In the latter plants there is also a membranous outgrowth, the ligule, at right angles to the median plane of the leaf from the point where the sheath passes into the lamina, there being no petiole (fig.
In leaves in which no sheath is produced we not infrequently find small foliar organs, stipules, at the base of the petiole (fig.
Leaf of Orange (Citrus Aurantium), showing a winged leafypetiole p, which is articulated to the lamina l.
In Lathyrus Aphaca and some other plants the true pinnate leaves are abortive, the petiole forms a tendril, and the stipules alone are developed, performing the office of leaves.
The petiolevaries in length, being usually shorter than the lamina, but sometimes much longer.
The petiole is inserted a little above the base, and hence the leaf is called peltate or shield-like.
Heliamphora the pitcher is composed of the petiole of the leaf.
In general, the petiole is more or less rounded in its form, the upper surface being flattened or grooved.
In some Australian acacias, and in some species of Oxalis and Bupleurum, the petiole is flattened in a vertical direction, the vascular bundles separating immediately after quitting the stem and running nearly parallel from base to apex.
Base has a heart-shaped notch; petiole long and slender, usually red.
At Argao, Cebu, banana petiole mats are woven as a by-product of the saba cloth industry.
Stem-leaves ovate or ovate-lanceolate, contracted at the base into a winged petiole (6-15 dm.
Base of petiolenot covering the bud, and twigs not marked with rings --115.
Leaves pinnately veined, or sometimes with smaller lateral veins arising from the end of the petiole --100.
Leaves narrowed at the base into a winged petiole --195.
Stipules small, inconspicuous, entire or toothed, and much shorter than the petiole --19.
Leaves with glands on thepetiole or at the base of the leaf-blade --132.
Leaves narrowed at base into a petiole =Speedwell, Veronica officinalis.
Leaves petioled, or narrowed at the base into a petiole (5-30 dm.
Defn: Three times ternate; -- applied to a leaf whosepetiole separates into three branches, each of which divides into three parts which each bear three leafiets.
Defn: Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom.
Defn: An East Indian palm (Caryota urens) having leaves pinnate with wedge-shaped divisions, the petiole very stout.
Defn: A petiole dilated into the form of a blade, and usually with vertical edges, as in the Australian acacias.
Dots on the surface of a leaf-scar, which are scars left by the fibro-vascular bundles which run through the petiole into the blade of the leaf.
These are the scars left by the fibro-vascular bundles which run through the petiole into the blade of the leaf, and are designated as bundle-scars.
The larva in constructing its cocoon, first spins a strong band around a twig, and binds the petiole of the leaf to the stem; this band extends down the petiole to the cocoon, and thus anchors it.
As a rule, they are found suspended from a branch by a silken cord, the length of which depends upon the length of the petiole of the leaf in which the cocoon was spun.
Thus if the leaf has only a short petiole, this cord is also short, but if the petiole is two or three inches long, the suspensory cord is correspondingly long.
The leaves of all our grasses consist of the blade, which passes directly into the sheath, without anypetiole or leaf-stalk (Fig.
The projections at the upper end of the petiole (from four to six in number) are considerably longer relatively to the blade, and much more attenuated than those of the European form.
Some, however, are seated on the margins of the membrane; and the short ventral surface of the bladder, between the petiole and valve, is thickly covered with glands.
The bilobed leaf appears also to be rather larger and somewhat broader, with the pedicel by which it is attached to the upper end of the petiole a little longer.
Does the leaf have a stem or petiole or is it attached directly to the branch without any stem?
Some aphids on the petiole and leaves of the Virginia Creeper on our piazza once afforded me a convenient field for daily observation.
Leaves all under water and mostly petioled, their capillary divisions and subdivisions rather long and soft, usually collapsing more or less when withdrawn from the water; petiole rather narrowly dilated.
Leaves broader and more or less heart-shaped; petiole commonly hairy.
Upper part of petiole and scape and especially the orbicular-ovate obtuse bracts and sepals pubescent or woolly; beak of fruit horizontal.
A somewhat dilated petiole having the form of and serving as a leaf-blade.
Large trees, with the bark deciduous in broad thin brittle plates; dilated base of the petiole enclosing the bud of the next season.
An appendage at the base of a petioleor on each side of its insertion.
Tall woody reeds, the flat leaves with a short petiole jointed upon the sheath.
Thus, in Passiflora and Viburnum Opulus, the so-called glands on the sides of the petiole appear to represent leaflets, and are not unfrequently developed as such.
In the one case the new leaflet springs from the apex of the petiole and partially fills the space consequent on the obliquity of the base of the leaf.
When the blade of the leaf is suppressed it often happens that the stalk of the leaf is flattened, as it were, by compensation, and the petiole has then much the appearance of a flat ribbon (phyllode).
As glycerine, by absorption of water, causes partial desiccation, I tried its effect on conduction of excitation in the petiole of Mimosa.
Maximum tension in the morning will make the petiole approach the tip of the stem, i.
