Howellia
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- Urbanizing Flora of Portland, Oregon, 1806-2008
- Higher Level Phylogeny and Evolutionary Trends in Campanulaceae Subfam
- Draft Comprehensive Conservation Plan and Environmental Assessment Red Rock Lakes National Wildlife Refuge
- Technical Note No. 51. Threatened, Endangered, Candidate And
- Sage Notes March 2018
- Scappoose Bay Conservation Plan
- BORING LAVA DOMES Supplement to the Johnson Creek Basin Protection Plan
- Field Guide to MT Wetland & Riparian Ecological Systems
- Amphibian Cascade Torrent Salamander Rhyacotriton Cascadae
- Climate Change Vulnerability Index Report Howellia Aquatilis
- Appendix E. Prairie Conservation Strategy
- Howellia Aquatilis) at the Harvard–Palouse River Flood Plain Site, Idaho: Fifth-Year Results
- Howellia Aquatilis A
- Special Vascular Plants, Bryophytes, and Lichens List
- 1741-7007-7-82.Pdf
- Appendix G Species and Habitat Information
- Portland Plant List
- WATER HOWELLIA and Wetland Indicator Values)