’ l 16 Bulletin Number .12.4. vi       _
. i margin, bearing short, but strong bristles. Thedsection of the .{ _
I . l .rachilla present is cylindrical, stronglycurvedinward, and gener- Q i
Y ally enlarges to the obliquely—placed scar at its free extremity. Re- _
I : moved from its glumes, the seed is seen to be pointed at both ends, 8
` I 5 decidedly keeled on one side, and deeply channeled along the other, .
  -l   and measures 0.25 by 0.06 inch. In the glumes, it measures 0.37
- l by 0.07, and the bristles measures 0.34 inch. It is so unlike the ~
·   I small, oval clover seeds, with which it sometimes occurs} that its . S
    ` presence is readily detected; but in orchard grass seed, in which (
  · g- j we most often und it, its shape and .size_are not so ready aqmeans of . t
  . j . detecting it. It is stjll more like the seeds of English bluegrass and " ` ' . {
l i the rye-grasses, where it might pwlienin small_ numbers easily   I
lj y escape observation. There can be no doubt as to its being intro-
`   I 5 duced to new localities with the seeds of valuable grasses, and possi- _
1 gr     1 A bly, in some cases, with oats and wheat. Fig. 7, B, C. t
  E   ·   r . I
·_-_     i Sedge`s'(_Cyperacpae). — ` { k
  ' ‘ Several aadges are common in 'nelds in Kentucky, one of them  
    I known as nut—grass, being in low flat land, rather troublesome as a ` i
,V_.   g weed. In grass and clover seeds, however, I have not observed many I · I
  of the seeds of these plants. Bluegrass seed saniples most often · K) ·  
  ·-`.   p contain them, the following species being the one commonly repre- i ‘ c k
  I _ t sented. i V V 4 0
    { Oval-headed Sedge `(Oarezv ceplv.aloph0m).—Seeds of this C
;,€?Y°?Y..·l;_,;_'   sedge, as occurring in samples, are enwrapped in a llattened, flask- N S
    shaped capsule, rounded at the sides and produced into a sort of _ E
    beak which is notched at its tip. This capsule measures from base 1
    to tip, 0.13 inch; from side to side, 0.08; and is about 0.03 inch 1
  l thick. The seed is much smaller, with rather smooth surface, L  
    rounded at the sides, being widest toward the base,·with a distinct` ‘ ` S
  E whitish basal scar, and an apical knob (or spine, when not broken) S
  i which widens at its attachment to the wall of the seed, Immature {
  j seeds are white, but become brown when mature. A seed measures , I
  l 0.08 from base to tip, 0.06 from side to side and is about 0.02 inch li
  thick. Occurs in both bluegrass and red clover seeds. Fig. 14, O,  
    . D- " t
  F The sedge itself is grass-like, and, as seen in bluegrass pastures, S
* 3  .