. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 20 BULLETIN 428, U. S. DEPAETMENT OF AGKICULTUEE, from Semipalatinsk, Siberia, and the last two from Orenburg, Eussia. Boot systems of similar character are found in Rhus glabra L., Am- brosia psilostachya DC, Cirsium undulatum (Nutt.) Spreng., Con- volvulus arvensis L., Ipomoea leptojjhylla Torr., and numerous other species. The develoj)ment of proliferating roots in certain forms of Medicago faZcata presents a rather interesting situation from a taxonomic standpoint. So far as the writers are aware, there are no othe
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 20 BULLETIN 428, U. S. DEPAETMENT OF AGKICULTUEE, from Semipalatinsk, Siberia, and the last two from Orenburg, Eussia. Boot systems of similar character are found in Rhus glabra L., Am- brosia psilostachya DC, Cirsium undulatum (Nutt.) Spreng., Con- volvulus arvensis L., Ipomoea leptojjhylla Torr., and numerous other species. The develoj)ment of proliferating roots in certain forms of Medicago faZcata presents a rather interesting situation from a taxonomic standpoint. So far as the writers are aware, there are no other species having two forms, one in which this character is present and the other in which it is absent. The tendency to produce rooting rhizomes permits the development of a much more extensive root sj^'stem than is ordinarily found in Medicago sativa. It is characteristic of many of the roots of Medi-. FiG. 7.—Individual plant of Medicago falcata, S. P. I. No. 20717, typical of the forms included in Group I. cago falcata that they possess the ability to produce new plants if cut off at the surface of the ground or if they become exposed acci- dentally. A division of the forms of Medicago falcata into groups may be made on the basis of several characters; for example, color, size, and abundance of flowers, type of pod and seed habits, foliage charac- teristics, stem types, and even root systems to a certain extent. From a strictly botanical standpoint a classification on one or more of these sets of characters would appear to be desirable, but the combinations of characters in the plants are such that a logical grouping along. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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