Podostemacece. 165 



IX.— CYATHOCLINE LUTEA. 



1. Entire plant, natural size. 



2. Capitulum. 



3. cut vertically, showing the form of the receptacle 



and flowers in situ. 



4. Male flowers. 



5. Cut open, showing the stamens and sterile style. 



6. Detached anthers. 



7. Female flower and ovary. 



8. Achsenium. 



9. A detached leaf, all magnified. 



Observations on the Structure and Affinities of the Plants be- 

 longing to the natural order Podostemacece, together with 

 a Monograph of the Indian species. By George Gard- 

 ner, F.L.S. Superintendent of the Royal Botanic Gar- 

 dens, Ceylon. 



The natural order Podostemacece, one of the most re- 

 markable, as well as the most Protean, in the vegetable king- 

 dom, has representatives in nearly all parts of the world 

 within the tropics, although it is, comparatively speaking, 

 but recently that Botanists have become acquainted with 

 them. About seventy years ago, the first species was made 

 known by Aublet in his valuable work on the plants of French 

 Guiana, under the name of Mourera fluviatilis, and about 

 twenty years afterwards, viz. in 1803, a North American 

 species was published by Richard in the ' Flora Boreali 

 Americana* of Michaux, under the name of Podostemon 

 ceratophyllum. Since that period, many new species have 

 been described, principally from Brazil, Guiana, and Mada- 

 gascar, and some new genera established. Until the publi- 

 cation of Dr. Wallich's Catalogue, which bears the date of 

 1828, no species was known to exist in the East Indies. In 

 it we find a solitary species of Podostemon (P. Wallichii 

 R. Br.,) enumerated under number 5225, which was found 

 ' by Gomez in the mountains of Sylhet. In the year 1835, the 



