Plants

Flower Guide: Wild Flowers East of the Rockies (Revised and with New Illustrations)

Spring in a Shropshire Abbey

Young Folks' Nature Field Book

Language of Flowers

Street Trees

History of Botany (1530–1860)

Fruits of the Hawaiian Islands

Palm trees of the Amazon and their uses

Identification of the Larger Fungi

Forest Trees of Illinois

A Synopsis of the British Mosses

Herbals, Their Origin and Evolution

Poison-ivy, Poison-oak and Poison Sumac: Identification, Precautions and Eradication

Freak trees of the State of New York

The Oak: A Popular Introduction to Forest-botany

A synopsis of the palms of Puerto Rico

Floral Illustrations of the Seasons

Forestry for Farmers

Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana)

Summer Flowers of the High Alps