3G0 Dr. Arnott on the Genus Rhizophora. 



order Wlizophorea, and to contain several distinct forms. The 



group or sub-order may be defined as follows: 



Calyx 4 — 12-fidus, penistens: eestivatio valvata. Petals senilis 4 — 14, 

 calyci inscrta ac ejus lobia altcrnantia. Stamina 8 vol plum, ibidem 

 inserta : filamenta discrete : anthers biloculares, longitudinaliter intus 



dehisccntes. Discus carnosus inter ovarium ct calycem, quandoque 

 inter ovarium ct stamina in annulum brevcm dentatum productus. 

 Ovarium plus minusvc coba-rens, 2 — 1 loculare, loculis biovulatis, ra- 

 rius dissepimentis obsoletis uniloculare G-ovulatum : ovula ad apicem 

 axis centralis suspensa?. Stylus unicus. Stigma 2 — 1-dentatum vel 

 simpliciusculum. Fructus coriaceus, unilocularis, monospermus, ad 

 apicem, inchoantc gcrminatione, embryonis radicula et tigello in cla- 

 vam longissimam productis perforatus. Semen pendulum. Albumen 

 nullum. Cotyledones plana?. Radicula supera. — Arborcs maritimae 

 omnino fere tropica?, ramis oppositis. Folia simplicia, opposita, intc- 

 gerrima, coriacea, glabra. Stipulae interpetiolares, convoluta?, caducae. 

 Pedunculi axillares. 



To the above De Candolle adds that the petals are furnished 

 with two bristles or awns at the apex. In the particular spe- 

 cies he had examined there are three bristles, but in several 

 others there are none whatever. His description of the sta- 

 mens and ovary is likewise too limited, and consequently in- 

 applicable to several species. 



In the f Encyclopedic Methodique' and c Illustrations des 

 Genres/ Lamarck separated from the true species of Rhizo- 

 phora the R. gymnorrhiza under the name of Bruguieria. 

 This new genus was adopted in 1834, in the Prodr. Flor. 

 Penins. Ind. Or. i. p. 311, by Dr. Wight and myself, with a 

 character in some respects too enlarged, and in others too re- 

 stricted, although suitable to the species we had then in view ; 

 but a few years previous (in 1827), Blume had also adopted 

 it in his ' Enumeratio Plant. Javae/ — a work with which we 

 were then unacquainted. Blume's generic character of Bru- 

 (jideria, applicable to the species from Java and the Moluccas, 

 differs in several points from what we proposed, and it be- 

 comes therefore necessary to extend both a little, in order to 

 contain all the species. 



Dr. Wight, in the course of some excursions he made to 

 t he salt marshes in the neighbourhood of Quilon in Decem- 

 ber 1835 and June 1836, was so fortunate as to collect not 

 only all the former species wc described in the Proclromus, 



