ON THE APOCINEJE. 241 



PRESTONIA. 



Char. Corolla hypocrateriformis. Faux coronata tubulo 

 annulari indiviso squamisqae 5, interioribus laciniis limbi 

 alternantibus. 



Anther <b semi-exsertae, sagittatae, medio stigtnati cohae- 

 rentes, lobis posticis polline vacuis. 



Ovaria 2. Stylus 1, filiformis, apice dilatato. Stigma 

 turbinatum apiculo angustiore. 



TJrceolus hypogynus, 1-phyllus. 



Folliculi 



Habitus. Frutex volubilis, toraentosus. Folia oppo- 

 sita, tomentosa. Corymbi congesti interpetiolares. Calyx w 

 foliaceus, laciniis basi intus squamula instructis. 



Patria. America Meridionalis. 



P. tomentosa. 



Hab. In sepibus prope Rio de. Janeiro, in Brasilia, de- 

 texit Jbsephus Banks, Baronettus. 



Obs. This genus is named in memory of Dr. Charles 

 Preston, the correspondent of Ray, and styled by him, 

 " eruditissimus vir, et curiosissimus stirpium observator." 

 Many of his observations, chiefly on the more minute 

 plants, occur in Ray's " Methodus emendata." Blair also 

 mentions him as an ingenious and expert botanist. 



BALFOUR! A. 



Char. Corolla infundibuliformis. Faux coronata tu- 

 bulo crenulato. Limbi laciniae rectae, aequilateres. 



Stamina semi-exserta, fauci inserta. Ant her a sagittatae, 

 medio stigmati cohaerentes, raucronatae. 



Ovarium biloculare. Stylus 1, filiformis, apice dilatato. 



Stigma angulatum. 



Squamula 10, basi calycis extra corollam insert ae : hy- 

 pogyna? nulla?. 



Folliculi 



Habitus. Arbor inter minores. Folia opposita, lanceo- 



16 



