. Bulletin. 1901-13. Agriculture; Agriculture. 22 THE SEEDS OF THE BLUEGRASSES. DESCRIPTIONS OF SPECIES. Poa pratensis L. KENTUCKY BLUEGBAS8, JUNE GBASS. Spikelets 3-5 flowered; florets 2-2f mm., rarely 3 mm., long, lanceolate or fusiform as viewed from the back, lanceolate or ovate-lanceolate as viewed from the side, mostly acute or the terminal floret sometimes acuminate at the apex, glabrous between the veins, varying from light brown to dark brown, sometimes tinged with purple, sterile florets lighter; glume usually sharply keeled quite to the apex and often strongly arched, particularly a
. Bulletin. 1901-13. Agriculture; Agriculture. 22 THE SEEDS OF THE BLUEGRASSES. DESCRIPTIONS OF SPECIES. Poa pratensis L. KENTUCKY BLUEGBAS8, JUNE GBASS. Spikelets 3-5 flowered; florets 2-2f mm., rarely 3 mm., long, lanceolate or fusiform as viewed from the back, lanceolate or ovate-lanceolate as viewed from the side, mostly acute or the terminal floret sometimes acuminate at the apex, glabrous between the veins, varying from light brown to dark brown, sometimes tinged with purple, sterile florets lighter; glume usually sharply keeled quite to the apex and often strongly arched, particularly at the base; its marginal folds comparatively broad, extending from the base nearly or quite to theapex, becoming hyaline-edged above the middle in the lower florets, usually not expanded or flaring at the apex, the edges nearly meeting in sterile florets, separated and usually distended forward in fertile lower florets, often scarcely covering the palea keels of fertile terminal florets, the hyaline edge more or less torn away and the margins jagged at the apex in rubbed commercial seed; intermediate veins distinct and glabrous; keel and mar- ginal veins silky pubescent below the middle or somewhat higher on the keel; basal web well developed; pubescence and web wanting, except occasional traces of the former, in well-rubbed commercial seed; palea nearly or quite as long as the glume, its keels finely hispid-ciliate and usually covered for the greater part of their length by the margins of the glume; rachilla segment slender, glabrous, varying from about one-sixth of the length of the glume in the lower florets to one-half its length in the terminal one; aborted floret of the sterile rachilla segment minute; grain \\ mm. long, somewhat keeled and grooved, often broadest below the middle, reddish brown or darker about the embryo, and semitranslucent. ^Fig. 4.). ah c Fi'.. I.âDifferent forms "f commercial seeds of Kentucky bluegrass (Poa pratensis): a and b, back views; â
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