COROCORO COPPER DISTRICT OF BOLIVIA in 



. E-ngelhardt has described ( i ) a form from Potosi which 

 he refers to the allied genus Gaylussacia but which may 

 represent an allied species of Vaccinium. It shows con- 

 siderable minor contrast to the present species although 

 of the same general type. The present is one of the few 

 species found at Corocoro that have not been recognized 

 in the large collections made at Potosi. 



Order RUB I ALES 



Family RUBIACE^E 



Genus Rubiacites WEBER 



Rubiacites nummularioides BERRY 



PLATE VII Fig. 7. 



Rubiacites nummularioides Berry, Proc. U. S. Natl. Mus., vol. 

 54, p. 161, pi. 18, fig. 15, 1917. 



Description. Leaves small, ovate, or broadly elliptical 

 in outline, relative long petiolate, widest in the middle, 

 with a somewhat narrowed rounded tip and a broadly 

 cuneate base. Margins entire. Texture coriaceous. Length, 

 about 4 mm. Maximum width, about 3 mm. Petiole 

 stout, curved, about 1.5 mm. in length. Midrib stout. 

 Secondaries thin, subparallel, openly camptodrome. Ter- 

 tiaries obsolete. The Corocoro material, identical in form 

 with the type material from Potosi, shows slightly larger 

 leaves i cm. in length by 6 mm. in maximum width and a 

 relatively stout petiole 4 mm. in length. 



These small leaves are somewhat suggestive of some 

 species of Celestraceae, but upon the whole their closest 

 affinities appear to be with several existing genera of 

 Rubiaceae, and they are consequently referred to the form 

 genus Rubiacites proposed by Weber for Rubiaceous leaves 

 of uncertain generic affinity. Ignoring the exclusively 

 herbaceous genera comparisons may be made with various 



'Engelhardt, H., Sitz. Naturw. Gesell. Isis in Dresden, 1894, Abh. 

 i, p. 6, pi. i, figs. 8, 9. 



