Leaves less than twice as long as broad, onpetioles 3 cm.
Leaflets thick and firm, the petioles and pedicels pubescent with spreading or ascending hairs; fruit subglobose, the achenes embedded in pits on its surface =Strawberry, Fragaria virginiana.
Stem and petiolessmooth or a little pubescent (flowers greenish-white) --5.
Stipules large and leaf-like, deeply pinnatifid and nearly or quite as long as the petioles --18.
These petioles and filaments also show some tendency to contract spirally.
With the lessened power of spontaneously revolving, compared with that of the previous species, the sensitiveness of the petioles is also diminished.
The petioles which have clasped some object become much more stiff, hard, and polished than those which have failed in this their proper function.
We have seen that the petioles of some other leaf- climbing plants are affected by one-thirteenth of this latter weight.
Full-grown petioles are not in the least sensitive.
Some other petiolessimilarly rubbed twice, that is, once up and once down, became perceptibly curved in about 2 hrs.
The petioles of the perfect leaves of Tropaeolum tricolorum, as well as the tendril-like filaments of the plants whilst young, ultimately move towards the stem or the supporting stick, which they then clasp.
Hence, perhaps, it is that the petioles have acquired a high degree of sensitiveness as a compensation for the little power of movement in the shoots.
The long, thin petioles of the leaves, whilst young, are sensitive, and when lightly rubbed bend to the rubbed side, subsequently becoming straight.
Neither the internodes nor the petioles are irritable when rubbed.
The petioles of the young leaves are very sensitive: a single light rub with a twig caused one to move perceptibly in 5 m.
I took a twig, thinner than the petiole itself, and with it lightly rubbed several petioles four times up and down; these in 1 hr.
The leaves are so small compared with those of most of the other species, that the petioles at first seem ill-adapted for clasping.
The petioles which have clasped any object soon become much thickened and strengthened, as may be seen in the drawing.
Its leaves are nearly similar in structure and in function, excepting that the sub-petioles of the lateral and terminal leaflets are sensitive.
With petioles somewhat widened at base and ciliate; the upper all opposite.
Few; all radical; oval; one to two inches long, on broad petioles six to twelve lines long.
With three leaflets; petioles two to even twelve inches long.
In most of the species, the petioles are winged; that is, they are dilated into little leaves on each side (see d in fig.
In the sweet Lime, the petioles are slightly winged, and there are about thirty stamens; the fruit is small and round, with a slight protuberance at one end like that of the Lemon, and the pulp is sweet.
The petioles are short and thick, and there are large stipules which wither and fall off before the leaves.
The leaves are generally divided into three or five lobes, each of which is cut into several smaller divisions; and the petioles or leaf-stalks are very frequently dilated at the base, and sheathing the stem.
In some kinds of Acacia the true leaves, with the petioles in their natural state, (see fig.
There is only one genus in this order, which can never be mistaken for any other, from the pitcher-shaped petioles of its leaves, and its singular flowers.
They are generally lobed, and their petioles are articulated.
The leaves (c) are impari-pinnate, with the single terminating leaflet larger than the others; and the petioles are articulated.
In the Lemon the petioles are somewhat winged, the flowers have about thirty stamens; the fruit is oblong, with an acid pulp, and a thin rind.
The leaves of the genus Pyrus often have their petioles dilated and somewhat stem-clasping at the base; but they have generally only small stipules.
The petioles of the Clematis could certainly have been drawn in with equal ease by the base and apex; yet three times and in certain cases five times as many were drawn in by the apex as by the base.
The petioles of Robinia pseudo-acacia vary from 4 or 5 to nearly 12 inches in length; they are thick close to the base before the softer parts have rotted off, and taper much towards the upper end.
From these several facts we may conclude that worms draw in some petioles of the ash by the base to serve as food, and others by the tip to plug up the mouths of their burrows in the most efficient manner.
Petioles of a Clematis, somewhat pointed at the apex, and blunt at the base 76 .
Thus, out of 37 petioles inserted by their tips, 5 had been previously drawn in by the base, for this part had been gnawed.
Unfortunately these petioles were not examined until February, by which time the softer parts had completely rotted off, so that it was impossible to ascertain whether worms had gnawed the bases, though this is in itself probable.
The fallen petioles of our native ash-tree were next observed, and the rule with most objects, viz.
We will now turn to the petioles or foot-stalks of compound leaves, after the leaflets have fallen off.
In support of this view, it may be stated that out of the 16 petioles which had been drawn in by their upper ends, the more attenuated terminal portion of 7 had been previously broken off by some accident.
Again, I collected a handful of petioles lying loose on the ground close to some plugged-up burrows, where the surface was thickly strewed with other petioles which apparently had never been touched by worms; and 14 out of 47 (i.
Even the narrow truncated tips of some few petioles had been gnawed; and this was the case in 6 out of 37 which were examined for this purpose.
Some of these objects, such as the petioles just named, feathers, &c.
The leaves are oblong, ovate and pointed, and the petioles are narrowly winged.
The leaves are oval to ovate, the petioles having two glands.
Petioles slender, much expanded at the base, dividing at first in a pinnate manner, and afterwards dichotomously.
The stems seem to have been lax and flexuous, and in some instances they seem to have grown on the petioles of ferns preserved with them in the same beds.
I have in my collection petioles of ferns and fruits of the genus Trigonocarpum partially slickensided in this way, and which if wholly covered by this kind of marking could scarcely have been recognised.
The petiolesare broken off within a few inches of the stem; but other fragments found in the same beds appear to show their continuation, and some remains of their foliage.
In the experiments I made at Caracas, on the air which circulates in plants, I was struck with the fine appearance presented by the petioles and leaves of the Clusia rosea, when cut open under water, and exposed to the rays of the sun.
