| Date |
Flower |
Family |
Scientific Name |
Photo |
Caption |
| 1973-05-12 | Vanilla Leaf | - Barberry Family | Achlus triphylla |  | French Pete Creek- - - May 12, 1973 |
| 2003-08-30 | Twistedstalk, Rosy | - Lily Family | Streptopus roseus |  | Tombstone Pass, Willamette National Forest - - - August 30, 2003 |
| 2009-07-28 | Twisted-stalk, Clasping | -Lily Family | Streptopus amplexifolius |  | Spencer Creek Nature Trail, Beverly Beach State Park - July 28, 2009 |
| 2001-07-21 | Twinflower | - Honeysuckle Family | Linnaea borealis |  | Iron Mountain, Willamette National Forest - - July 21, 2001 |
| 2007-07-10 | Twinberry | - Honeysuckle Family | Lonicera involucrata |  | Spencer Creek Nature Trail, Beverly Beach State Park - - July 29, 2009 |
| 2002-03-29 | Trillium, Western | - Lily Family | Trillium ovatum |  | Spencer Butte - - - March 29, 2002 |
| 2003-04-17 | Trillium, Giant | - Lily Family | Trillium chloropetalum |  | McDonald-Dunn Forest - Corvallis, Oregon - - - April 17, 2003 |
| 2003-03-15 | Toothwort, Oaks | - Mustard Family | Cardamine pulcherrima |  | Catherine Creek, Columbia Gorge National Scenic Area - - March 15, 2003 |
| 2003-03-08 | Toothwort, Coast | - Mustard Family | Cardamine integrifolia |  | Dimble Hill, March 8, 2003 |
| 2011-01-30 | Thornbush, Fremont | Nightshade Family | Lycium freemontii |  | Buckskin Mountain State Park, Arizona --- January 30, 2011 |
| 2008-01-27 | Thornbush, Anderson | Nightshade Family | Lycium andersonii - |  | Casa Grande Mountains, Arizona - - - - January 27, 2008 |
| 2003-07-04 | Thistle, Steens Mountain | - Sunflower Family | Cirsium peckii |  | Big Indian Gorge, Steens Mountain - - - July 4, 2003 |
| 2003-07-12 | Thistle, Mountain | - Sunflower Family | Cirsium callilepis |  | Pyramids Trail, Willamette National Forest - - July 12, 2003 |
| 2002-08-25 | Thimbleberry | - Rose Family | Rubus parviflorus |  | Elk Lake, Willamette National Forest - - - August 25, 2002 |
| 2002-08-27 | Tea-berry | - Heath Family | Gaultheria ovatifolia |  | Park Creek , Willamette National Forest - - - August 27, 2002 |
| 2018-07-05 | Tarweed, Showy | Sunflower | Madia elegans |  | Salem Audubon Nature Reserve - - - July 5, 2018 |
| 2011-06-03 | Tarweed | Sunflower Family | Madia elegans ssp. vernalis |  | Kenneth Denman Wildlife Management Area - - - June 3, 2011 |
| 2010-08-04 | Tansy Ragwort | Sunflower Family | Senecio jacobaea |  | Camp Adair - - - - - August 4, 2010 |
| 2010-09-12 | Tansy | Sunflower Family | Tanacetum vulgare |  | Luckiamute State Natural Area - - - - September 12, 2010 |
| 2005-03-15 | Tackstem, White | - Sunflower Family | Calycoseris wrightii |  | Salton Sea, Colorado Desert - - - March 15, 2005 |
