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Confirmation needed. S. arecifolium is very similar as well. Both seem to be non-native. It is the spiniest plant I’ve seen in Florida so far and the only specimen I saw in this preserve. It was on the side of the trail.

PTBG herbarium (Wood 3329)
last known individual observed on Guam at Andersen Air Force Base; between Pati & Late Pt. around Bikkia tetrandra limestone cliffs w/ rich Aglaia mariannensis forests at base of cliffs. Elev. 300-550 ft.

I found this buffalo bur growing by the side of an asphalt street in Del Norte CO, in July 2019. In July of 2022 another plant was observed three blocks away . Although Ackerfield, Flora of Colorado, 2nd ed., 2022 does not show Solanum rostratum as present in the San Luis Valley of Colorado, it has been recorded from there in 1982, 1983, and 1984. These and the Del Norte occurrences indicate the species has persisted on ruderal ground in the upper Rio Grande watershed of Colorado.

Both this and the glossy-leaved S. prinophyllum popped up under a big tree after I had herbicided out the grasses, trying to get rid of a weedy grass and encourage natives like Dichondra to take over that spot. Didn't quite work out, and now the presence of these prickly little devils is making weeding in that location even more difficult. This is pungetium because of the covering of fine stellate hairs on the leaf upper surface, making it dull, not glossy. Both are post-disturbance colonisers.