Books by Rydberg, Per Axel
Some Senecioid genera
Some Senecioid genera
Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, North Dakota, and British Columbia
Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and the neighboring parts of Nebraska, South Dakota, and British Columbia
Key to the Rocky Mountain flora
Flora of the Rocky Mountains and adjacent plains
Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, and British Columbia
List of plants collected on th
List of plants collected on the Peary Arctic Expedition of 1905-06 by Dr. L.J. Wolf, and of 1908-09 by Dr. J.W. Goodsell
Scandinavians who have contrib
Scandinavians who have contributed to the knowledge of the flora of North America
Flora of Colorado
Further studies on the Potenti
Further studies on the Potentilleae
The American species of Limnor
The American species of Limnorchis and Piperia, north of Mexico
Catalogue of the flora of Montana and the Yellowstone National Park
Studies on the Rocky Mountain flora
Studies on Rocky Mountain flora
A report upon the grasses and
A report upon the grasses and forage plants of the Rocky Mountain region
Flora of the Black Hills of South Dakota
Notes on Potentilla
Notes on Potentilla
The North American species of Physalis and related genera
Flora of the sand hills of Nebraska