The vine is peculiar in having very hairypetioles and nearly glabrous shoots.
As regards the sudden fall of the leaf about evening, Pfeffer regarded it as due to increased mechanical moment of the secondary petioles moving forward on the withdrawal of light.
The record of the leaf with amputated sub-petioles exhibits the sudden fall in the evening as that of the intact leaf.
Pfeffer regarded this sudden fall in the evening as due to the increased mechanical moment of the secondary petioles moving forward on the withdrawal of light.
This is another migrant warbler that plucks the dainty white protein corpuscles from the velvety cushions at the bases of the long petioles of the Cecropia tree.
The petioles are rather long, with an enlargement at the base which covers the nascent buds.
Their outline and their veins are generally preserved, often also their petioles and some indication of the thickness and character of the fleshy part of the leaf.
On the petioles and stems were certain rough, spiny structures of the nature of complex hairs.
The petioles of the group show much variety in their structure, and some are extremely complex.
A few of the shapes assumed by the steles of the petioles are seen in fig.
In most of the genera numerous petioles are given off from the main axis, and these are often of a large size compared with it, and may sometimes be thicker than the axis itself.
Every skeleton reposes in a sort of basket made of the petioles of the palm-tree.
The whole of this apparatus was supported by slight frame-work made of the petioles and ribs of palm-leaves.
The leaves are oblong-lance-shaped, pointed at both ends, on long petioles from the bulbous root, but usually withering before the flowers appear.
A single heart-shaped, cordate leaf clasps the stem about midway, while others on long petioles grow from the rootstalk.
The leaves are evergreen, deeply shining green in color, 3-parted and notched, on long petioles from the root.
The smooth light-green leaves are lance-shaped and pointed on short petioles or stems growing oppositely on the plant stem.
The leaves are on long petioles from the rootstalk; they are pale sage-green in color, 3-parted and finely slashed.
Stem arboraceous, leaves sagittate, about one foot long, petioles of two feet.
Later leaves are more nearly like the parent-type, but the petiolesremain short.
Some species of the genus Acacia bear bipinnate leaves, while others have no leaves at all, but bear broadened and flattened petioles instead.
Defn: The fiber by which the petioles of the date palm are bound together, from which various kinds of cordage are made.
Defn: Thin brownish chaffy scales upon the leaves or young shoots of some plants, especially upon the petioles and leaves of ferns.
Defn: An appendage at the base of petiolesor leaves, usually somewhat resembling a small leaf in texture and appearance.
Each carpel-leaf is to be regarded as the common petiole of a pinnate leaf, upon whose lateral petioles the seeds depend.
The accessory leaves or stipules are none other than the remnant of the sheath-formation, out of which all the leaves, and therefore the wings of the leaf-petioles or phyllodia, have issued forth.
We have noticed in some other genera that the petioles of very young plants rise much more at night than do those of older plants.
The leaflets sometimes quickly change their position by as much as nearly 180o; and their sub-petioles can then be seen to become greatly curved.
The petioles and sub-petioles are continually circumnutating during the whole 24 h.
This view seems the more probable, because with Ranunculus ficaria only the petioles of the leaves which forced a passage through the earth were arched; and not those which arose from the summits of the bulbs above the ground.
The leaflets of Cassia Barclayana moved so little at night that they could not be said to sleep, yet the petioles of some young leaves rose as much as 34o.
In one specimen which was closely observed, the petiolesin 7 days after their first protrusion attained a length of 2 ½ inches, and the radicle by this time had also become well developed.
If, however, the point of the confluent petioles meets with some obstacle in the soil, as appears to have occurred with the seedlings described and figured by Asa Gray,* the cotyledons are lifted up above the ground.
The petioles on a young plant, about a foot in height, of Cytisus fragrans rose at night, on one occasion 23o and on another 33o.
On the Chilian plant the petioles of the younger leaves on upright branches, stood horizontally during the day, and at night sank down vertically so as to depend parallel and close to the branch beneath.
Leaves with 2 or rarely 4 pinnae, and slender terete petioles abruptly enlarged and glandular at base; stipules linear, acute, membranaceous, deciduous.
Petioles short, usually slightly wing-margined above the middle, glandless or with occasional minute glands; leaves cuneate at base.
Lower sides of leaves and petioles distinctly downy, the lobes undulate or entire; leaves very thick, drooping at the sides.
Leaf-petioles about 1 inch long; leaves dull above; twigs spicy-aromatic when bruised.
In so far as these characteristics have been observed in the Philippine citrus fruits, long and broad-winged petioles are a third correlative feature distinguishing group No.
When the scars left after the petioles have fallen are well healed the budwood is in condition for budding.
The colo-colo is another of these peculiar Philippine species with more or less winged petioles affiliated to the lemon, etc.
Then when the petioles have dropped and a well-healed scar has formed, the budwood may be cut and the buds inserted and tied as in ordinary shield budding.
De Candolle, flowers and fruits excepted, from a plant growing in Montpellier, being recognized principally by its long broad-winged petioles and free stamens.
Tendrils and leaf petioles are often sensitive to the touch.
While this subject is under consideration, the tendrils of the Pea and Bean and the twining petioles of the Nasturtium will be interesting for comparison.
During the night the petioles are found to be depressed; the subpetioles to be drawn together, the subleaflets folded, the upper or solar surfaces of each pair being brought into contact.
We painted with a thick layer of lamp-black in oil the intumescence of differentpetioles in different ways; the upper surface of one, the under surface of another, the side of a third.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "petioles" in a variety of sentences. We hope that you will now be able to make sentences using this word.
