New Zealand plants and their story . ected on Mount Peel by Mr. H. H. Allan. In a case such as theabove, who can doubt the youth of these varieties, or that evolutionis still hard at work with the Veronica salicifolia group ? A case where a somewhat greater degree of stability {, of age)comes in is with regard to Leucopogon fasciculatus. No one hassuggested, so far, that this species is an aggregate, or variable, 200 NEW ZEALAND PLANTS. to use the common but more incorrect term. Yet in the AucklandBotanical Districts the shrub passes through a distinct juvenile formwith leaves much broader
New Zealand plants and their story . ected on Mount Peel by Mr. H. H. Allan. In a case such as theabove, who can doubt the youth of these varieties, or that evolutionis still hard at work with the Veronica salicifolia group ? A case where a somewhat greater degree of stability {, of age)comes in is with regard to Leucopogon fasciculatus. No one hassuggested, so far, that this species is an aggregate, or variable, 200 NEW ZEALAND PLANTS. to use the common but more incorrect term. Yet in the AucklandBotanical Districts the shrub passes through a distinct juvenile formwith leaves much broader than those of the adult (see text-figurebelow)—a form, too, which persists for a number of years. Farthersouth both juvenile and adult have the narrow leaves (compare thejuvenile forms in the two text-figures), but exactly where the line ofseparation comes between the two varieties has not been more example of the distribution of true-breeding races ofan aggregate species and the chapter must end, though there are. Juvenile form of Leucopogon fasciculatus collected in theNorth Auckland Botanical District. (Life size.) [Esmond Atkinson del. many matters connected with distribution in New Zealand thathave been left unsaid. This is the case of the aggregate Celmisiaglandulosa, frequently a plant of subalpine bogs or wet speaking, throughout the area of its distribution it isrepresented by a well-marked variety (the type ) ; but on MountBgmont this variety is absent, and in its stead a plant with muchbroader leaves is alone to be found. Again, in the Clinton Valley(Fiord Botanical District), it is neither of the above varieties which NARROW-LEAVED LEUCOPOGON FASCICULATUS. 201 occurs, but a much more robust plant with long flower-stalks. Inthe case of the aggregate C. glandulosa the differences appear due toisolation having permitted these two forms of limited distributionto arise.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
