GENERA RADAMJEA AND NESOGENES. 315 
‘aulina opposita, distincte petiolata, crassiuscula, ovato-lanceolata vel oblonga, 
maxima visa cum petiolo circiter 2 em. longa, sursum gradatim minora, vix 
acuta. Flores parvi, in axillis foliorum sspissime solitarii, brevissime 
pedicellati, Calyx anguste campanulatus, 4-5 mm. longus, fructifer paulo 
auctus, rigidus, intus extusque dense glanduloso-pilosus, fere :equaliter 
2-dentatus, 10-nervis : dentes acuti, quam tubus breviores, demum patentes. 
Corolla glabra, 1-1°3 em. longa, subinfundibularis, ore leviter obliquo ; tubus 
basi angustissimus, sursum paulo ampliatus; limbi lobi 5, breves, quorum 4 
subeequales, fere orbiculares, quinto antico latiore. Stamina 4, subsequalia, 
inclusa vel e tubo brevissime exserta ; filamenta filiformia, nuda ; anthers 
biloculares, basi affix:e, loculis ovatis fere a basi liberis inversis aristulatis. 
Ovarium oblongum, apice puberulum, 2-loculare, loculis l-ovulatis ; ovula 
erecta ; stylus filiformis glaber, inclusus, stigmate parvo capitato. Fructus 
subearnosus, calyce inclusus, dispermus ; semina perfecta non visa. 
Aldabra : P. R. Dupont, 97 ; H. P. Thomasset, 261. 
Assumption: P. R. Dupont, 1006. 
Other specimens collected by Dupont were destroyed by insects. 
NESOGENES species nova? habitu foliisque N. prostrata simillima sed 
florum structura vix a N. Dupontü differt. 
Aldabra: H. P. Thomasset, 236. 
The flowers of N. prostrata are still imperfectly known and the extent of 
variation in habit and foliage, due to local conditions, of any species is un- 
certain. The specimens of both this and N. prostrata, in spite of the name, 
have the appearance of erect growth ; yet both have traces of adventitious 
roots on some of the branches. In the absence of complete material I decide 
not to give this a name. 
From the geographical particulars given under the several species 
it will be seen that the genus JVesogenes is restricted to Coral Islands, 
or eoral formation, in two very distant, relatively small areas within the 
southern tropic ; the one in the Pacifie Ocean with a median longitude of 
about 145? W.; the other in the Indian Ocean with a median longitude of 
about 60? E. This is all that is at present known of the distribution of the 
genus, but as the species are all very inconspicuous plants and much remains 
to be done in the botanical investigation of the region eastward from the 
Indian Ocean to the Low Archipelago, it is highly probable that intermediate 
stations may yet be discovered. On the other hand instances of genera, and 
even of species, occupying widely distant continental areas are not unknown, 
and the present conditions may be the result of disappearance from the 
intervening country due to physical changes. But it is not my intention to 
pursue the discussion of the question in this connection, and I will only 
