| Date |
Flower |
Family |
Scientific Name |
Photo |
Caption |
| 2002-03-13 | Skunk Cabbage | - Calla-lily Family | Lysichitum americanum |  | Yurok Loop Trail, Redwood National Park - - - March 13, 2002 |
| 2003-06-30 | Skullcap, Narrowleaved | - Mint Family | Scutellaria angustifolia |  | Little Blitzen Gorge, Steens Mountain - - - June 30, 2003 |
| 2001-04-21 | Shooting Star | - Primrose Family | Dodecatheon hendersonii |  | |
| 2001-05-17 | Serviceberry | - Rose Family | Amelanchier alnifolia |  | Metolius River - - - May 17, 2001 |
| 2002-07-03 | Selfheal | - Mint Family | Prunella vulgaris |  | North Fork John Day Wilderness - - - July 3, 2002 |
| 2009-07-25 | Searocket | - Mustard Family | Cakile maritima |  | Seal Rock Beach - - - - - July 25, 2009 |
| 2010-02-21 | Scorpionweed | - Waterleaf Family | Phacelia crenulata |  | Buckskin Mountain State Park, Arizona - - - February 21, 2010 |
| 2005-03-29 | Scalebud | - Sunflower Family | Anisocoma acaulis |  | Mojave Desert - - - March 17, 2005 |
| 2002-03-31 | Saxifrage, Western | - Saxifrage Family | Saxifraga occidentalis |  | Catherine Creek, Columbia Gorge National Scenic Area - - - March 31, 2002 |
| 2004-08-09 | Saxifrage, Tolmie | - Saxifrage Family | Saxifraga tolmiei |  | Hidden Lake Peak, Mt Baker-Snoqualmie National Forest - August 9, 2004 |
| 2003-02-05 | Salt-and-pepper | - Carrot Family | Lomatium piperi |  | Catherine Creek, Columbia Gorge National Scenic Area - - - February 5, 2003 |
| 2003-05-10 | Salsify, Yellow | - Sunflower Family | Tragopogon dubius |  | Klickitat Trail - - - May 10, 2003 |
| 2004-05-08 | Salmonberry | - Rose Family | Rubus spectabilis |  | Cascade Head - - - April 1, 2003 |
| 2002-10-01 | Salal | - Heath Family | Gaultheria shallon |  | Waxmyrtle Trail, Siltcoos Recreation Area - - - October 21, 2007 |
| 2002-04-04 | Rusty Popcorn Flower | - Borage Family | Plagiobothrys nothofulvus |  | Columbia River Gorge - - - April 4, 2002 |
| 2009-07-25 | Rose, Wild | - Rose Family | Rosa nutkana |  | Seal Rock, Oregon Coast - - - - - July 25, 2009 |
| 2009-07-12 | Rose, Pearhip | - Rose Family | Rosa woodsli |  | Metolius River Trail - - - - - September 26, 2005 |
| 2004-05-22 | Rose, Baldhip | - Rose Family | Rosa gymnocarpa |  | Baskett Slough National Wildlife Refuge - May 20, 2004 |
| 2002-06-22 | Rhododendron | - Heath Family | Rhododendron macrophyllum |  | Timothy Lake, Mt Hood National Forest - - - June 22, 2002 |
| 2012-08-03 | Rangers Button | Carrot Family | Sphenosciadium capitellatum |  | Spring Creek - Collier Memorial State Park, Oregon - - - August 3, 2012 |
