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0rchis Acropera adapted adhere adhesive antennae anther anther-case anther-cells apifera appearance base Bee Ophrys beneath Bonatea bristle capsules Catasetum caudicles cells Cephalanthera clinandrum close column crest cross-fertilisation Cycnoches Cypripedium ejected elastic threads Epidendreae Epipactis examined fertilisation filament flowers fluid formed free nectar genera genus gnawed grains Gymnadenia Habenaria humble-bees insects labellum Listera maculata Malaxis Malaxis paludosa masses membrane Miiller minute Monachanthus Mormodes moths movement of depression nature nectary Neotteae observed Ophreae Orchideae Orchids organs orifice ovarian group ovarium pedicel plant pollen pollen-grains pollen-masses pollen-tubes pollinia attached pollinia removed pollinium position pouch proboscis produced projecting pyramidalis remarkable rostellum rupture secrete seeds seen self-fertilisation sepals sepals and petals sets hard side species specimens spike Spiranthes stamens stigma stigmatic cavity stigmatic chamber stigmatic surface structure summit tellum touch tridentatum upper petals Vandeae viscid disc viscid matter viscid surface visit the flowers whilst whorl
Page 246 - Orchid was created, exactly as we now see it, on a certain " ideal type ; " that the Omnipotent Creator, having fixed on one plan for the whole Order, did not please to depart from this plan ; that He, therefore, made the same organ to perform diverse functions — often of trifling importance compared with their proper function — converted other organs into mere purposeless rudiments, and arranged all as if they had to stand separate, and then made them cohere ? Is it not a more simple and intelligible...
Page 284 - ... it. On the same principle, if a man were to make a machine for some special purpose, but were to use old wheels, springs, and pulleys, only slightly altered, the whole machine, with all its parts, might be said to be specially contrived for that purpose.
Page 20 - Again, referring to the precautions taken to compel the insects to come to the proper spot, in order to have the " pollinia " attached to their bodies, Mr Darwin says : —
Page 1 - The object of the work is to show that the contrivances by which orchids are fertilized are as varied and almost as perfect as any of the most beautiful adaptations in the animal kingdom...
Page 23 - The Labellum is developed into a long nectary, in order to attract Lepidoptera, and we shall presently give reasons for suspecting that the nectar is purposely so lodged that it can be sucked only slowly, in order to give time for the curious chemical quality of the viscid matter setting hard and dry.
Page 245 - ... with its column formed of seven cohering organs, of which three alone perform their proper function, namely, one anther and two generally confluent stigmas, — with the third stigma modified into the rostellum and incapable of being...
Page 236 - Cypripedium), generally forming the clinandrum ; a8, third anther of the same whorl, when present, forming the front of the column.
Page 245 - ... three of the anthers no longer functionally active, but serving either to protect the pollen of the fertile anther, or to strengthen the column, or existing as mere rudiments, or entirely suppressed. What an amount of modification, cohesion, abortion, and change of function do we here see ! Yet hidden in that column, with its surrounding petals and sepals, we know that there are fifteen groups of vessels, arranged three within three, in alternate order, which probably have been preserved to the...