. Bulletin. Agriculture. 32 THE SEEDS OF THE BLUEGRASSES. WEED SEEDS COMMONLY FOUND WITH COMMERCIAL BLTJE- GBASS SEEDS. The following weed seeds are those most frequently found with the various kinds of bluegrass seed. Bursa bursa-pastoris (L.) Britton. shepherd's-purse. Seeds f-1 mm. long, oval-oblong, one extremity of ten pointed by the whitish tissue of the scar, flattened with rounded edges; faces similar and usually presenting two shal- low grooves; color yellowish orreddish brown, usually darker near the scar; surface nearly smooth; endosperm absent; embryo curved upon itself, the cotyle
. Bulletin. Agriculture. 32 THE SEEDS OF THE BLUEGRASSES. WEED SEEDS COMMONLY FOUND WITH COMMERCIAL BLTJE- GBASS SEEDS. The following weed seeds are those most frequently found with the various kinds of bluegrass seed. Bursa bursa-pastoris (L.) Britton. shepherd's-purse. Seeds f-1 mm. long, oval-oblong, one extremity of ten pointed by the whitish tissue of the scar, flattened with rounded edges; faces similar and usually presenting two shal- low grooves; color yellowish orreddish brown, usually darker near the scar; surface nearly smooth; endosperm absent; embryo curved upon itself, the cotyledons incumbent; seeds developing a coat of transparent mucilage when placed in water. (Fig. 16.) Seldom found abundantly, but occurring frequently in all of the commercial bluegrasa Fig. 16.—Seeds of shepherd's-purse (Bursa bursa-pastoris): a, side view; b, edge view; c, natural size of 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. Bureau of Plant Industry. Washington : G. P. O.
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