Black cottonwoods are in the willow family and found near rivers, sandbars and other wet areas at low to middle elevations.
They have deciduous, broad leaves, which are round to heart shaped and glossy dark green on the top side. Leaf buds are conical, long, narrow and sticky. they emit a balsam scent in the spring as they open.
Seeds are in capules, white lots of white cotton hairs. In spring it often looks like it has snowed, but it's the wind blown seeds that have been swept into a pile. Male and female parts (catkins) are on seperate plants. Cottonwoods also reproduce very easily vegetatively (by cuttiongs, either on purpose or by mother nature)
The bark is grey, becoming thick and wrinkled as the tree grows older.
The lightweight wood is used for plywood and paper products. Live trees are often used for wind breaks. Cottonwoods can grow to be very tall and their trunks can be up to six feet in diameter.
Historically (ethnobotanically) Cottonwood has been used as firewood and the making of salves.
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You are looking for a small square tupperware container. There is room for small trinkets and TBs. I have started the container with beads, stickers, ant and a ring. Note: I do check my cache log books. No signature = no find