Identification Tool to Weed Disseminules

This tool aids in the identification of potentially occurring weed disseminules in fresh table grape bunches that are grown in California's Central Valley and destined for export abroad. Disseminules are reproductive dispersal units that can be in the form of seeds, fruits and more complex modified structures.

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Common Yarrow

Achillea millefolium (Asteraceae)
Velvetgrass

Holcus lanatus (Poaceae)
Small-Flowered Catchfly

Silene gallica (Caryophyllaceae)

Grass disseminules

Grass disseminules come in many forms, including the naked fruit (e.g., caryopsis) as well as fruits sheathed by various numbers of bracts (e.g., florets, spikelets). To learn more about grass disseminules and their terminology...

Non-grass disseminules

Non-grass disseminules are typically seeds, fruits (with or without bracts or other modified structures) or specially-designed fruit fragments. Variation among plant families is great. To learn more about this variation and the appropriate terminology...