Plants with flowers not white, yellow, or green
 Butomus umbellatus (Flowering Rush) |
 Calypso bulbosa (Venus Slipper) |
 Calystegia sepium (Hedge Bindweed) |
 Campanula rapunculoides (Creeping Bellflower) |
 Campanula rotundifolia (Harebell) |
 Carduus nutans (Nodding Thistle) |
 Castilleja coccinea (Scarlet Paintbrush) |
 Castilleja miniata (Red Paintbrush) |
 Centaurea stoebe (Spotted Knapweed) |
 Chaenorhinum minus (Small Snapdragon) |
 Chamerion angustifolium (Fireweed) |
 Chenopodium capitatum (Strawberry Blite) |
 Chenopodium rubrum (Red Goosefoot) |
 Chimaphila umbellata (Prince's Pine) |
 Cirsium arvense (Canada Thistle) |
 Cirsium drummondii (Short-stemmed Thistle) |
 Cirsium flodmanii (Flodman's Thistle) |
 Cirsium muticum (Swamp Thistle) |
 Cirsium undulatum (Wavy-Leaved Thistle) |
 Cirsium vulgare (Bull Thistle) |
 Clematis occidentalis (Purple Clematis) |
 Collinsia parviflora (Blue-eyed Mary) |
 Collomia linearis (Narrow-Leaved Collomia) |
 Comarum palustre (Marsh Cinquefoil) |
 Corallorhiza striata (Striped Coralroot) |
 Corallorhiza maculata (Spotted Coralroot) |
 Corydalis sempervirens (Pink Corydalis) |
 Corylus cornuta (Beaked Hazelnut) |
 Cyclachaena xanthifolia (False Ragweed) |
 Cynoglossum virginianum (Wild Comfrey) |
 Cypripedium acaule (Stemless / Pink Lady's Slipper) |
 Cypripedium arietinum (Ram's Head Lady's Slipper) |
 Cypripedium reginae (Showy Lady's Slipper) |
 Dalea purpurea (Purple Prairie-Clover) |
 Dalea villosa (Hairy Prairie-Clover) |