A pulvinus is a flexible segment in the leaf stalks ( petiole ) of some plant species and functions as a'joint '.
12.
There may be swollen regions at either end of the petiole known as pulvina ( singular = pulvinus ) that are composed of a flexible tissue that allows leaf movement.
13.
Determining that a tree is a member of a spruce species is not difficult; evergreen needles that are more or less quadangled, and especially the pulvinus, give it away.
14.
Leaves are present, except for a few species of " Phyllanthus " that have flattened, leaflike stems called petiole is nearly always present, often with a pulvinus at its base.
15.
He conducted extensive research on the mechanics of sap ascent, the construction of a leaf's pulvinus, the positioning of a plants'leaves, and the inner-workings between stomata and its guard cells.
16.
A seat for these was called a " pulvinar ", from " pulvinus " ( " cushion " ), and many temples held these; at the banquets statues of the deity were placed on them.
17.
In most plants, old senesced leaves will simply fall by themselves when ready will simply pop off at the pulvinus ( the little bulb like you find at the end of elm and oak petioles ) if you touch them lightly or blow on them.
18.
Phyllodes straight or curved, terete or subterete, 5 16 cm long, 0.5 1.3 mm wide, obscurely multistriate, usually finely hairy along margins especially towards curved, acute apex; glands absent or 1 inconspicuous gland at base; pulvinus 2 3 mm long.
19.
The succulent petioles, again in Queensland, can be up to four in ( 10 cm ) thick, and in the variety A e . microura of the Solomon Islands the petiole can be up to 8'9 " ( 2.7 meters ) in length, joined to the trunk or caudex by a pulvinus which can be up to 8 in ( 20 cm ) thick that serves to raise and lower the frond in response to weather conditions.
20.
Alternate, compound, bipinnate, petiolate, petiole long with gland below and lower pair of pinnae and a few between the upper pinna; pinna 8-30 pairs, opposite; leaflets 40-80 pairs close set, sessile, linear-oblong, fulcate ( sickle or scythe shaped ), truncate at the base [ 2 ] ( as it cut off by a straight tranverse line; blunt ); stipulate, leaf base frequently swollen forming pulvinus.
