Last Sunday there was an Urban Nature Walk in section of Franklin Park called "the Wilderness." It's a wooded puddingstone hill, originally intended as a place where city dwellers could experience what it looked like in the area before European Settlement. Here Pete has climbed a puddingstone ledge.
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There are a few of these trees around town, and they don't seem to be any of the typical legumes (locusts) but maybe it's some kind of mesquite or a close relative? Anyone know?

On this day in 365 Urban Species: Oyster mushroom.

says_bomb commented suggesting I check out the area opposite International Place, where the Big Dig contractors have built/planted an arboretum. He just emailed me, with the planting list! Sounds pretty nice. You should check it out, I will:

Qty Botanical Name Common Name
1 Picea abies Norway Spruce
2 Carpinus caroliniana American Hornbeam
2 Larix laricina American Larch
1 Acer ginnala Amur Maple
1 Magnolia acuminata 'Butterflies' Cucumber Magnolia
2 Amelanchier arborea 'Autumn Brilliance' Downy Serviceberry
1 Carpinus betulus European Hornbeam
2 Prunus x incam 'Okame' Okame Cherry
1 Tilia tomentosa 'Sterling Silver' Silver Linden
1 Aesculus hippocastanum Horsechestnut
1 Cercidiphyllum japonicum Katsura
3 Liquidambar styraciflua American Sweetgum
22 Ulmus 'Accolade' Accolade Elm
1 Platanus x acerifolia 'Bloodgood' London Plane Tree
1 Ginkgo biloba Ginkgo
1 Sophora japonica Scholar Tree
1 Fagus sylvatica 'Tricolor' Tricolor European Beech
1 Castanea mollisima Chinese Chestnut
1 Platanus occidentalis Sycamore
3 Liriodendron tulipifere Tulip Tree
1 Fraxinus americana "Autumn Purple" White Ash
3 Cladrastis lutea Yellow-wood
1 Ilex opaca American Holly
6 Kalmia latifolia 'Olympic Wedding' Mountain Laurel
2 Koelreuteria paniculata Golden Rain Tree