Kinds of seed: Buckwheat, rhubarb, and sorrel.

1. (a) General description.

   1. (1) Germination habit: Epigeal dicot.
   2. (2) Food reserves: Cotyledons, starchy endosperm.
   3. (3) Shoot system: The hypocotyl elongates carrying the cotyledons above the soil surface. The epicotyl usually does not show any development within the test period.
   4. (4) Root system: A primary root, with secondary roots developing within the test period for some kinds.

2. (b) Abnormal seedling description.

   1. (1) Cotyledons:

      1. (i) Less than half of the original cotyledon tissue remaining attached.
      2. (ii) Less than half of the original cotyledon tissue free of necrosis or decay.

   2. (2) Epicotyl:

      1. (i) Missing. (May be assumed to be present if cotyledons are intact.)
      2. (ii) [Reserved]

   3. (3) Hypocotyl:

      1. (i) Deep open cracks or grainy lesions extending into the conducting tissue.
      2. (ii) Malformed, such as markedly shortened, curled, or thickened.
      3. (iii) Watery.

   4. (4) Root:

      1. (i) None.
      2. (ii) Weak, stubby, or missing primary root with weak secondary or adventitious roots.

   5. (5) Seedling:

      1. (i) One or more essential structures impaired as a result of decay from primary infection.
      2. (ii) Albino.

[59 FR 64506, Dec. 14, 1994]