.  
14 Bulletin Z\lwhli-er 12.&.` ·» `   _ _ .
l· fine thread—like branches of its widely spreading panicle. The.
-l whole plant is hairy ; when mature it often breaks off and the pan-
Q y icle is then blown about the fields. Itis generally small,_but on  
y   good soil may reach a height of four feet.. _ It is not as troublesome
~ Q   as the preceding, but has no value as forage. The seeds are very ,
l small, and as commonly seen are enclosed in one small and two `
y Q large, ribbed and taper-pointed scales. V When divested of scales the Q
.—   I _. seed is boat-shaped, very glossy, with three paleand a couple of -
L ` broader dusky lines along the convex sidef With the glumes it 1
I . { ` measures 0.08 by 0.04 by 0.03 inch._ When free, it measures 0.06 by »
i . 0.03 by 0.02 inch. Fig. 12, O. D. _   i`
’   y Spreading Panicum (Ptmiczlm pr0liferum).—This is a coarse i ·
‘.   Q smooth grass with large spreading panicle and broad blades, oc-I
A `       curring very commonly in Kentucky fields, being partial to good
I     l I soils along ditches. It may reach a. height of four or more feet. -
      l The seed is very much like that ofwitch-grass, but is~larger, with a
  F I rather abrupt smlall point, and~a blunt base. It is very glossy, .
  Q and commonly shows longitudinal alternating pale and dark lines
    * on the convex side. The general tint is darker than that of the
  e witch grass. The scales enclosing it are also like those of witch-
  , grass, but the apices are less lengthened, and the five ribs of the
Q_i:..I_lf    large scales a trifle more prominent. In the investing scales it e ..
    _ measures 0.16 inch long; The seed measures 0.08 by 0.04 by.0.03
  l meh. Fig. iz, A, B.   " r ° e . .
    Pigeon Grass (Olractocliloa glauca).—'I`his‘is one of the com- ·
    monest of our grass weedsyoccurring in all sorts of situations in \
    grass land, in cultivated Helds, and along roadsides. It is to be
    recognized by the hairy spike-like erect panicle, with a not very re- -
  g mote resemblance to the tail of ayfox. While everywhere common,
  l it is not so hard to get rid of as crab-grass, since it does not send
  g out roots at the joints of the stem, and henoeeis more easily killed.
  j Its seed is possessed of very decided characters by which it can read- ~
  ily be picked out of samples. It is strongly convex on one side, this
  surface showing under a hand magnifier rather coarse, transverse,
    y wavy, ridges (rugaee). It is widest at the middle, the sides rounding
    and contracting to the extremities which are rather blunt. The
    .
  1
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