Portulacaceae Portulaca lutea Sol. Christophersen 34 (BISH), Bryan 1318 (BISH), Marshall 3, 4 (USNM), Long 2388, 2389, 2396, 2402 (UH). Native herb common in flat areas on the north and south side and formerly more abundant on guano soils of the central portion of the island. Portulaca oleracea L. Bryan 1313 (BISH), Marshall 2 (USNM), Long 2154, 2375 (UH). Introduced after Christophersen's 1924 visit. Found on the southwest and northeast sides in 1964. Zygophyllaceae Tribulus cistoides L. Christophersen 26 (BISH), Bryan s. n. (BISH), Marshall 14 (USNM), Long 2156, 2393 (UH). A native herb mentioned by Emerson (1869). Found in 1964 as scattered masses on the interior flat portion of the island, very often in disturbed sites. Euphorbiaceae Euphorbia hirta L. Christophersen 35 (BISH), Bryan 1310 (BISH), Marshall 6 (USNM), Long 2164, 2170, 2365 (UH). Common locally in sand on the southwest end of the island probably introduced during the guano mining operations. Phyllanthus amarus Sch. and Thonn. Christophersen 28 (BISH), Marshall 5 (USNM), Long 2049, 2374 (UH). Probably introduced by guano mining activities and later collected from sand on the west beach crest by Christophersen. Found on the interior of the island in 1964. Tiliaceae Triumfetta procumbens Forst. f. Christophersen 29 (BISH), Bryan 1320 (BISH), Long 2160, 2364 (UH). Prostrate native vine confined to the northwest and north sand beaches, common locally.