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ASTERACEAE (Compositae) Composite Family

ASTERACEAE (Compositae) Composite Family. Leaves : alternate or opposite, mostly simple, usually toothed or lobed, texture coarse, rough. Inflorescences: heads ( capitula ), each of which is surrounded by an involucre of bracts called phyllaries. involucre. phyllary. Receptacle.

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ASTERACEAE (Compositae) Composite Family

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  1. ASTERACEAE (Compositae)Composite Family

  2. Leaves: alternate or opposite, mostly simple, usually toothed or lobed, texture coarse, rough

  3. Inflorescences: heads (capitula), each of which is surrounded by an involucre of bracts called phyllaries

  4. involucre phyllary

  5. Receptacle

  6. Florets (flowers) of three general types: • Disc florets – these are actinomorphic, often perfect • Ray florets – these are zygomorphic, often pistillate or sterile • Ligulate florets – these are zygomorphic, usually perfect

  7. Corolla of five fused petals Androecium of five stamens, these fused by their anthers, surrounding the style Disc florets Ovary inferior, gynoecium of two fused carpels

  8. Calyx modified as a pappus, of hairs, bristles, etc.

  9. Ray floret Ligulate head and floret

  10. Inflorescence structure: • Heads radiate – both ray and disc • florets • Heads discoid – all disc florets • Heads ligulate – all ligulate florets

  11. An achene is a dry, indehiscent, one-seeded fruit . Fruit an achene

  12. Economic Importance: food (sunflower seeds, artichokes, lettuce), ornamentals (zinnias, dahlias, cosmos, marigolds, chrysanthemums, sunflowers …), pyrethrum, echinacea

  13. R A G W E E D

  14. Making Sense of Diversity: New England Tribes of the Aster Family

  15. CichoreaeChickory Tribe Chickory (non-native) Panicled hawkweed Tribe characters: Heads ligulate; sap milky

  16. CynareaeThistle Tribe Burdock (non-native) Spotted knapweed (non-native) Tribe characters: Heads discoid, involucre spiny

  17. EupatorieaeBoneset Tribe White snakeroot Spotted Joe-pye weed Tribe characters: Heads discoid; leaves opposite or whorled

  18. Inuleae,Everlasting Tribe Pearly everlasting Cudweed Tribe characters: Heads discoid, involucres papery, white

  19. Heliantheae,Sunflower Tribe Cosmos (non-native) Burr marigold Woodland sunflower Tribe characters: Heads radiate, receptacle chaffy; lvs. opposite

  20. Anthemideae,Chamomile Tribe Pineapple weed (non-native) Dog chamomile (non-native) Tansy (non-native) Tribe characters: Leaves finely dissected, aromatic

  21. Senecioneae,Ragwort Tribe Coltsfoot (non-native) New England arnica Tribe characters: Heads radiate, phyllaries uniseriate; leaves alternate

  22. Astereae,Aster tribe Fleabane Blue-stemmed goldenrod New England aster Tribe characters: Heads radiate, phyllaries multiseriate; leaves alternate

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