Relative Transpiration of Old and New Leaves of the Myrtus Type

摘要: WHILE making some studies of the transpiration coriaceous leaved evergreens Neapolitan region, such as Olea, Pistacia, and Quercus h1ex, writer became interested in question relative activity their old new leaves. Some results measurements made upon them are here set down, together with a few words discussion regard to meaning facts observed. It is commonly said that trees shrubs Mediterranean region largely evergreen, but little examination into characteristics shows word "evergreen" should be used describe only when its carefully defined. When local floras, like GUSSONE'S excellent catalogue plants Ischia, summer deciduous Spartium junceum, Cytisus scoparius, Calycotome villosa evergreens, it would seem any woody plant leaves which remain green during considerable part winter considered an evergreen. As matter fact, angiospermous coastwise about Naples classifiable, regards mode shedding leaves, divisions shown table' on opposite page. division I may described facultative species; is, they retain almost or quite year around. The Medicago Euphorbia above named do this water supply abundant. members II more less covered at all seasons. Those belong subdivision i show difference density foliage dependent season. Many, however, 2 lose nearly soon after have reached full size (area). Rhamnnus Alater-