- a leaf or leaflet that is lacking a petiole or petiolule (Fig. 15.2 - PDF document

- 9 - - a leaf or leaflet that is lacking a petiole or petiolule (Fig. 15.2a). - the next narrower class of veins after the secondaries, originating Basic Terminology Fig. 3 Fig. 4 Fig. 2Fig. 1Simple Leaf - 15 - petiole - a leaf - a compoundto rachillae, which are borne on the rachis.sessilepetiolulateodd-pinnateeven-pinnate - 18 - 18. LAMINAR SHAPEspecial - leaf is notdescribed by any of theshapes illustrated here(such as a needle orawl).In lobed leaves the bladeshape is determined froman ellipse drawn aroundthe apices of the lobes.The widest part of theellipse is then consideredas in unlobed leaveselliptic - the widest partof the leaf is on an axisin the middle fifth of thelong axis of the leaf.obovate - widest part ofthe leaf is on an axis inthe apical 2/5 of the leaf. Alstonia congensis (Apocynaceae)Fig. 18.2oblong - widest part of theleaf is a zone in the middle1/3 of the long axis wherethe opposite margins areroughly parallel. Ficus citrifolia (Moraceae)Fig. 18.4 Cheiloclinium anomolum (Celastraceae)Fig. 18.1ovate - widest part ofthe leaf is on an axis inthe basal 2/5 of the leaf. Parinari insularium (Chrysobalanaceae)Fig. 18.3 The simplest way to describe the overall shape of the lamina is to locate the axis or, in somecases, the zone of greatest width that lies perpendicular to the axis of greatest length (long axis): Dioscoreophyllum strigosum (Menispermaceae)Fig. 18.5 elliptic - 19 - - base of thelamina of markedly different shape - lamina - lamina approxi- whole laminabase onlyFig. 19.1Fig. 19.2Fig. 19.3 20. LAMINAR L:W RATIO - 22 - = 0). (Salicaceae) 23. BASE SHAPE 0). (Rosaceae) (Apocynaceae) Fig. 23.5concave the margin betweenthe base and 0.25L curvestoward the center of the leaf(lb = 0).Sassafras variifolium (Lauraceae) Fig. 23.6concavo-convex - the marginbetween the base and 0.25L isconcave basally and convexapically (lb = 0).Diploclisia chinensis (Menispermaceae) Fig. 23.7decurrent subtype of either concaveor concavo-convex in which the laminartissue extends basally along the petioleat a gradually decreasing angle (lb = 0).Alstonia plumosa (Apocynaceae) Fig. 23.8complex there are more than twoinflection points in the curve of the marginbetween the base and 0.25L (lb = 0). Adelia triloba (Euphorbiaceae) - 23 - � 0). 23. BASE SHAPE CONTINUED (Menispermaceae) directed exmedially, i.e. at 90 (Asclepiadaceae) - petiolar insertion petiole Brasenia schreiberi (Cabombaceae)Fig. 24.3peltate eccentric - attached near the edge butinside the boundaries of theleaf margin (lbMacaranga bicolor (Euphorbiaceae) � 0). Luniana piperoides (Flacourtiaceaee) - 24 - lobed m islm + la lau% ;&#xof 0; 0).– the length of lmis 75-95% of lm + la la u% ;&#xof 0; 0).retuse – the length of lm is95-99% of lm + la lau% ;&#xof 0; 0). Fitzlania heteropetala (Annonaceae) Fig. 25.8Fig. 25.10 These states apply to the apical 25% of the lamina (0.75L - 1L as in Fig. 7). = = = 0). This = = = Saurauia calyptrata (Actinidiaceae) Ozora obovata (Anacardiaceae) (Myrtaceae) (Annonaceae)Fig. 25.4Fig. 25.6 0% (Oxalidaceae) - 25 - midvein or long axis of the leaf. Teeth can be either dentate, serrate or crenate. (Celastraceae)of the leaf margin. Fig. 26.2Fig. 26.3 (Cornaceae) Fig. 26.6LOBES are marginal indentations that reach 1/4 or more of the distance to the midvein, measuredparallel to the axis of symmetry of the lobe. (Ericaceae) Fig. 26.5unlobed (Rhamnaceae) (Menispermaceae) Fig. 27.327. LOBATIONbilobedFig. 27.2Liriodendrites bradacii (Proteaceae)Fig. 27.4pinnately lobed - 47 - Section 4: Teeth dentations, serrations, crenations). May be angular or rounded. or Fig. 47.1Fig. 1047. # OF ORDERS (OF TEETH) Celtis davidiana (Ulmaceae) (Rosaceae)1 order2 orders3 orders The number of teeth/cm in themiddle 50% of the leaf.48. TEETH/CM 123 Dichroa philippinensis(Hydrangeaceae)Fig. 48.1 4/cm - the interval - the interval Dichroa philippinensis (Hydrangeaceae)Beauaertia mucronata (Celastraceae)Fig. 49.2Fig. 49.1 - 48 - (convex) (straight) APICAL SIDEASIFig. 50.1basally convex andapically concaveapically convex andbasally concave - 49 - angularrounded Fig. 51.1Fig. 51.2 - 50 - papillate, foraminate, mucronate, and setaceous. For situations in which a more specific identifica- spherulate - having a sphericalcallosity fused to the apex. tion of the principal vein Leea macropus (Vitaceae)Fig. 52.6 (Chloranthaceae)lar teeth. This character state - having a clear, Haematostemon coriaceous (Euphorbiaceae)Fig. 52.5simple - tooth apex formed bythe change in direction of theleaf margin without additionalelements. Celtis cerasifera (Ulmaceae)Fig. 52.1spinose - principal vein of toothprojecting beyond the apex. Ilex dipryena (Aquifoliaceae)Fig. 52.3mucronate - with an opaqueor non-deciduous cap ormucro fused to the tooth. - an opaque, deciduous Saurauia calyptrata (Actinidiaceae)Fig. 52.8