IN THE CINCHONA FORESTS 281 



the other a beautiful arbuscle, seen only in the valley of San 

 Antonio, where it grows from the very plain up to 2600 feet. 

 The slender stems, of from 8 to 14 feet, are usually simple and 

 arched, and the large white flowers grow in small pendulous 

 corymbs from the axils of very large, elongate, glaucous leaves. . . . 



Crudferce, 2. Apparently species of Sisymbrium, the one 

 growing near streams, the other in open situations ; both in very 

 small quantity. . . . 



Capparidacece. The only species observed was a Cleome, a 

 genus which extends from the plain to a great height on the 

 wooded hills. 



Sterculiacea. A raft-wood tree, Ochroma, is pretty abundant. 

 Another tree of the same order (not seen in flower) appears to be 

 a Chorisia. 



Biittneriacea, i. A rampant Melochia. Muntingia Calaburii, 

 a tree found in the plains on both sides of the Cordillera, grows 

 abundantly by the Rio San Antonio, up to 2500 feet. 



Malvacetz, 2. Four or five common weeds, whereof Sida 

 glomerata, Cav., is the most plentiful, comprise all that was seen 

 of this order. 



Tiliacecc, i. A very handsome tree, with a slender straight 

 trunk, reaching 60 feet, very long branches, large, ligulate, serrated, 

 distichous leaves, and terminal panicles (sometimes 4 feet long) 

 of yellow flowers, scented like those of Tilia Eurofcca ; it is 

 abundant and ornamental about the middle region of the Red 

 Bark. Besides this tree, another of the same order (apparently 

 a Heliocarpus), growing to about 30 feet, is also frequent. . . . 



/'ii/v^(i/(.'(>\ 2. A Monnina and Palygala paniculate, L. . . . 

 The Polygala of the Bark woods is the common and almost the 

 only species of the equatorial Andes, on whose western slopes it 

 descends to the plain, and does not seem to ascend higher than 7000 

 feet on either side, nor is it abundant at any elevation. When 

 I recollect the abundance of Polygala ntl^aris on cold English 

 moors, I am struck with this paucity of Polygala; in the Andes, 

 and still more when I compare it with their abundance and 

 variety on hot savannas of the Orinoco, and in hollows of 

 granite rocks by the Atabapo. 



.SVyVW; ?<<;/, i. A woody climbing Serjania, a fine plant. 

 A Paullinia with trigonous stems is frequent, and is the common 

 substitute for rope, uhere much strength is not required. 1 saw 

 no llowers of it, and only empty capsules. There is also a 

 Cardiospermum, which I have seen on both sides of the Cordillera 

 up to 7500 feet, and this is the greatest elevation at which 1 have 

 noied any Sapindacea, an order which abounds in the hot plains. 



Malpigkiacetz, i.~-A twiner, with fruit too young to enable 

 me to speak positively of the genus. Plants of this order, which 

 constitute so large a proportion of the vegetation of the plains, 



