§ 201.56-10 Spurge family, Euphorbiaceae.

Kind of seed: Castorbean. (a) General description. (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. (1) Cotyledons: (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. (2) Endosperm: (i) Missing. (ii) [Reserved] (3) Epicotyl: (i) Missing. (ii) Damaged or missing terminal bud. (4) Hypocotyl: (i) Deep open cracks extending into the conducting tissue. (ii) Malformed, such as markedly shortened, curled, or thickened. (5) Root: (i) None. (ii) Weak, stubby, or missing primary root with weak secondary or adventitious roots. (6) Seedling: (i) One or more essential structures impaired as a result of decay from primary infection. (ii) Albino. [59 FR 64505 Dec. 14, 1994]