. Yam culture in Porto Rico . hen the point reaches thetop of the bank. On account of these peculiarities of growth, thisvariety is difficult to dig without injury to the roots. DIOSCOREA CAYENNENSIS. A variety of this species is grown in many parts of the island andis well known in some localities. In Mayaguez it is called Congoamarillo, but in the San Juan market, where it is found in greaterabundance than other kinds, it is known as Yellow Guinea. Itthrives much better in sandy soils than most yams, and is thereforepreferred in some sections. The edible root of this variety closelyresembles
. Yam culture in Porto Rico . hen the point reaches thetop of the bank. On account of these peculiarities of growth, thisvariety is difficult to dig without injury to the roots. DIOSCOREA CAYENNENSIS. A variety of this species is grown in many parts of the island andis well known in some localities. In Mayaguez it is called Congoamarillo, but in the San Juan market, where it is found in greaterabundance than other kinds, it is known as Yellow Guinea. Itthrives much better in sandy soils than most yams, and is thereforepreferred in some sections. The edible root of this variety closelyresembles the White Guinea in shape and size, though theskin is thick and somewhat more corky than the latter. The largeroots attain a length of probably a foot, are rather cylindrical, andaverage a weight of 4 or 5 pounds in seasons when weather condi-tions are favorable. The interior of the starchy root is a rich lightyellow and turns dark brown when exposed to the air. It is smoother Bui. 27, Porto Rico Agr. Expt. Station. Plate Fig. I.—Edible Roots and Air Tubers of Yam (Dioscorea SATIVA VAR.), S. P. I. NO. 31922.
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