Senior Instructor Emeritus,
Taxonomy of the Hydrophyllaceae; ecology and taxonomy of Sidalcea; floristics of Oregon.
Description of Research
I am interested in the taxonomy of the Hydrophyllaceae, the waterleaf family, which has its greatest diversity in western North America. The species in the genus Sidalcea, in the mallow family, are quite variable, difficult to identify, often restricted in distribution with some being rare. Oregon's flora is one of the most diverse in the nation and many parts of the state are still not well known botanically.
BOT 410 Internship
BOT 414/514 Agrostology
BOT 416/516 Aquatic Botany
BOT 425/525 Flora of the Pacific Northwest
Halse, R.R. 1993. Draperia, Emmenanthe, Eriodictyon, Eucrypta, Hesperochiron, Hydrophyllum. pp. 683-687 in The Jepson Manual, J.C. Hickman (ed.), University of California Press.
Glad, J.B., R.R. Halse and R. Mishaga. 1994. Observations on the distribution, abundance and habitats of Sidalcea nelsoniana Piper (Malvaceae) in Oregon. Phytologia 76:307-323.
Halse, Richard R. and Judith B. Glad. 2001. Flora of Walker Flat, Yamhill County, Oregon. Kalmiopsis 8:17-24.
Rao, S., M. Scherr, L. Royce, W. Stephen, R. Halse, A. Soeldner. 2007. Bees and pollination: A "scientist" experience for rural youth in Oregon . American Entomologist 53:74-77.
Valentine, B., W. Rumbeiha, T. Hensley, R. Halse. 2007. Arsenic and metaldehyde toxicosis in a beef herd. J. Vet. Diagn. Invest. 19:212-215.
Dennis, L. J. and R. Halse. 2008. Aquatic and Wetland Plants of Oregon . Uncial Press, Portland , OR . 297 pp.