Current through October 31, 2024
Section 201.56-10 - Spurge family, EuphorbiaceaeKind 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.(3) Epicotyl:(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:(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.59 FR 64505 Dec. 14, 1994