AUSTRAL-AMERICAN REGIONS. 



79 



Mamillaria ? (No. 1). Buried, so as to leave its broad green summit even witli the sur- 

 face of the ground. Growing on the marginal slope of the Upland plain. 



" Cereus " (No. 6). Melocactiform ; but sometimes agglomerated. Growing on the tract 

 of sand-hillocks. 



Opuntia (No. 6). Normal ; though by no means conspicuous. Growing along the margin 

 of the Upland plain. 



" " (No. 7). Remarkable for its stem-joints being ovoid or egg-shaped, not in 



the least compressed. 



" " (No. 8). Another remarkable though inconspicuous species ; its stem-joints 



slender, and cylindrical. Growing along the margin of the Upland plain. 



Hydrocotyle (No. 17). Growing along the river-bank, within reach of the infiltration. 



(No. 18) ; larger. Growing along the river-bank, within reach of the infiltra- 

 tion. The specimens lost. 



Mulinum (No. 1). Herbaceous, but rigid, with leaves like trifid spines; the fruit com- 

 pressed. Growing in bunch-like tufts on the Upland plain. 



Eryngium (No. 5). Upright, with the stem nearly naked; capit. cylindrical. On the 

 river-bank, within reach of the infiltration. 



(No. 6). Annual ; prostrate ; the fruit hispid and warty. On the river-bank, 



within reach of the infiltration. 



(Apium graveolens ? ; compare Chili, and No. 1 New Zealand and Australia) ; the fruit 

 with ten ribs. On the river-bank, within reach of the infiltration. 



Galium (No. 19). Rigid, three to four inches high. On the tract of sand-hillocks. 



(Boopis Anthemoides, No. 1); gen. Calycer. Leaves pinnatisect; involucre monophyl- 

 lous ; receptacle with long attenuate chaffs. 



Gen. Calycer. ? (No. 1); calyx monophyllous. Maritime; growing on the sea-shore. 



(Picrosia? No. 1). Sonchus-like ; with smooth entire leaves. The flowers yellow. 



Gen. Sonchus-like (No. 1) ; the flowers white. 



(Cyclolepis genistoides? No. 1); gen. Compos. Habit of Genista; but with larger and 



coarser branches. On the Upland plain. 

 (Trichocline ? No. 1); gen. Compos. Habit of Gorteria; stemless; the leaves sinuate. 



On the Upland plain. 



(Chuquiraga erinacea? No. 1). A shrub, having short linear pungent leaves ; the flowers 

 yellow, Helichrysum-like, with scarious unfading calyx-scales. Frequent on the Up- 

 land plain, and elsewhere. 



(Hyalis argentea. No. 1). Highly ornamental; the whole plant covered with silvery 

 pubescence ; the leaves oblique ; the flowers varying from rose-colored to white ; the 

 involucre containing five florets. Frequent on the Upland plain, and elsewhere. 



IVfalus sylvestris, (bis Yemen, New Zealand, Australia, Brazil, and the United States). 



. A single apple floating down the river; being the only sign of cultivation met with. 

 Amygdalus Persica, (bis Brazil, Hawaiian Islands, Zanzibar, New Zealand, Australia, 



and the United States). Peaches, said to be produced " near the town ; about twenty 



miles" from the mouth of the river. 

 Daucus (compare Chili, Hawaiian mountain-region. New Zealand, Australia, and the 



United States). Annual. On the tract of sand-hillocks, growing spontaneously, but 



doubtless introduced. 



