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SC: Asteridae Order: Asterales Family: Asteraceae “Composites, Sunflowers”. 1. 22,000 species in 900 genera

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sc asteridae order asterales family asteraceae composites sunflowers
SC: Asteridae Order: Asterales Family: Asteraceae “Composites, Sunflowers”
  • 1. 22,000 species in 900 genera
  • 2. Flowers (florets) are typically arranged in HEADS. Expanded Receptacle; florets epigynous; entire Head surrounded by an involucre of bracts – phyllaries; head is support by a flower stalk called the peduncle; inferior
  • Pappus – bristles or scales (modified calyx)
  • Corolla – coalescence of petals
  • Stamen – 5 coalescent around style
  • Pistil – one; 2 stigma lobes
sc asteridae order asterales family asteraceae composites sunflowers2
SC: Asteridae Order: Asterales Family: Asteraceae “Composites, Sunflowers”
  • Pappus – bristles or scales (modified calyx)
  • Corolla – coalescence of petals
  • Stamen – 5 coalescent around style
  • Pistil – one; 2 stigma lobes
  • 3. Ray Flowers – 3 of the coalesced petals elongate into a ligule.
  • 4. Great variablity! Sterile, pistilate, staminate, perfect….
tribes
Tribes
  • Chicory Tribe –
    • 1. Ray flowers only
    • 2. Milky sap
    • Lactuca “wild lettuce”, Taraxicum “dandelion”, Chicorium “chicory”
tribes4
Tribes
  • Ragweed Tribe -
    • Monoecious; staminate and pistillate flowers on same plant
    • Ambrosia trifida “giant ragweed”, Ambrosia artemisifolia “small ragweed”
tribes5
Tribes
  • Aster Tribe -
    • Style branches flattened in middle….
    • Solidago “goldenrods”, Aster “asters”
tribes6
Tribes
  • Sunflower Tribe -
    • 1. Both disc and ray flowers
    • 2. Usually a crown of hairs at base of stigma
    • 3. Pappus mostly bristle-like
    • Helianthus “sunflowers”, Chrysanthemum “ox-eyed daisy”
tribes7
Tribes
  • Snakeroot Tribe -
    • 1. disc flowers only
    • 2. leaves mostly opposite
    • Eupatorium rugosum “white snakeroot”, Liatris “blazing star”, Eupatorium purpureum “Joe Pye weed”, Eupatorium altissimum “tall thoroughwort”
tribes8
Tribes
  • Ironweed Tribe –
    • 1. Disc flowers only
    • 2. Anthers sagittate
    • 3. Stigma lobes long and pointed
    • Veronia “ironweed”
tribes9
Tribes
  • Thistle Tribe –
    • Receptacle with a spiny involucre of bracts
    • Cirsium vulgare “bull thistle”, Carduus nutans “musk thistle”