And, here again, there is no vestige of intermediate species, linking dicotyledonous plants with other types.
A large family of dicotyledonous plants, having their flowers arranged in dense heads of many small florets and their anthers united in a tube.
Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body.
Bearing the stamens directly on the receptacle; -- said of a subclass of polypetalous dicotyledonous plants in the system of De Candolle.
The soft spongy substance in the center of the stems of many plants and trees, especially those of the dicotyledonous or exogenous classes.
Physically speaking, this was the age of continents broken by large inland seas; while in the organic world it was the age of Mammalia among animals, and of extensive Dicotyledonous forests among plants.
In others, heaps of broken shells are mingled with pebbles of rocks foreign to the neighbourhood, and with fragments of abraded madrepores, dicotyledonous wood, and crabs' claws.
In Bohemia, the rich veins of silver of Joachimsthal cut through basalt containing olivine, which overlies tertiary lignite, in which are leaves of dicotyledonous trees.
The dicotyledonous stems found in lignite are occasionally distinguished by colossal size and great age.
I can fancy how an Acotyledonous plant gets a stem but how a Dicotyledonous plant loses it, and becomes as some of them do, mere discs spread over rocks is another thing.
The existence, therefore, of so extensive a deposit of Dicotyledonous plants, at this early period of the earth's vegetation, appears to demand the attention of the naturalist.
In 1680 he noticed that yeast consists of minute globular particles, and he described the different structure of the stem in monocotyledonous and dicotyledonous plants.
In dicotyledonous plants the first leaves produced (the cotyledons) are opposite.
The sheath-like cotyledons of the Gramineae circumnutate, that is, move to all sides, as plainly as do the hypocotyls or epicotyls of any dicotyledonous plants.
After the radicle has penetrated the ground and fixed the seed, the hypocotyls of all the dicotyledonous seedlings observed by us, which lift their cotyledons above the surface, break through the ground in the form of an arch.
Lastly, the wide distribution in the dicotyledonousseries of plants with cotyledons which sleep.
The numbers of the Families, and with the Leguminosae the numbers of the Tribes, have been added to show how widely the plants in question are distributed throughout the [page 300] dicotyledonous series.
With all the dicotyledonous seedlings described in the last chapter, the cotyledons were in constant movement, chiefly in a vertical plane, and commonly once up and once down in the course of the 24 hours.
With dicotyledonous seeds, after the protrusion of the radicle, the hypocotyl breaks through the seed-coats; but if the cotyledons are hypogean, it is the epicotyl which breaks forth.
The narrow green leaf, which protrudes from the seed of the common onion as a cotyledon,* breaks through the ground in the form of an arch, in the same manner as the hypocotyl or epicotyl of a dicotyledonous plant.
A Bean-stalk and the stem of any common shrub or tree represent the second; and to it belong all plants with dicotyledonous or polycotyledonous embryo.
And the polycotyledonous is only a variation of the dicotyledonous type,--a difference in the number of leaves in the whorl; for a pair is a whorl reduced to two members.
On submitting them in thin slices to the microscope, they were found to exhibit the peculiar dicotyledonous structure as strongly as the oak or chestnut.
On the other hand, the dicotyledonous herbs and trees, previously so inconspicuous in creation, are largely developed.
In the great Secondary division, the true dicotyledonous plants first appear; but, so far as is yet known, no dicotyledonous wood.
The dicotyledons are of more complex structure, and somewhat more perfect organization, than the monocotyledons: and some dicotyledonous families, such as the Compositae, are rather more complex in their organization than the rest.
A farmer does not divide plants, like a botanist, into dicotyledonous and monocotyledonous, but into useful plants and weeds.
The volume referred to contains a paper on the Cretaceous Flora of the Arctic Zone (Spitzbergen and Greenland), in which several dicotyledonous plants are described.
Mature dicotyledonous embryo of the Almond, with one of the cotyledons removed.
In the Lower Cretaceous formation, near Aix-la-Chapelle, the leaves of a great many dicotyledonous trees have lately been discovered by Dr.
All areDicotyledonous (a few have many cotyledons), and all Exogenous, except Cycas, the growth of which is anomalous.
They are Gymnogens as to ovules, and neither Exogens nor Endogens in the wood of their short, simple, or branched trunks, and they have dicotyledonous seeds.
But then we find that labiates and their allies among the dicotyledonous plants, and orchids among the monocotyledonous ones are especially subjected to this alteration.
Seed-leaves show many deviations from the ordinary shape, especially in dicotyledonous plants.
Defn: Bearing the stamens directly on the receptacle; -- said of a subclass of polypetalous dicotyledonous plants in the system of De Candolle.
Defn: The soft spongy substance in the center of the stems of many plants and trees, especially those of the dicotyledonous or exogenous classes.
Defn: Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body.
In the Upper Cretaceous rocks this flora is replaced by one which consists to a large extent of dicotyledonous angiosperms.
But among the dicotyledonous vegetables there is none that merit the attention of naturalists as the creeping ligneous plants known as so much lianes.
Under the dicotyledonous groups, there are no plants with simplicity of floral elements.
Neocomian beds contain a true dicotyledonous leaf with Dammara and Araucaria.
Their age is probably about that of the Fox-Hill group or Senonian, and the Upper Cretaceous of Vancouver Island, and they afford a large proportion of dicotyledonous leaves.
But the great feature of the time was its dicotyledonous forests, and I have only to enumerate the genera supposed to be represented in order to show the richness of the time in plants of this type.
Here dicotyledonous leaves abound, amounting to ninety species, or more than half the whole number of species found.
It may be well to begin this chapter with a sketch of the general physical and geological conditions of the period which was characterised by the advent and culmination of the dicotyledonous trees.
In all, no less than forty-eight genera are present belonging to at least twenty-five families, running through the whole range of the dicotyledonous exogens.
The dicotyledonous Angiosperms, which correspond to them in the vegetable kingdom, occur far earlier--in the beginning of the Upper Cretaceous or close of the Lower Cretaceous.
The dicotyledonous plants above referred to are trees and shrubs.
Before the close of the Lower Cretaceous period the dicotyledonous flora seems to have been introduced, under geographical conditions which permitted a warm temperate climate to extend as far north as Greenland.
In relation to this, Saporta, one of the most enthusiastic of evolutionists, is struck by this phenomenon of the sudden appearance of so many forms, and some of them the most highly differentiated of dicotyledonous plants.
In the Cenomanian or Middle Cretaceous age we find the northern hemisphere tenanted with dicotyledonous trees closely allied to those of modern times, though still indicating a climate much warmer than that which at present prevails.
The species of Sequoia, Gingko, Taxus, and Glyptostrobus are also identical or closely allied, and so are many of the dicotyledonous leaves.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "dicotyledonous" in a variety of sentences. We hope that you will now be able to make sentences using this word.
