. Annual white sweet clover and strains of the biennial form . for seed gathering only in the countiesin Alabama mentioned. The harvesting of seed appears to be donemainly about Uniontown and Newbern. Throughout this section theannual plants are found either mixed with the biennial form or inmore or less pure growths in fields or in patches. Since the twovarieties occur in more or less mixed stands, the purity of the seedgathered depends on the ability of the person harvesting to distin-guish the two forms. In the latitude of Washington, D. C, the annual plants begin tobloom at about the time
. Annual white sweet clover and strains of the biennial form . for seed gathering only in the countiesin Alabama mentioned. The harvesting of seed appears to be donemainly about Uniontown and Newbern. Throughout this section theannual plants are found either mixed with the biennial form or inmore or less pure growths in fields or in patches. Since the twovarieties occur in more or less mixed stands, the purity of the seedgathered depends on the ability of the person harvesting to distin-guish the two forms. In the latitude of Washington, D. C, the annual plants begin tobloom at about the time the biennials are in full bloom. Both formshave, however, a long flowering period, and during most of the timefrom the middle of July to September both annuals and biennialsmay be found bearing flowers and young or mature pods. Annual White Sweet Clover. 7 CAN THE ANNUAL PLANTS BE DISTINGUISHED FROM THOSE OFTHE BIENNIAL FORM? The annual and the biennial forms, of course, can be readily dis-tinguished by the roots, as already explained. When harvestino; seed,. Fig. 3.—Typical biennial white sweet-clover plant during the second season. Note thedead stubble of the previous years growth (a) and the many branches from thecrown buds. however, one can not examine all the roots. When the growth of thebiennial form in bloom is typical, it has also a distinctive habit. Theslender stem of the first seasons growth is killed and is represented 8 Department Circular 169, U. S. Dept. of Agriculture. by a stub ot dead tissue. Around this stub and coming from thecrown are two to several strong branches, the growths from the rest-ing buds (fig. 3-). Such branches never occur in the annual form. The habit of growth of the biennial is not always typical, every natural stand,.especially if it is thick, there are a number ofplants with apparently one central stem only. An examination of theroot will show that this stem is not truly central, but has come from alateral resting bud. By the
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