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Sesuvium portulacastrum . The Tanager Expedition members found 
this species growing within reach of the spray on the southern slopes 
of Annexation Hill. Although I noticed one or two isolated plants on 
the northeast side of Annexation Hill., near the top, the population-- 
a sparse one--was limited primarily to the southern slope of the saddle 
between this and Flagpole Hill. 
Portulaca lutea . As on previous reports, Portulaca was common on 
the flat tops and ledges of the cliffs. Except for a rare Chenopodium 
shrubs it was the only plant growing on Northwest Cape--in cracks and 
in shallow pockets of soil. Some plants on the summit of Flagpole Hill 
A. 
appeared intermediate between P. lutea and P. oleracea . Long (12) cites 
a white form found by J. W. Beardsley; although I searched the same 
area, I was unable to find another; the disposition of the original 
collection is unknown. 
Sesbania tomentosa . Christophersen and Caum observed a few plants 
along the top of the main part of the island. Kramer (10) concurs 
and adds that it "seems to be holding its own quite well." I found 
this shrub on the tops of all of the hills, except the Northwest Cape, 
and consider it more common than previous authors indicate. 
The following list comprises all known specimens of vascular 
plants collected from Necker Island. Three species-- Panicum torridum, 
Chenopodium oahuense and Sesbania tomentosa- -are endemic to Hawaii, 
while the other two are widespread throughout the Pacific Islands. 
Lists of lichens from this island may be found in Magnussen (13); 
Tsuda (16) lists marine algae. 
