201.56-8—Flax family, Linaceae.
Kind of seed: Flax.
(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)
Food reserves: Cotyledons which expand and become photosynthetic.
(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)
Root system: A primary root, with secondary roots usually developing within the test period.
(b)
Abnormal seedling description.
(i)
Less than half of the original cotyledon tissue remaining attached.
(ii)
Less than half of the original cotyledon tissue free of necrosis or decay.
(i)
Missing. (May be assumed to be present if cotyledons are intact.)
(i)
Deep open cracks extending into the conducting tissue.
(ii)
Malformed, such as markedly shortened, curled, or thickened.
(ii)
Weak, stubby, or missing primary root with weak secondary or adventitious roots.
(i)
One or more essential structures impaired as a result of decay from primary infection.
Code of Federal Regulations
[59 FR 64505 Dec. 14, 1994]