Kind of seed: Flax.

1. (a) General description.

   1. (1) Germination habit: Epigeal dicot. (Due to the mucilaginous nature of the seed coat, seedlings germinated on blotters may adhere to the blotter and appear to be negatively geotropic.)
   2. (2) Food reserves: Cotyledons which expand and become photosynthetic.
   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 usually developing within the test period.

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 extending into the conducting tissue.
      2. (ii) Malformed, such as markedly shortened, curled, or thickened.

   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 64505 Dec. 14, 1994]