leaf scar


Also found in: Dictionary, Medical, Wikipedia.

leaf scar

[′lēf ‚skär]
(botany)
A mark on a stem, formed by secretion of suberin and a gumlike substance, showing where a leaf has abscised.
References in periodicals archive ?
Bothrodendron is characterised by having small leaf scars directly on the stem surface, although the narrow, almost terminal shoots of Bothrodendron minutifolium have raised leaf cushions similar to those of Lepidodendron (Thomas 1967b).
Isophasic parasitism is the sort of growth behavior in which the longitudinal growth of the endophyte keeps pace with the longitudinal extension of the parasitized host branch and, in every known case, develops its first external shoots in completely predictable locations, especially at leaf scars or even in its leaf axils (Kuijt, 1960).
Such books are helpful because they review the parts of the twig pictorially in their descriptions--lenticels, bud scales, leaf scars, vascular bundles, thorns, and much more.
Trunk up to 8 m high and 30 cm in diameter, bare and conspicuously marked with leaf scars, unarmed, covered in the upper part with leaf sheaths.
stems have leaves or leaf scars and axillary buds or branches) students can interpret more modified forms (e.g.
Stem erect, stout, ringed with leaf scars. Leaves to 80 cm long, deciduous along a straight line in about 70-90 mm from the leaf base, the apex of the remaining rest incurving; sheaths to 50 mm wide, to 25 mm high, abaxially brown-castaneous, adaxially light brown, entire; blades grass-like, 7-17 mm wide, linear, long attenuate, entire, strongly canaled at the base, adaxial glabrous and abaxail pubescent of simple hears.
It is distinguished by biconvex leaf scars on the rhizomes, and deeply cordare, ovate to oblong leaves with a prominent midrib and pinnate venation.
Visitors will also learn why different trees have different-shaped trunks, what bark is for, and how trees gain leaf scars on their branches.
With cerium, most of the above-mentioned symptoms produced with lanthanum were noted, except the stimulation of growth of the trunk and the farther spacing of the leaf scars.
Its twigs "zigzag with very thick pith, at first light brown, becoming ashy gray by winter and marked with occasional lenticels and elevated leaf scars with deep horizontal, crescent shape." Peattie said common persimmon belies its relationship to its relative, the "black tropical cabinet wood ebony, in its heartwood, which is so dark it is almost black." He adds that this sometimes does not develop "until the tree is over a century old.
The best walking sticks have these natural leaf scars, as opposed to a cut or tom leaf socket.
This trunk adpression comprised a root mantle from which protruded well preserved, large (7 cm diameter), configuous leaf scars arranged in two rows on either side of the trunk (Fig.