Plants

Ferns of Hawaii National Park

Fossil Forests of the Yellowstone National Park

The Study of Plant Life

The Botanical Lore of the California Indians with Side Lights on Historical Incidents in California

Low-maintenance Perennial Combinations

Orchid Care 101

Wildlife in Your Garden

The Double Garden

Spring Wild Flowers

The flowering plants of Africa

Forest Trees and Forest Scenery

Ilex Cassine: The Aboriginal North American Tea

A handbook of systematic botany

Sex on the Kitchen Table

Birds and Blooms of the 50 States

How to Know the Ferns

A Specimen of the Botany of New Holland

The Genus Pinus

Trees: A Woodland Notebook

Lichens