A spike of unisexual flowers, each subtended by a bract, and usually deciduous in one piece.
The great majority, however, haveunisexual flowers, bearing stamens or pistils, but not both.
Chenopodiaceae=--Herbs with jointed stems and small unisexual or bisexual flowers.
Oraches are most readily distinguished among the Chenopods by the two bracts which enclose the fruit and enlarge after flowering; and, like the Purslanes, they have unisexual flowers, both male and female being on the same plant.
They belong to the order Naiadaceae, and are characterised by cellular leaves with parallel veins, and inconspicuous unisexual or bisexual flowers.
Flowers arranged in spikelets, unisexual or bisexual, with from one to three stamens.
In order to explain the effects of sexual reproduction, we will first of all consider what happens in monogonic or unisexual reproduction, which actually occurs in parthenogenetic organisms.
The process of transformation of the species from a bisexual into a unisexual form, only composed of females, is obviously incomplete, and is still in process of development.
But if, in fact, all hermaphrodites do occasionally intercross, the difference between them and unisexual species is, as far as function is concerned, very small.
Plants in which some flowers are unisexual and others hermaphrodite.
The unisexual (male and female) flowers, may be on the same or on different plants.
In the phenomena of unisexual generation we see that the larger organisms never reproduce themselves in the unisexual way, while the smaller organisms reproduce themselves with the greatest rapidity by this method.
Between these two extremes unisexual reproduction decreases while the size increases.
Nevertheless, with most kinds it is necessary to take as much care to prevent crosses as with animals or unisexual plants; but with some plants, such as peas, this care is not necessary.
I will merely recall the fact that many plants, though hermaphrodite in structure, are unisexual in function;--such as those called by C.
A Linnæan class of plants, characterized by having both hermaphrodite and unisexualflowers on the same plant.
Defn: Belonging to the Polygamia; bearing both hermaphrodite and unisexual flowers on the same plant.
Defn: The condition or state of a plant which bears both perfect and unisexual flowers.
This stability and this absence of the splitting shown by varietal marks in the offspring of hybrids is one of the best proofs of unisexual unions.
In order to distinguish these two great types of fertilization we will use the term bisexual for the one and unisexual for the other.
It is characterized by numerous narrow unisexual spikelets in a long, loose androgynous panicle, each spikelet having two glumes and six stamens or two more or less connate styles.
At all events, I should like to see it explained how the asexual and the unisexual construction passed into the bisexual by the mere operation of what you call natural causes.
This struggle for existence may have begun--probably it did begin--before the separation of the sexes, when the organism was unisexual or even asexual.
If the spike bears unisexual flowers, as in willow or hazel (fig.
In unisexual flowers it is not uncommon to find vestiges of the undeveloped stamens in the form of filiform bodies or scales.
When in the same plant there are unisexual flowers, both male and female, the plant is said to be monoecious, as in the hazel and castor-oil plant.
The condition or state of a plant which bears both perfect and unisexual flowers.
A Linn\'91an class of plants, characterized by having both hermaphrodite andunisexual flowers on the same plant.
Belonging to the Polygamia; bearing both hermaphrodite and unisexual flowers on the same plant.
Mr. Darwin[196] cites from various sources the following details relating to strawberries which it may be useful to insert in this place, as throwing some light upon the production of unisexual flowers.
Traces of the carpels occur in many male flowers of unisexual plants, e.
Many flowers ordinarily hermaphrodite as to structure, become unisexual by the abortion or suppression of their stamens, or of their carpels, as the case may be.
Complete suppression of the stamens occurs normally in the female flowers of unisexual plants, and, as an accidental occurrence, is not very uncommon.
Complete suppression of the pistil is of more frequent occurrence than that of the stamens, hence more flowers become accidentally unisexual by suppression of the pistil than by deficiency of the stamens.
Structurally hermaphrodite flowers become unisexual by suppression, or are rendered incomplete by the non-development of one or more of their floral whorls.
Flowers in unisexual aments (female flowers of Juglans and Quercus solitary or in spikes); ovary inferior (superior in Leitneriaceae) when a calyx is present.
A unisexual spike of flowers with scaly bracts, usually deciduous in one piece.
Flowers unisexual or perfect, the perianth of the male and female flowers dissimilar; stamens in two series, inserted on the corolla; filaments free; anthers introrse.
Said of a unisexualflower without fertile stamens.
Emasculation and bagging was done at the beginning of anthesis, that is, when the first unisexual male catkins began to shed pollen.
The Effect of Emasculation on Nut Yield Emasculation involves the removal of the unisexual male catkins and the male part of the bisexual catkins.
In walnuts, as well as most other nuts, the male and female functions are performed by unisexual flowers of very different type and appearance.
The unisexual male catkins are the first to start flowering and not until two to three weeks later will the male flowers of the bisexual catkins be in full bloom.
On these trees some flowering branches were bagged which had been emasculated normally, on other branches only the unisexual catkins were removed, while the bisexual catkins were left intact.
Nevertheless, with most kinds it is necessary to take as much care to prevent crosses as with animals or unisexual plants; but with some plants, such as peas, this care does not seem to be necessary.
I will here just recall the fact that many plants, though hermaphrodite in structure, are unisexual in function;--such as those called by C.
The floral stalk is thick and fleshy, and supports numerous unisexual flowers which are clustered round a central axis or spadix that is prolonged above into a club-shaped appendage.
Spikes ofunisexual flowers, such as are common among our forest trees, are called catkins.
Such facts, taken in connection with abundant modern experience of what are called unnatural vices, only prove the universality of unisexual indulgence in all parts of the world and under all conditions of society.
Very often the spikelets are unisexual and the male and female spikelets may be on the same plant as in Coix Lachryma-Jobi and Polytoca barbata, or they may be on different plants as in Spinifex squarrosus.
In the genera Polytoca and Coix the spikelets are unisexual and the male and female spikelets are found in the same inflorescence, the female being below and the male being continuous with it.
Unisexual flowers are Monoecious (or Monoicous, i.
A Linnæan class of plants, characterized by having both hermaphrodite and unisexual flowers on the same plant.
Spikelets of a single perfect or unisexual or rudimentary flower, in jointed spikes, in pairs at each joint, mostly imbedded in the thick rhachis.
Spikelets unisexual or perfect, in loose panicles, with only 2 glumes (in our genera) and palet none.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "unisexual" in a variety of sentences. We hope that you will now be able to make sentences using this word.
