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Drummond's Rockcress (Boechera drummondii), family Brassicaceae (Mustard).
Plant location: Sighted during a car trip over Guannella Pass, Colorado, on June 10, 2009.
Bloom season: March through July. Habitats include gravelly, rocky slopes, forest openings, roadsides. -
Plains Larkspur -or- Blue Larkspur -or- Carolina Larkspur (Delphinium carolinianum), family Ranunculaceae (Buttercup). Some botanists now place delphinium in the family Helleboraceae (Hellebore).
Plant location: Discovered in the Pueblo Colorado area on May 31, 2011. GPS coordinates: N38°02.852 W104°43.469 - Elevation: 5410'.
Bloom season: May through July in Colorado. -
Showy Townsendia -or- Easter Daisy -or- Largeflower Townsend Daisy (Townsendia grandiflora), Asteraceae (Aster/Sunflower).
Plant location: Sighted at Roxborough Park in Colorado on July 21, 2010. GPS coordinates: N39°25.222 W105°03.582 - Elevation: 6524'.
Bloom season: May through August. The sparse foliage and thick, easily seen, stems are characteristic of this species. -
Stickywilly -or- Common Bedstraw -or- Goose Grass -or- Goosegrass -or- Cleavers -or- Catchweed Bedstraw -or- Cleaverwort -or- Scarthgrass -or- White Hedge (Galium spurium), family Rubiaceae (Bedstraw/Madder).
Plant location: Seen hiking in Roxborough Park (Colorado) on May 17, 2011. GPS coordinates: N39°25.460 W105°03.932 - Elevation: 6208'.
Bloom season: May through September. -
Stemless Townsend Daisy (Townsendia exscapa), family Asteraceae (Aster/Sunflower). 
This plant was used as a gynecological aid by Native Americans.
Plant location: Sighted on March 30, 2011 at Lake Rita Blanca - Dalhart Texas. Note the absence of any stem whatsoever.
Bloom season: March through May. -
Whitetop -or- Hoary Cress (Cardaria draba), family Brassicaceae (Mustard).
Plant location: Found in the Holcim Natural area near Florence Colorado on May 4, 2011 - GPS coordinates: N38°23.806 W105°01.753 - Elevation: 5046'.
Bloom season: March through May. -
Fendler's Waterleaf -or- White Waterleaf (Hydrophyllum fendleri), family Hydrophyllaceae (Waterleaf).
Plant location: The photos of this common plant are from two recent sightings; flower and foliage photographed at Roxborough Park Colorado on May 17, 2011 - GPS coordinates: N39°25.550 W105°03.873 - Elevation: 6156'. The plant view is from a sighting in the Rocky Mountain foothills at Hwy72 and Plainview Rd on May 25, 2011.
Bloom season: May through August. -
Sweetflower Rockjasmine -or- Alpine Rockjasmine (Androsace chamaejasme), family Primulaceae (Primrose).
Plant location: Enjoyed seeing these tiny charmers in the GOliath Nature Area, Mt. Evans, Colorado. GPS coordinates: N39°38.554 W105°35.574 - Elevation: 11,533'.
Bloom season: June through August. -
Nevada Sweet Pea -or- White-Flowered Peavine (Lathyrus lanszwertii, also called leucanthus), family Fabaceae (Pea/Bean)
Plant location: Sighted hiking Roxborough Park Colorado on May 17, 2011. GPS coordinates: N39°25.701 W105°04.157 - Elevation: 6201'.
Bloom season: May through August -
Cutleaf Daisy -or Dwarf Mountain Fleabane -or- Trifid Mountain Fleabane -or White Daisy (Erigeron compositus), family Asteraceae (Aster/Sunflower).
Plant location: Photographed in the Rocky Mountain National Park, Colorado, on June 8, 2011 - GPS coordinates: N40°23.599 W105°37.611 - Elevation: 8977'.
Bloom season: June through August. Foothills to Subalpine zone. -
Drummond's Milkvetch (Astragalus drummondii), family Fabaceae (Pea/Bean).
Plant location: Sighted in two locations: Hwy 128 and also along Hwy 93 - Colorado on May 11, 2011. Found in the following states: CO, ID, MT, ND, NE, NM, OR, SD, UT, WY.
Bloom season: June and July. Note the extremely hairy foliage, an identifying characteristic of the species. -
Dutch Clover -or- White Clover (Trifolium repens), family Fabaceae (Pea/Bean).
Plant location: Photographed in Yellowstone National Park, on August 30, 2009 - GPS coordinates: N44°34.707 W110°22.788 - Elevation: 7857'.
Bloom season: June through August.