. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 25 b rhizome and may remain active for several years. There is no leafy rosette as the cushion is formed only by the numerous branched shoots with their inter- nodes very distinct, and with the leaves opposite. Halianthus peploides (L.) Fr. This is known best under this name; it is Arenaria peploides L., but the genus has also been called Ammodenia Patrinj Honkenya Ehrh., and Adenarium E,af. The vegetative reproduction is effected by means of long subterranean stolons with membran
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. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 25 b rhizome and may remain active for several years. There is no leafy rosette as the cushion is formed only by the numerous branched shoots with their inter- nodes very distinct, and with the leaves opposite. Halianthus peploides (L.) Fr. This is known best under this name; it is Arenaria peploides L., but the genus has also been called Ammodenia Patrinj Honkenya Ehrh., and Adenarium E, af. The vegetative reproduction is effected by means of long subterranean stolons with membranaceous leaves, scale-like and sheathing, which traverse the ground for some time until they seek the surface where they become trans- formed into aerial shoots with green typical leaves and flowers (Fig. F: 1); many of these stolons ramify freely in the ground; thus the individual represents a mass of floral and vegetative shoots. Very peculiar is the development of dwarfed shoots upon the subterranean noiii of the stolons. They have been described by Warming ^ and, as shown in the figures (Figs. 2-4), they are either simple or ramified. The axis is very short and the leaves of minute size and scale-like; they may persist for several years without developing any further, and, judging from the excellent material collected on the expedition, these shoots may die off without increasing any further in length. Or, as shown at the apex of the long stolon in fig. 2, they may become extended into aerial shoots. As mentioned above, these shoots may develop lateral shoots of the same structure; thus clusters of these may be seen at the root. With respect to the root-system, very thin secondary roots are developed here and there beneath the leaves of the stolons but they are not frequent and no roots were observed to proceed from the upper part of the stojons. No primary root was represented in any of the numerous specimens collected. The seedling stage has been described by Joh. Eriksson