flowering species are: Viola pubescens (yellow violet),Viola labradorica (dog violet), Viola sororia (common blue violet), Trillium grandiflorum (great white trillium), Ranunculus hispidus (bristly buttercup), Ranunculus abortivus (small-flowered crowfoot).

The weedy alien plant, Medicago lupulina (black medick) has also begun to flower.

It is also the first day I've seen cabbage butterflies in the woods at UWGB, though they probably have been around gardens before this. Also the first day I've seen the distinctive metallic green beetles (whose true identity I don't know) on trails in the Cofrin Arboretum.

First returning individuals of Baltimore Oriole, Town of Cooperstown, Manitowoc County (Joel Trick).

May 2

First day of flower for Anemone quinquefolia (wood anemone) and Erythronium americanum (yellow trout lily) in woods at UW-Green Bay's Cofrin Arboretum. Also the first day of flower (anthesis) for Fraxinus pennsylvanica (green ash) in fencerows and abandoned fields, etc.

It is also the first day of flowering on the UW-Green Bay campus for the following weedy species of sunny sites: Cerastium fontanum (mouse-ear chickweed), Thlaspi arvense (field pennycress) and Barbarea vulgaris (yellow rocket).

In Forest and northern Oconto County, Dirca palustris (leatherwood) is in full flower.

First returning individuals of White-crowned Sparrow, Town of Cooperstown, Manitowoc County (Joel Trick).

May 1

First returning individuals of House Wren and Orchard Oriole, Town of Cooperstown, Manitowoc County (Joel Trick).

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Last updated on May 20, 2015