§ 201.56-11 - Knotweed family, Polygonaceae.

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Kinds of seed: Buckwheat, rhubarb, and sorrel.

General description.

Germination habit: Epigeal dicot.

Food reserves: Cotyledons, starchy endosperm.

Shoot system: The hypocotyl elongates carrying the cotyledons above the soil surface. The epicotyl usually does not show any development within the test period.

Root system: A primary root, with secondary roots developing within the test period for some kinds.

Abnormal seedling description.

Cotyledons:

Less than half of the original cotyledon tissue remaining attached.

Less than half of the original cotyledon tissue free of necrosis or decay.

Epicotyl:

Missing. (May be assumed to be present if cotyledons are intact.)

[Reserved]

Hypocotyl:

Deep open cracks or grainy lesions extending into the conducting tissue.

Malformed, such as markedly shortened, curled, or thickened.

Watery.

Root:

None.

Weak, stubby, or missing primary root with weak secondary or adventitious roots.

Seedling:

One or more essential structures impaired as a result of decay from primary infection.

Albino.