. Bulletin. 1901-13. Agriculture; Agriculture. 38 THE SEEDS OF THE BLUEGRASSES. the apex; surface sometimes slightly grooved or ridged lengthwise, otherwise smooth; color varying from light brown to greenish or dark brown. (Fig. 34.) Seeds of sedge (Carex) are found in both American and European bluegrass seed. Owing to the wide area of their production, the seeds of various species of Carex occur in commercial blue- grass seed. The seeds of Carex are fruits (akenes) and occur free or in- closed within a sac-like covering (the perigynium). Carex cephalopkora is Fig. sedge {Carex ce
. Bulletin. 1901-13. Agriculture; Agriculture. 38 THE SEEDS OF THE BLUEGRASSES. the apex; surface sometimes slightly grooved or ridged lengthwise, otherwise smooth; color varying from light brown to greenish or dark brown. (Fig. 34.) Seeds of sedge (Carex) are found in both American and European bluegrass seed. Owing to the wide area of their production, the seeds of various species of Carex occur in commercial blue- grass seed. The seeds of Carex are fruits (akenes) and occur free or in- closed within a sac-like covering (the perigynium). Carex cephalopkora is Fig. sedge {Carex ceptolophoray. a, seeds ^ -^ mQgt n>mmonly found in inclosed by the perigvnium; '< and c, seeds with r perigynium removed: d, natural size of seeds. Kentucky bluegrass ERGOT OCCASIONALLY FOUND IN COMMERCIAL BLUEGRASS SEED. Claviceps purpurea (Fr.) Tul. This is a fungus growth affecting the grain (caryopsis) of many grasses. It is very common in the seed of redtop and other species of Agrostis, and occasionally occurs in bluegrass seed. The grain of the seed becomes elongated, extending beyond the glume and palea, attains about twice the length of the glume, and is club-shaped, straight, or, more commonly, somewhat curved. It is black, dull, and somewhat grooved lengthwise. (Fig. 35.) I a Fig. 35.—Ergot (Clavi- cepspurpurea \ of Ken tucky bluegrass: a,en- larged; b, natural size. o. 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, Soils, and Agricultural Engineering. Washington Govt. Print. Off
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