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Sentences for "cleistogamous "
" No plant dares depend upon its cleistogamous or blind flowers alone for offspring; and in the sixty or more genera containing these curious growths, that usually look like buds arrested in development, every plant that bears them bears also showy flowers dependent upon cross-pollination by insect aid.
This species produces no cleistogamous or blind flowers.
This species produces an abundance of late cleistogamous flowers on erect stems.
In addition to its showy blossoms, which so successfully invite insects to transfer their pollen, thereby counteracting the bad effects of close inbreeding, the plant bears inconspicuous cleistogamous or blind ones also.
It is estimated that the average blind flower of the wood-sorrel does its work with four hundred pollen grains, while the prodigal peony scatters with the help of wind and insect visitors over three and a half millions! Yet no plant, however economically inclined, can afford to deteriorate its species through self-fertilization; therefore, to overcome the evils of in-breeding, the wood-sorrel, like other plants that bear cleistogamous flowers, takes special pains to produce showy blossoms to attract insects, on which they absolutely depend to transfer their pollen from flower to flower.
Unlike the common milkwort and many of its kin that grow in clover-like heads, each one of the gay wings has beauty enough to stand alone, Its oddity of structure, its lovely color and enticing fringe, lead one to suspect it of extraordinary desire to woo some insect that will carry its pollen from blossom to blossom and so enable the plant to produce cross-fertilized seed to counteract the evil tendencies resulting from the more prolific self-fertilized cleistogamous flowers buried in the ground below.
It has been said that the fringed polygala keeps ""one flower for beauty and one for use""; ""one playful flower for the world, another for serious use and posterity""; but surely the showy flowers, the ""giddy sisters,"" borne by all cleistogamous species to save them from degenerating through close inbreeding, are no idle, irresponsible beauties.
But, as if the plant had not sufficient confidence in its visitors to rely exclusively on them for help in continuing the lovely species, it bears also cleistogamous blossoms that never open - economical products without petals, which ripen abundant self-fertilized seed (see white wood sorrel).
In England, where this jewel-weed is rapidly becoming naturalized, Darwin recorded there are twenty plants producing cleistogamous flowers to one having showy blossoms which, even when produced, seldom set seed.
Abundant cleistogamous flowers (see blue violets and white wood sorrel) are borne on the runners late in the season.
Every plant which bears cleistogamous or blind flowers - violets, wood-sorrel, jewelweed, among others - must also display some showy ones.
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