. Transactions and proceedings of the New Zealand Institute . Fig. 1 Fig. 2. Fig. 1.—Epilobium Billardierianum : Growth-form with creeping 2.—Epilobium Billardierianum : Erect stem with decussate leaves. Chlorenchyma differentiated; onupper surface large rounded cells,elongated like palisade cells; towardslower surface spongy mesophyll withlarge intercellular spaces; chloro-plasts large and round ; crystals(raphides) found commonly in themesophyll. Fibro - vasctilar bundles : Largevein in midrib surrounded by massof colourless parenchyma ; a fewsmaller bundles appear in transversesec
. Transactions and proceedings of the New Zealand Institute . Fig. 1 Fig. 2. Fig. 1.—Epilobium Billardierianum : Growth-form with creeping 2.—Epilobium Billardierianum : Erect stem with decussate leaves. Chlorenchyma differentiated; onupper surface large rounded cells,elongated like palisade cells; towardslower surface spongy mesophyll withlarge intercellular spaces; chloro-plasts large and round ; crystals(raphides) found commonly in themesophyll. Fibro - vasctilar bundles : Largevein in midrib surrounded by massof colourless parenchyma ; a fewsmaller bundles appear in transversesection in the mesophyll. (d.) Conclusion. This plant is evidently a strongmesophyte, from the following cha-racters : Leaf delicate and green,no cuticle, prominent stomata, epi-dermal cell walls thin, structureof chlorenchyma, large fruit(capsule) | 4 va/res ofcfeh/sced capsu/e Fig. 3.—Epilobium BillardierianumFlowering stem. Pegg.—Ecological Study of New Zealand Sand-dune Plants. 167 This plant grew well when pot-grown in the greenhouse, seeming toendure both moisture and dryness. Some shoots grew erect, others bentover the sides of the pot and took root in the sand beneath. 12. Epilobium nerterioides. , „ , ? (u.) Habitat. Very common in moist sand-hollows at both ends of the beach. Onthe south end it grew commonly with Selliera radicans, forming sparsecarpets on the surface of the sand. (b.) Growth-form. A small creeping herb, with stem covered, and only the leaves visibleabove the sand in its natural habitat, forming a double row or small patchof leaves dotted more or less closely over the sand. Stem long, creeping, often under sand, herbaceous, slender, giving riseat intervals of about 5—5 in. to a pair of leaves and a rootlet or two. Lewes opposite, with short petioles, §—\ in. long, the blade
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