Kind of seed: Castorbean.

1. (a) General description.

   1. (1) Germination habit: Epigeal dicot.
   2. (2) Food reserves: Cotyledons, which are thin and leaf-like; endosperm (fleshy food-storage organs) usually persisting in the laboratory test.
   3. (3) Shoot system: The hypocotyl lengthens, carrying the cotyledons, endosperm, and epicotyl above the soil surface.
   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) Endosperm:

      1. (i) Missing.
      2. (ii) [Reserved]

   3. (3) Epicotyl:

      1. (i) Missing.
      2. (ii) Damaged or missing terminal bud.

   4. (4) Hypocotyl:

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

   5. (5) Root:

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

   6. (6) 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]