The transmission in the petiole of Mimosa is a phenomenon of conduction.
The end of the petiole beyond the point of application of the testing stimulus was now cut off, and record of velocity of transmission taken once more.
Now on exciting the petioleby the previous stimulus, the conducting power was found to be greatly enhanced.
When the current is reversed it flows in the petiole from left to right and the transmitted impulse travels with the current or in a ‘down-hill’ direction.
In the leaf of Arenga saccharifera, I found that the petiole was the organ of movement.
The petiole carrying the leaflet is mounted water-tight in the short arm of an U-tube filled with water; for producing internal hydrostatic pressure in the plant the height of water in the longer arm is suitably raised.
For investigations on velocity of transmission of excitation, stimulus is applied on the petiole at some distance from the pulvinus, by means of suitable electrodes.
After attaching the petiole to the recording lever, indirect stimulus is applied, generally speaking, at a distance of 15 mm.
The petiole continued to give records of its diurnal movement in every way similar to the record of the intact leaf.
It is, however, possible using the precautions described below to use the detached petiole carrying the pulsating leaflets.
N, before, and the other after the application of glycerine on a length of petiole through which excitation was being transmitted.
The plant was now held inverted, the upper side of the petiole now facing the earth.
This can be demonstrated by taking a petioleof Biophytum sensitivum or of Averrhoa carambola.
Lobed or divided, with the sinuses pointing to or reaching the apex of the petiole or insertion.
A petiole dilated into the form of a blade, and usually with vertical edges, as in the Australian acacias.
The distal ends of these girdles give off several branches, which traverse the petiole and rachis as numerous collateral bundles.
In many Australian acacias the leaf surface in the adult plant is much reduced, the petiole being at the same time flattened and enlarged (fig.
Together with the petiole usually come off adventitious roots, as is seen in fig.
A petiole about to detach itself p and the strand going out to an adventitious root r are also seen.
On the sheath were glandular hairs like those found on the petiole and leaves, which were, indeed, the first clues that led to the discovery of the connection between the seed and the plant Lyginodendron.
They are usually on the petiole at the base of the leaf but are sometimes on the leaf itself.
The petiole or footstalk of the leaf sheaths the stem, as shown at h, where the leaf is represented on a reduced scale to suit the flower.
The leaves of this plant are very curious; the midrib is lengthened and drawn out into a tendril, as shown at f, and the petiole (g) is decurrent.
The plants belonging to this order have alternate leaves, which are generally compound, and frequently have the common petiole tumid; they have also two stipules at the base of the petiole, and frequently two others to each leaflet.
The leaves are smooth and shining; and they are articulated; that is, they can be separated from the petioleor footstalk without lacerating them.
The petioleis so much dilated as to look like a leaf, but the real leaf consists of only the two roundish lobes edged with teeth that form the Fly-trap.
The main petiole is dilated at the point where it joins the stem; and the leaves are placed alternately.
Abdomen compressed, segments 2, 4 and 5 subequal, longest, the abdomen glabrous, its petiole about twice longer than wide.
The leaf, borne on a petiole two to six inches long, is divided into from five to nine shallow, angular, or rounded saw-edged lobes.
The leaves, which are lance-shaped or oblong, gradually increase in size and length of petiole until the lowest often measure nine inches long.
A modification of the petiole forms a deep hollow pitcher having for its spout a modification of the blade of the leaf.
But if the opposite surfaces, those namely, which change colour and are shortened when the petiole is depressed and the subleaflets folded, are touched with the point of the needle these actions are instantaneously produced.
The transition is abrupt from the surface against which the needle may be made to prick, without exciting action, to one which, when the needle reaches it, causes the petiole to be instantaneously thrown down.
We tried what result would ensue upon slitting the intumescence of the petiole horizontally.
But the under part of the intumescence of the petiole is the portion which is shortened during its depression, and which is overcome on this occasion by the superior force of the upper portion.
The needle may be applied to every point upon the upper or solar half of the intumescence of the petiole (a, Fig.
In a little time afterwards, the petiole is bent downwards at its intumescence; and in a few seconds more the remaining leaflets upon the same petiole fold their subleaflets in pairs, from the base towards the point of the leaflet.
He discovered that the cortex of the intumescence is the seat of its irritability: for upon wholly removing the bark, so as to expose the ligneous substance, the petiole was found to have been rendered motionless.
The petiole or stalk of each leaf, at the extremity which is attached to the branch or stem of the peant, swells into an intumescence varying from three to five in length.
In other climbers the blade of the leaf is not reduced in size, even though the leaf serves the purpose of a tendril, the function of clinging being assigned exclusively to the petiole or leaf-stalk.
This may be observed in the Wild Clematis and the Bryony, in both of which the petiole forms a ring round any branch or stem with which it comes in contact.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "petiole" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: axis; bole; cane; pedicel; reed; spear; spire; stalk; stem; stock; straw; trunk
