. A dictionary of the flowering plants and ferns. Botany. 368 LEAF it were a 1., and the common stalk is called the rachis. If the leaflets spring from the sides of the rachis, as in the pea, the 1. is pinnate (F), if all from one point palmate (E). If the leaflets of a pinnate 1., as in many Acacias, are again pinnately cpd., the 1. is bifinnate. A 1. with 3 leaflets (as in clover) is ternate or tri-foliolate, with 3 ternate leaflets bitemate. Pinnate 1. may be equally (part-} pinnate (with an even number of leaflets), unequally (impart-} pinnate (with an odd leaflet at the end), or interrupt
. A dictionary of the flowering plants and ferns. Botany. 368 LEAF it were a 1., and the common stalk is called the rachis. If the leaflets spring from the sides of the rachis, as in the pea, the 1. is pinnate (F), if all from one point palmate (E). If the leaflets of a pinnate 1., as in many Acacias, are again pinnately cpd., the 1. is bifinnate. A 1. with 3 leaflets (as in clover) is ternate or tri-foliolate, with 3 ternate leaflets bitemate. Pinnate 1. may be equally (part-} pinnate (with an even number of leaflets), unequally (impart-} pinnate (with an odd leaflet at the end), or interruptedly pinnate (large and small leaflets alt. as in many Rosaceae). A palmate 1. with 5 or 7 leaflets is often called digitate. The leaflet may have stipule-like organs, or stipels (adjective stipellate). The leaf may be dorsiventral, isobilateral, or centric, or replaced by a phyllode, scale, pitcher, or other organ. The shape of the leaf-blade or leaflet itself, if simple, or the out- line of a cpd. 1., may be needle-shaped or acicular as in Pinus, subulate or awl-shaped, tubular as in onion, linear (long and narrow as in Grasses), lanceolate (about 3 times as long as broad, tapering gradually towards the tip; A in fig.), ovate (about twice as long as broad, and tapering towards the tip; B), cordate (similar, but heart-shaped at the base; C), elliptical (tapering equally to base and tip, and some- what narrow), oval (do. but wider), oblong (sides || for some distance, the ends tapering rapidly; F), reniform (kidney-shaped), orbicular (cir- cular in outline; if the petiole is inserted at the middle of the blade, as in Tropaeolum, this leaf is termed peltate}, hastate (with two pointed jWl 1 ' u -Al • v a / AUM-C ;.ag e FORMS OF LEAVES. A, subsessile, exstip., lanceolate with cuneate base, entire, acute. B, sessile, exstip., ovate, serrate below, entire above, acum. C, petiolate, exstip., cordate, crenate, obtuse. D, ses- sile, exstip., somewhat obovate, pinnatifid sinuate,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
