Volunteer Park Conservatory cycads, and orchids, visitors will find banana ("Musa"), Bird of Paradise ("Strelitzia"), "Anthurium" and ginger (Zingiberaceae) in this house. The conservatory’s orchid collection, which began as a gift from Mrs. Anna H. Clise in 1921, is also found in the Palm House. Orchids are a large and diverse flowering plant family composed of more than 20,000 species. The conservatory’s collection includes representatives of the largest genera – "Bulbophyllum", "Epidendrum", and "Dendrobium" – as well as commonly cultivated genera such as "Cattleya" and "Phalaenopsis". Transporting endangered orchids is prohibited by the Convention of International Trade of Endangered Species (CITES) and many
Flowering plant nectar, which may be secreted in some part of the flower. The characteristics that attract pollinators account for the popularity of flowers and flowering plants among humans. While the majority of flowers are perfect or hermaphrodite (having both pollen and ovule producing parts in the same flower structure), flowering plants have developed numerous morphological and physiological mechanisms to reduce or prevent self-fertilization. Heteromorphic flowers have short carpels and long stamens, or vice versa, so animal pollinators cannot easily transfer pollen to the pistil (receptive part of the carpel). Homomorphic flowers may employ a biochemical (physiological) mechanism called self-incompatibility to discriminate