Contemporary Circumscription Compared with A Utah Flora 4th ed.
Bio430
Asteraceae•Compositae
No differences
Key Features
The pseudanthium (highly modified head inflorescence that in some ways resembles a single flower) is the outstanding feature of this family. Family specific terminology applies to the parts of this specialized inflorescence.
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Solidago heads dehiscing fruits; recepacle not chaffy; pappus of capillary bristles
Agroseris fruits with pappus and naked or non-chaffy receptacle
Centaurea stoebe. A biennial species with a first year plant in foreground, and flowering second year plant in background
Centaurea stoebe, side view with spinulose phyllaries
Centaurea stoebe fruits with pappus
Viguaria multiflora
Viguaria multiflora, ray and disk florets
Viguiera multiflora- chaffy bracts on receptacle surrounding fruits without pappus
Cypselas with pappus of 2 hook-like tips; receptacular bracts are thin, thread-like
Cultivated Helianthus (sunflower)
This vine climbs over plants in Argentina by tendrils at the tips of its leaves
