. The families of flowering plants. Plants; Phanerogams. 120 FAMILIES OF FLOWEEING PLANTS Everyone who has penetrated a bog filled with sphagnum moss has noticed, the gUstening reddish-hued leaves of the round-leaved sundew (Drosera rotundi/olia), which is our commonest species. Its tiny white flowers open singly, and the curved one-sided raceme elongates just sufficiently to enable the flower of the day to point skyward. mis, with long slender leaves and rose- purple flowers, common in the New Jersey pine b4rrens and southward, is a more handsome plant (see Fig. 104). An examinatio
. The families of flowering plants. Plants; Phanerogams. 120 FAMILIES OF FLOWEEING PLANTS Everyone who has penetrated a bog filled with sphagnum moss has noticed, the gUstening reddish-hued leaves of the round-leaved sundew (Drosera rotundi/olia), which is our commonest species. Its tiny white flowers open singly, and the curved one-sided raceme elongates just sufficiently to enable the flower of the day to point skyward. mis, with long slender leaves and rose- purple flowers, common in the New Jersey pine b4rrens and southward, is a more handsome plant (see Fig. 104). An examination of the leaves of Drosera under a lens will show a mi- nute drop of viscid fluid at the tip of each hair; this serves to entangle small flies, gnats, eiic. In Dionaea, however, the process of specialization has gone even farther, and the leaf, which is divided at the midrib into two nearly semicircular fringed lobes, closes hke a steel trap the moment any foreign object comes in contact with the slen- der sensitive hairs of its inner surface. After the imprisoned object is thor- oughly digested, the leaves again ex- pand; if a bit of wood or^other useless material has been imprisoned, they. Fig. 105. The common river-weed {Podo- stemon Ceratophyllum). After Britten & Brown, 111. Fl. Northeast U. S. will open in a few hours. CHAPTEE XXI. Order JRosales. This large and important order, of which the Eose family (Eosa- ceae) is the type, contains seventeen other families, including the Pa- pihonaceae, Mimosaceae, and Caesalpiniaceae, three groups which col- lectively comprised the old order Leguminosae, and which include the most valuable of our economic plants. In so large a group as the Eosales, it is difficult to find distinguishing characters which will apply equally well to all the members; but in general the rose worts may be known by the insertion of the stamens, which may be either hypogynoiis (on the axil below the pistil) or epigynous (on the pistil itseK); by the se
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