an outer covering of dead cells found on the aerial roots of orchids.
the stuck together mass of pollen produced by the orchid flower.
outermost ring of flower parts. Usually, but not always, small and green.
inside the sepal, often large and colored.
inside the petals, a ring of structures that produce the pollen.
the box-like portion of the stamens that actually forms the pollen.
the structure at the center of the flower that produces the egg. The female reproductive part of the flower.
the part of the pistil on which the pollen lands and germinates.
the structure below the stigma through which the pollen tube grows.
the base of the pistil that holds the ovule.
the part of the ovary that contains the egg.
a type of division that results in halving the chromosome number.
a haploid reproductive cell that gives rise directly to an individual offering in plants, fungi, and algae.
Microspore mother cell
the cell that undergoes meiosis and produces the haploid spore or pollen.
the microgametophye of the angiosperm. Usually the pollen grain consists of two cells: the vegetative cell and the generatitive cell. Some pollen has three cells because the generative cell has divided to for two sperm cells.
the haploid male gamete. In angiosperms only two sperm are produced per pollen tube.
the haploid nucleus that governs the growth fo the pollen tube.
the cell in the pollen or pollen tube that undergoes mitosis to form the two sperms.
the act of moving the pollen from the anther to the stigma.
Megaspore mother cell
the cell that undergoes meiosis to form the megaspore
an eight nuclei, seven celled haploid structure that contains the egg. the megagamethophye contains the egg, synergids, the central cell, the antipodals, and the embryo sac.
one sperm fuses with the egg to form the zygote, while the second fuses with the two polar nuclei forming the tripolid endosperm
the product of the fusion of the egg and the sperm
the product of the fusion of the two polar nuclei and the second sperm nucleus. The endosperm nuclei are always 3n.
a group of cells in the young embryo involved in transport of nutrients from the parent plant to the embryo.
the result of fusion of the sperm and egg and the subsequent development of the zygote.
food storage structures formed on the embryo.
Bilaterally Symmetric Flower
flower that can be divided into left right mirror images
Carpellate or Pistillate Flower
a flower that has carpels or pistils and lacks anthers.
all the flowers of an inflorescence form and open at the same time.
a plant species that has staminate flower on one plant and pestillate flower on another plant.
flowers arise directly from a disc shaped mass of tissue: disk flowers are central and lack petals, while ray flowers are at the margin and have a conspicuous petal extending from one side.
a flower that lacks either anthers or pistils.
the first formed flowers mature and open first
a group of flowers on a common stem.
a plant that has both staminate and pistillate flowers
a complex mixture of sugars, amino acids and other components produced by the flower and eaten by insects.
Radially Symmetric Flower
flower parts are equally spaced around the center.