Charles Darwin's Works: The various contrivances by which orchids are fertilised by insects

Acropera adapted adhere adhesive Angræcum antennæ anther anther-case anther-cells appearance base Bonatea capsules Catasetum tridentatum caudicle cells Cephalanthera clinandrum close Cloth column crest cross-fertilisation Crüger Cycnoches Cypripedium distal edges ejected elastic threads Epidendreæ Epipactis examined fertilisation filament fluid formed free nectar Fritz Müller genera genus gnawing grains grandiflora Gymnadenia Gymnadenia conopsea Habenaria insect visiting insects labellum Listera Malaxis Malaxis paludosa manner masses membrane minute Monachanthus Mormodes moths movement of depression Myanthus nature nectary Neotteæ Ophreæ Orchidea Orchids Orchis pyramidalis organs ovarian group ovarium pedicel Platanthera pollen pollen-grains pollen-masses pollinia pollinia removed pollinium position proboscis produced projecting remarkable rostellum rupture saccatum secrete seeds seen self-fertilisation sepals sets hard species specimens spike spiral vessels Spiranthes stamens stigma stigmatic cavity stigmatic chamber stigmatic surface structure summit tellum tion touch upper petals Vandeæ viscid disc viscid matter viscid surface visit the flowers whilst whorl Zeitung