Spermacoce exilis
[Toothed Buttonweed, Pacific False Buttonweed]

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DSC07883 (12)
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DSC07884 (12)
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DSC03391 (09)
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P5130210 (17)
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DSC03389 (09)

Close-up views:

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P5130213 (17)
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P5010131 (17)