. Yam culture in Porto Rico . Fig. I.—Result of Experiment in Spacing Plantings of Potato on Right, 4 by 4 Feet; on Left, 2 by 2 Fig. 2.—A Hill of Tongo Yams (Dioscorea aculeata). S. P. I. No. 31923. YAM CULTURE IX PORTO RICO. 17 The vines of this variety are long, large, vigorous, and angular andhave four sides. A membrane, or wing, running the length of thevine is found at each corner. The leaf petiole is from 5 to T incheslong and has five wings which are formed at its angles, the same asthose on the vine. These extend into the five largest veins on thelower surface of the
. Yam culture in Porto Rico . Fig. I.—Result of Experiment in Spacing Plantings of Potato on Right, 4 by 4 Feet; on Left, 2 by 2 Fig. 2.—A Hill of Tongo Yams (Dioscorea aculeata). S. P. I. No. 31923. YAM CULTURE IX PORTO RICO. 17 The vines of this variety are long, large, vigorous, and angular andhave four sides. A membrane, or wing, running the length of thevine is found at each corner. The leaf petiole is from 5 to T incheslong and has five wings which are formed at its angles, the same asthose on the vine. These extend into the five largest veins on thelower surface of the leaf. Enlarged purple sections J to f inchlong grow near each end of the petiole. The blade of the leaf is6 by 4 or 5 inches, and if is dark green. A few small air tubers 2 by1J inches develop on the vines of this variety. The edible root isalmost spherical or made up of two or three large round lobes. How-ever, it never forms long, deep-growing roots. Usually a slightdepression occurs at the union with the rootstock. The surface ofthe root is rough, corky, and dark gray. The interior is a richpurple and has some areas where the coloring
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