§ 201.56-10 - Spurge family, Euphorbiaceae.

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Kind of seed: Castorbean.

General description.

Germination habit: Epigeal dicot.

Food reserves: Cotyledons, which are thin and leaf-like; endosperm (fleshy food-storage organs) usually persisting in the laboratory test.

Shoot system: The hypocotyl lengthens, carrying the cotyledons, endosperm, and epicotyl above the soil surface.

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

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.

Endosperm:

Missing.

[Reserved]

Epicotyl:

Missing.

Damaged or missing terminal bud.

Hypocotyl:

Deep open cracks extending into the conducting tissue.

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

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.