. Peruvian alfalfa : a new long-season variety for the southwest . ir length, giving an impression ofroundness. They range from 1J to 3 times as long as broad. Theaverage width was found by measurement to be mm. and theaverage length 27 mm. In its floral characters the Arabian is much nearer the commonform (fig. 4) than is the Peruvian alfalfa (fig. 5). The flowers areusually smaller; the l<5ng calyx teeth characteristic of the Peruvianform are not present, nor are the teeth as long in comparison withthe calyx tube in the Arabian variety. The low zero point of the Arabian strain may ha
. Peruvian alfalfa : a new long-season variety for the southwest . ir length, giving an impression ofroundness. They range from 1J to 3 times as long as broad. Theaverage width was found by measurement to be mm. and theaverage length 27 mm. In its floral characters the Arabian is much nearer the commonform (fig. 4) than is the Peruvian alfalfa (fig. 5). The flowers areusually smaller; the l<5ng calyx teeth characteristic of the Peruvianform are not present, nor are the teeth as long in comparison withthe calyx tube in the Arabian variety. The low zero point of the Arabian strain may have been broughtabout by long-continued cultivation under a mild winter climate per- a Seeds and Plants Imported During the Period from December, 1003. to De-cember, 1005. Inventory No. 11. Bulletin 07, Bureau of Plant Industry, 1007,p. 121. 118 18 PERUVIAN ALFALFA. mitting growth by plants having a low zero point. Like the Peru-vian, the Arabian alfalfa has a high optimum temperature, acquiredno doubt by cultivation since almost prehistoric times in hot Fig. 4.—Floral parts of common alfalfa : A. calyx : B, standard ; C, wiu^D, keel. (Enlarged seven times.) RECENT BOTANICAL HISTORY OE CULTIVATED ALEALFA. The view that cultivated alfalfa is not one homogeneous species, butis composed of numerous strains, varieties, or even subspecies, requir-ing different cultural treatment, is a somewhat new one. but appears,nevertheless, to be correct.
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