VEGETATION AT SANTAREM 159 
fistulifera, Mart., notable, like many of its con- 
geners, for its long twiggy fistulose branches, which 
are in common use on the Amazon as tubes for 
tobacco pipes, under the name of Tacuari. The 
same species had previously been gathered by 
Pohl and Martins in the provinces of Minas, Goyaz, 
etc. There was one very fine tree in the serras, 
and also in stony places on the campo, towards San- 
tarem — Salvertia convallarioides, St. HiL, a Vochy- 
siad. It grew 30 to 40 feet high, and the leaves 
and branches being arranged in whorls, six or 
seven together, gave the tree a symmetrical, can- 
delabrum-like aspect, which was rendered more 
striking by the branches being upturned at their 
extremity and bearing each a panicle of large white 
hexapetalous flowers. These had the delightful 
scent of the Lily of the Valley, so that in walking 
through a grove of Salvertias in flower, I was con- 
stantly reminded of that charming though lowly 
plant. In drying, they assumed the still richer 
odour of the Violet. 
In stony valleys grew Lafoensia densiflora, St. 
Hil., a small tree with large curious flowers not 
unlike those of the Pomegranate, but white instead 
of red. The Mabea, the Salvertia, and the Lafoensia 
grow all through the hilly campos of tropical Brazil. 
I did not see them elsewhere in the Amazon valley, 
any more than Strychnos brasiliensis and other 
South Brazilian plants gathered by myself only at 
Santarem. 
Although I did not visit the hills of Monte 
Alegre, yet, as they are evidently a continuation of 
those of Santarem and have quite the same char- 
acter, and as I was told by Mr. Wallace that he 
