. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. PISTIA PITCHER PLANTS 1359 shaded during the middle of the day in summer, or the foliage is likely to become yellow and sickly-looking. In winter the plants are liable to some decay. Botanically, the genus Pistia is unique. The latest monographer of the aroids (Engler, in DC. Mouogr. Phaner. 2,1879) makes Pisti
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. PISTIA PITCHER PLANTS 1359 shaded during the middle of the day in summer, or the foliage is likely to become yellow and sickly-looking. In winter the plants are liable to some decay. Botanically, the genus Pistia is unique. The latest monographer of the aroids (Engler, in DC. Mouogr. Phaner. 2,1879) makes Pistia the sole representative of a subfamily, one of his 10 primary natui'al divisions of the Arum family. He regards the Pistias as all one species, though 9 or more have been described. He recognizes 4 well-marked varieties, based upon the shape of the Ivs., which he calls cuneata, spathulata, obcordafa and lingiiiformis. After the continental fashion Engler takes no one of these as a type to which the others are referred. It is probable that the form with obcordate Ivs. is the one chiefly cult, in American water gardens. Generic characters: fis. unisexual; spadix without ap- pendage, adnate to the back of the spathe; male fls. in whorls, with 2 very short stamens which are much grown together and inserted at the apex of the spadix; female fls. solitary: ovary 1-celled; ovules numerous, orthotropous, in 4—6 series ; fr. baccate, irregularly breaking open, normally with many seeds. Stratidtes, Linn. Water Lettuce. Tropical Duck- weed. Tender perennial aquatic herb described above. The small white fls., though inconspicuous and borne at the bottom of the cup of Ivs., are large enough to show at a glance their relation to the Arum family. 4564. 6:625. -Vy. jj. PiSUM (Greek and Latin name of pea). Legumi- nbsce. About 6 species of mostly climbing herbs of the Mediterranean region and eastward, one of which, P. sativuniy is the common Pea. Calyx-tube oblique at the base, t
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