201.56-10—Spurge family, Euphorbiaceae.
Kind of seed: Castorbean.
(1)
Germination habit: Epigeal dicot.
(2)
Food reserves: Cotyledons, which are thin and leaf-like; endosperm (fleshy food-storage organs) usually persisting in the laboratory test.
(3)
Shoot system: The hypocotyl lengthens, carrying the cotyledons, endosperm, and epicotyl above the soil surface.
(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.
(ii)
Damaged or missing terminal bud.
(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]