210 



eyes. Von Martins, 2. 90. Potalia amara is bitter like the Gentians, and 

 acrid and emetic like Apocynese. Dec. Prodr. Med. 217. 

 Examples.' Potalia, Fagrtea, Anthocleista. 



CXCIV. LOGANIACE^. 



LoganiEjE, R. Brown in Flinders, (1814) ; Von Martius N. Gen. et Sp. PI. 2. 133. 



(1828.) 



Diagnosis. Monopetalous dicotyledons, with regular flowers, a supe- 

 rior 2-celled ovarium, a convolute corolla, and opposite leaves with inter- 

 petiolar stipules. 



Anomalies. Stipulse absent in some Loganias. 



Essential Character Calt/,r inferior, 5-parted. Corolla regular or irregular, 



with convolute aestivation. Stamens arising from the corolla, all placed upon the same line, 

 5 or 1, therefore not always symmetrical with the divisions of the corolla ; pollen with 3 

 bands. Ovarium superior, 2- celled; sii/le continuous; stigma simple. Fruit either cap- 

 sular and 2-celled with placentre finally becoming loose ; or drupaceous, with 1- or 2-3eeded 

 stones. Seeds peltate, with a finely reticulated integument, sometimes winged ; albumen 



fleshy or cartilaginous ; embryo with the radicle turned towards the hilum Shrubs, 



herbaceous plants, or trees. Leaves opposite, entire, usually with stipulae which are com- 

 bined in the form of interpetiolary sheaths. Flowers racemose, corymbose, or solitary. 



Affinities. It is not clear, from the remarks upon Logania by Mr, 

 Brown in his Prodromus, whether he intended to establish this order or not. 

 He states that he has placed Logania at the end of Gentianeae, on account 

 of some affinity between it and Exacum and Mitrasacme, and also because it 

 does not answer ill to the artificial character of that order ; adding that it, 

 however, might have a still closer connexion with Apocyneas and with listeria 

 among Rubiaceas (Cinchonaceffi). He further points out the close relation 

 of Geniostoma to Logania, and concludes by inquiring whether those 2 genera 

 do not, with Anasser, Fragrsea, and Usteria, form an order intermediate be- 

 tween Apocyneae and Rubiaceae. This view has been adopted by Von Mar- 

 tius, with the exception of Fagrgea, which he places among his Potaliese ; he 

 founds the distinction of the order upon the want of symmetry between the 

 parts of the calyx, corolla, and stamens, upon the aestivation of the corolla 

 being convolute, not contorted, and in the presence of stipula; combined in 

 interpetiolary sheaths. 



GEOGiiAriiY. Found in tropical India and Africa, and in the temperate 

 parts of New Holland. 



Properties. Unknown. 



Examples. Logania, Gaertneria, Pagamea. 



CXCV. ASCLEPIADE^. 



ApocYNEif;, Jms.5. Gen. 14:t. (1789) m part; Dec. and Dubij Bot. Gall. ^23. (\82fi). — 

 AscLEPiADEiT;, R. Broivn in fVcrn. Trans. 1. 12. (1801)) ; Prodr. 458. (1810.) 



Diagnosis. Monopetalous dicotyledons, with a superior double ova- 

 rium, the apex of which is connected by a common tabular dilated stigma, 

 regular flowers, waxy pollen, and contorted corolla. 



