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Malvaceae

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Transcript

  • 1. Malvaceae
    Mallow Family
  • 2. 250 genera
    4230 species
  • 3. Consists of hermaphroditic, rarely monoecious or polygamous trees, shrubs or herbs
    Often with either stellatetrichomes or peltate scales
    Eudicot
  • 4. Leaves
    Simple or palmatelycoumpound
    Sometime lobed to divided
    Palmately or pinnately veined
    Usually spiral and stipulate
    Stipules often caducous
    Caducous- falling early before associated organs are mature
  • 5. Inflorescence
    Solitary
    Paired flower
    Cymelike
    Complex (sometimes)
  • 6. Flower
    Bisexual (rarely Unisexual)
    most Actinomorphic
    Epicalyx typically present
    Hypogynous (situated below the ovary)
  • 7. Perianth
    Biseriate (arranged in two rows)
    Petals alternating with sepals
  • 8. Calyx
    Aposepalous (distinct sepals)
    Basally synsepalous (flowers with fused sepals)
    5 [less often 3 or 4]
    Valvate sepals (meeting without overlapping)
  • 9. Corolla
    Apopetalous (distinct, separate petals)
    Sometmesadnate to the base of an androecium tube
    Rarely absent
    5 [3, 4]
    Clawed, convolute, valvate or imbricate petals
  • 10. Stamen
    5 ∞
    Filaments usually connate
    Either as tube surrounding the ovary or bundles of stamens or a tube bearing bundles
  • 11. Anthers & Pollen
    Anther: longitudinal or poricidal (through pores) dehiscence
    Pollen: spinulose or smooth
  • 12. Gynoecium
    Syncarpous (carpels connate into single unit)
    Superior ovary
    2 ∞ carpels
    2 ∞ [1] locules
  • 13. Style, Placentation & Nectaries
    Style: Unlobed, lobed or branched at apex
    Placentation: axile
    Nectaries: consists of glandular trichomes typically present at the adaxial base of the calyx
  • 14. Fruit & Seeds
    Fruits:
    Loculicidal
    Septicidal
    Indehiscent capsule
    Schizocarp of mericarps
    Rarely berry or samara
    Seeds:
    Exalbuminous (no endosperm) or
    Endorspermous (oily and starchy endosperm)
  • 15. Economic Importance
    Fiber Plants:
    Gossypium spp. (cotton, world’s most important plant)
    Ceibapentandra (kapok)
    Corchorus spp. (jute, source of burlap)
    Food and Flavoring Plants
    Theobroma cacao (cacao, source of chocolate)
    Cola nitida(cola)
    Abelmoschus (okra)
    Duriozibethinus (Durian)
  • 16. Economic Importance
    Wood
    Ochromapyramidale(balsa)
    Pachiraaquatica (money tree)
    Ornamental
    Brachychiton
    Dombeya
    Fremontodendron
    Hibiscus (mallows)
    Tilia (linden tree)
  • 17. PICTURES 
  • 18. PICTURES  (DURIAN)