THE 



EDINBURGH JOURNAL 



OF 



NATURAL AND GEOGRAPHICAL SCIENCE. 



MAY, 1831, 



ORIGINAL ARTICLES. 



Art. I. — On some New Species of Loasece, By G. A. Walker 

 Arnott, Esq. F.L.S. F.R.S.E. &c. 



The following new species of Loasece were collected and 

 given me by Dr Gillies. They are from the mountainous district 

 which separates the province of Mendoza from Chile, comprising 

 from about 32° to 35° south latitude. 



Bartonia. 



1. B» albescens, — Caulis epidermide laxo niveo nitido, foliis 

 sinuato-dentatis, capsula nuda 3-valvi, seminibus late marginatis. 



B. albescens. Gill. MSS. 



Hab. — In the Jarillal or uncultivated grounds between 

 Mendoza and the mountains, generally by the side of dry water- 

 courses, where water is only found after rain ; the elevation above 

 the level of the sea is about 3000 feet. 



This is a decided Bartonia, as far as regards ten petals, a placenta 

 bearing two rows of seeds, and the seeds compressed and very 

 numerous. But the leaves are not pinnatifid, nor are. the flowers 

 large, but, on the contrary, small ; nor are they terminal and 

 solitary, but in a sort of leafy panicle, each branch of which 

 usually consists of one flower on an elongated peduncle, with 

 another sessile near its base. This plant does not turn black in 

 drying, as in the other species, and is readily distinguished from 

 them by the beautiful white loose epidermis of the stem. 



VOL. III. 2 M 



