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Family Asteraceae:  Determination of the Pure Seed Unit

Examples of native Asteraceae species currently being tested in the laboratory

Species
Achillea millefolium (PSU 27)*
Artemisia tridentata (PSU 27)*
Coreopsis tinctoria (PSU 28)*
Encelia californica
Eriophyllum confertiflorum
Gazania rigens
(PSU 28)*
Hemizonia fasciculata
Lasthenia californica
Layia platyglossa
(PSU 28)*

Figure 9 - Encelia californica - Encelia

Samples contain many translucent, obviously empty achenes.
 Photographed using transmitted light (diaphanoscope).

 

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