. Contributions to North American Euphorbiaceae--VI. II. Vegetation of Alacran Reef. Botany -- Alacran Reef; Euphorbiaceae. 430 Field Museum of Natural History — Botany, Vol. II 13. Cenchrus carolinianus Walt. This species* was found only at one spot, that on the south shore of Perez Island near the clumps of Conocarpus at the edge of the Sporo- bolus colony at that point. The species has also been returned from Cozumel Island but not from the Yucatan mainland. The species is avevectent through the spiny burs clinging to the webbed feet of the booby. 14. Cenchrus insularis Scribn. Field Mus. B
. Contributions to North American Euphorbiaceae--VI. II. Vegetation of Alacran Reef. Botany -- Alacran Reef; Euphorbiaceae. 430 Field Museum of Natural History — Botany, Vol. II 13. Cenchrus carolinianus Walt. This species* was found only at one spot, that on the south shore of Perez Island near the clumps of Conocarpus at the edge of the Sporo- bolus colony at that point. The species has also been returned from Cozumel Island but not from the Yucatan mainland. The species is avevectent through the spiny burs clinging to the webbed feet of the booby. 14. Cenchrus insularis Scribn. Field Mus. Bot. 2:26. This new species is represented by a few plantst on Pajaros Island only. These were all in full ripe fruit. That this is the full representa- tion of so strongly a differentiated species is open to doubt and will so. C. insularis. C. echinatus remain until opportunity is had to visit Utowana Cay, where it would seem more than probable that a fuller growth may be found. The characters clearly differentiate this species from C. carolinianus as fotmd on Perez Island; in many of its characters it is much nearer C. echinatus as found abundantly on cultivated lands near Izamal, eighty miles inland on the main, and on the rocky plain south of Pro- greso. I am strongly inclined to judge the latter species to be its parent- age. The fruiting characters of the two species are here illustrated in conjunction. The species differ in the size of inflorescence; number and size of the involucres; character of the basal bristles (barbellate in *Reported as C. tribuloides L. in Field Mus. Bot. 2144. tThe specimen from Cozumel reported as this species under the description of the type proves to be C. caroUnianus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Millspaugh, Charles Frederick, 1854-1923. Chicago
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