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Castalia odorata (Nymphaea odorata)
Ceanothus americanus
Cock's-comb Gall of Ulmus
Cock's-comb Gall of Ulmus
Desmodium canadense
Desmodium grandiflorum (Desmodium cuspidatum), large, with Miss I. Dorman
Fraxinus lanceolata leaf (above) and Fraxinus nigra leaf (below)
Fraxinus lanceolata leaf (above) and Fraxinus nigra leaf (below)
Fraxinus nigra leaf
Gouty - Vein Gall of Acer
Gouty - Vein Gall of Acer
Hypnum crista-castrensis
Ledum groenlandicum
Ledum groenlandicum, near
Lespedeza capitata
Melilotus alba
Melilotus officinalis
Nelumbo lutea
Panax quinquefolius in fruit
Panax quinquefolius in fruit, near view
Populus Gall causing friction against rock
Rhus vernix
Zizia
The American Jewish World, Volume 30, Number 29, March 20, 1942
The American Jewish World, Volume 30, Number 28, March 13, 1942
The American Jewish World, Volume 30, Number 27, March 6, 1942
Amaranthus blitoides
Amaranthus retroflexus
Amelanchier canadensis
Anemone riparia (Anemone virginiana)
Blueprint for Disaster Defense
Celastrus scandens leaf
Chenopodium hybridum
Crataegus punctata leaf
Cystopteris fragilis on left and Cystopteris bulbifera on right
Dirca palustris leaf
Hamamelis virginiana leaf and flower
Heuchera hispida (Heuchera americana)
Menispermum canadense and fruit
Philadelphus grandiflorus leaf
Physocarpus opulifolius leaf and fruit
Polygonum aviculare
Portulaca oleracea
Potentilla fruticosa
Potentilla fruticosa flower
Prunus pensylvanica leaf
Ribes aureum leaf
Rosa rugosa
Rosa rugosa leaf
Rumex acetosella