BOTANY OF TERRA AUSTRALTS. 37 



APOCINE^..^ T have already observed" that this order 

 is very nearly related to Rubiaceae and Gentianea^ ; the [504 

 former appearing to differ cliiefly in its remarkable stipiila), 

 the latter in its minute embryo. If these characters be 

 admitted, certain New Holland genera which I have placed 

 with GentiancEe will either be transferred to Rubiaceae, or, 

 as I have formerly proposed,^ may, with some others, con- 

 stitute a family intermediate to Rubiaceae and Apocineae. 



This order or section, which may be named Logane.e, 

 will consist of Logania, Geniostoma (from which Anasser 

 of Jussieu is not distinct), listeria, Gaertnera of Lamarck,* 

 Pagamea of Aublet, and, perhaps, Fagraca. Of these, the 

 only New Holland genus is Lo(/ania, the greater part of 

 whose species are found in the principal parallel. In this 

 genus, which admits, however, of subdivision, the import- 

 ance of stipulation seems to be entirely lost, for it contains 

 species agreeing in this respect with Rubiaceae, others in 

 which the stipulae are lateral and distinct, and one species, 

 at least, in which they are entirely wanting. 



There is an evident affinity between certain species of 

 Logania and Mitrasacme, which I had therefore placed in 

 Gentianeae. Mitrasacme is very general in Terra Australis, 

 but its maximum is within the tropic ; it is not absolutely 

 confined to New Holland, for I have observed in the Sher- 

 ardian Herbarium two species collected at Cheusan, by Mr. 

 Cunningham. 



Among the true Apocineae of New Holland, which are 

 chiefly found within the tropic, the most remarkable genus 

 is Alyxia, in which the albumen and embryo agree with 

 those of the very different family Annonaceae. 



ASCLEPIADEJ^.^ These plants differ from Apocineae 

 solely in the peculiar structure of their genitalia, a charac- 

 ter, however, which appears to me fully sufficient to justify 

 their separation. They are not very numerous in ^e\v 



^ Prodr.fl. Nov. Boll. 465. Apociiiearum pars, Juss. gen. 11-3. 

 ^ Werner, soc. transact. 1, ;;. 12. 



3 Prodr.fl. Nov. Holl. 455. ^ Illustr. gen. tab. 107. 



^ Werner, soc. transact. \^p. 12; Prodr.fl. Noo. Holl. 458. 



