Keywords: Rhynchospora macra AWP-SW.png en Rhynchospora macra - Large beaksedge<br>d top of plant X 1;<br>e scale X 15;<br>f achene with usual bristles X 15;<br>g achene with unusual smooth bristles X 15 1972-01 Aquatic and Wetland Plants of the Southwestern United States Water Pollution Control Research Series Environmental Protection Agency Research and Monitoring January 1972 Page 475 Fig 245 Donovan S Correll Southern Methodist University and Helen B Correll Botanical Editor and Research for EPA Illustration courtesy of R K Godfrey other versions PD-USGov Rhynchospora macra Aquatic and wetland plants of southwestern United States |