Elementary botany . is a verycurious plant, closely re-lated to the lemna andsometimes placed in thesame genus. It occursin similar situations, and pjg 3gis very readily grown in Spirodela It reminds one of a little insect asseen in fig. 38. There are several rootlets onthe under side of the frond. Absorption ofwater takes place here in the same way as inlemna. 53. Absorption in wolffia.—Perhaps the most curious of these modifiedwater plants is the little wolffia, which contains the smallest specimens ofthe flowering plants. Two species of this genus are shown in figs. 39-41
Elementary botany . is a verycurious plant, closely re-lated to the lemna andsometimes placed in thesame genus. It occursin similar situations, and pjg 3gis very readily grown in Spirodela It reminds one of a little insect asseen in fig. 38. There are several rootlets onthe under side of the frond. Absorption ofwater takes place here in the same way as inlemna. 53. Absorption in wolffia.—Perhaps the most curious of these modifiedwater plants is the little wolffia, which contains the smallest specimens ofthe flowering plants. Two species of this genus are shown in figs. plant body is reduced to nothing but a rounded or oval green body,which represents the stem. No leaves or roots are present. The plantsmultiply by prolification, the new fronds growing out from a depressionon the under side of one end. Absorption takes place through the undersurface. 54. Absorption by land plants.—Water cultures.—In connec-tion with our inquiry as to how land plants obtain their water, it. 28 PHYSIOLOGY. will be convenient to prepare some water cultures to illustratethis and which can also be used later in our study of nutrition(Chapter IX).
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