Trees; a handbook of forest-botany for the woodlands and the laboratory . atifid respectively; if theincision goes deeper the lamina ispinnatisect or palmatisect,or partite respectively, it being understood that in no casehitherto considered does the incision reach the midrib, orbase, and completely cut off the lobe from other other words, the green softer tissues of all the lobesare in continuity one with another by however narrowan isthmus of tissue at the bases of the incisions. A step further, and the lobing or branching of the leafis so complete that each segment— branch of t
Trees; a handbook of forest-botany for the woodlands and the laboratory . atifid respectively; if theincision goes deeper the lamina ispinnatisect or palmatisect,or partite respectively, it being understood that in no casehitherto considered does the incision reach the midrib, orbase, and completely cut off the lobe from other other words, the green softer tissues of all the lobesare in continuity one with another by however narrowan isthmus of tissue at the bases of the incisions. A step further, and the lobing or branching of the leafis so complete that each segment— branch of theleaf—becomes independent of its neighbour, and standsoff from the principal midrib of the leaf, or from thepoint of junction with the petiole at its base, as a separateleaflet, and the whole leaf is now said to be compound,pinnate (Fig. 12), or palmate (Fig. 13), as the casemay be. In such compound leaves the common or principalmidrib, continuous with the petiole, is termed the rachis,and when, as often happens, each leaflet has its own little IV] PINNATE LEAF 41. —e Fig. 12. Pinnate, compound leaf of Dog Rose, llosa eanina. a lateraland <l terminal leaflet; b rachis; c adnate stipules, e midrib ; / second-ary and (j tertiary veins of leaflet; h petiolule (Ett). 42 PALMATE LEAF [CH. stalk attaching it to the latter, such stalk is termed apetiolule.
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Keywords: ., bookcentury1900, bookdecade1900, bookidtreeshandboo, bookyear1904
