asteraceae Flashcards
discoid flowers
very dense cluster flowers (almost globose), not very showy, entirely disc florets
radiate flowers
made up of central disc florets and radiating ray florets
ligulate flowers
strap-like forets (entirely ray-like), dandilion
chaff
tiny bract-like leaves between disc florets
papus
calyx-like bristles under the floret
achillea millefolium
Yarrow, dense head of tiny white flowers, feathery leaves (very finely dissected
Achillea sibirica
Siberian yarrow, less dense calyx of tiny white flowers, radiate florets less showy, linear, comb like leaves
Arctium minus
Common burdock, spiky balls with purple hates, massive basal leaves
Arnica cordifolia
Heartleaf arnica
- yellow radiate flowers
- cordate shaped opposite leaves
- tiny spikes on stems
- grows in clusters
Artemisia ludoviciana
Prairie sagewort
- aromatic, lancoelate leaves, very wooly
- ball-like discoid green heads in a narrow panicle
Artemisia frigida
Pasture sagewort
- finely dissected, dill-like leaves
- yellow discoid heads in raceme
Aster ciliolatus
Lindley’s aster
- crowded panicle of violet ray flowers
- basal leaves with winged petioles
- sparse bracts subtending heads
Aster conspicuus
Showy aster
- dense overlapping bracts
- terminal corymb, inflorescence crowded at top
- ovate leaves with sandpapery texture, nearly clasping
Liatris punctata
Dotted blazingstar
- linear-lance leaves
- dense spike of discoid heads (lavender-like)
- glandular dotted
petasites palmatus
palmate-leaved coltsfoot
- raceme of white heads with very fine rays
- palmatifid basal leavbes
