. Bulletin. Agriculture. Fig. 5.—Commercial seeds of Canada bluegrass (Poa compressa): a and b, back views; c-e, side views; /-(', front views of florets; i, a terminal floret. o. The .seed of Canada l)lueoTass is the cheapest of the l)IuegTass seeds, and is therefore not adulterated with other Poas. although it is itself' used as an adulterant to a considera))le extent. Pure samples of Canada bluegrass seed almost always contain the prickles and sometimes the seeds of Canada thistle {Carduus arvensis); therefore, the occurrence of these prickles with other kinds indicates the use of this spec
. Bulletin. Agriculture. Fig. 5.—Commercial seeds of Canada bluegrass (Poa compressa): a and b, back views; c-e, side views; /-(', front views of florets; i, a terminal floret. o. The .seed of Canada l)lueoTass is the cheapest of the l)IuegTass seeds, and is therefore not adulterated with other Poas. although it is itself' used as an adulterant to a considera))le extent. Pure samples of Canada bluegrass seed almost always contain the prickles and sometimes the seeds of Canada thistle {Carduus arvensis); therefore, the occurrence of these prickles with other kinds indicates the use of this species as an adulterant. Their occurrence with seed of Poa trwicdh without evidence of the presence of Canada bluegrass seed is noted under the discussion of 1\ trivialis. Poa trivialis L. ROUGH-STALKED MEADOW GRASS. Spikelets 2 or 3 flowered; florets 2-2J mm., rarely 3 mm., long, narrowly lanceolate or the fertile terminal one ovate-lanceolate as viewed from the back, usually lanceolate and curved as viewed from the side, laterally compressed as compared with other spe- cies, straw colored or light brown and sometimes purplish, sharply keeled, the keel somewhat arched; margins of the glume scarcely or but slightly distended, narrowly and rather sharply infolded nearly or quite to the apex, which is hyaline-edged, very acute and rarely expanded; intermediate veins very di.'^tinct as narrow and sharply defined ridges; keel slightly pubescent below the middle, or rarely smooth; marginal veins smooth or sometimes pubescent, basal Aveb present; palea nearly equal to the glume, its keels smooth or finely hispid-cdiate near the apex and mostly covered by the margms of the glume except in the larger termmal florets; rachilla segment very slender, glabrous, varying from one-fourth to one-halt the length of the glume; gram 1-1^mm. long, keeled and grooved, semitranslucent, reddish brown. (Fig. 6.). Please note that these images are extracted from scanned page images that may have been di
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