Compositae/ Asteraceae

Helianthus annuus - sunflowers in cultivation

Erigeron - white ray florets; yellow disk florets

Aster - purple rays; yellow disks; involucral bracts at base of capitulum

Cirsium (thistle) - disk florets only; note spiny involucral bracts

Balsamorhiza - habit

Balsamorhiza -capitulum close-up

Balsamorhiza -section through capitulum, note receptacle and disk fls

Balsamorhiza -individual disk floret with associated receptacular bract

Chrysanthemum - capitula; note spiral arrangement of disk florets

Taraxacum (dandelion) - habit

Taraxacum (dandelion) - longisection through capitulum; note all ligulate flowers

Tragopogon - fruits with feather-like pappus for wind dispersal