Rio Huallaga. There were two separate clumps of plants, 
rooted about one and one half to two meters above the 
water level, at that time. The plants had green stalks; 
the leaves were of medium width; and the plants were in 
full bloom. ‘Travelling northwards by motor boat, I 
could not find any other clumps of T’ripsacum, even 
though I scanned both sides of the river at normal cruis- 
ing speed. Further explorations of Huallaga affluents 
were not carried out, except in the lower Rio Mayo sec- 
tion. On the Mayo, near its confluence with the Hual- 
laga, abundant masses of plants which resembled 7'7ipsa- 
cum were found on high river banks. Collections were 
made for transplanting. These plants had red stalks, 
hairy sheaths and narrow leaves. No herbarium speci- 
mens of this colony were preserved, and since the plants 
had not developed inflorescences, no positive identifica- 
tion was possible. 
A third and large mass of T’ripsacum with fully de- 
veloped inflorescences was found along the road between 
the Tarapoto and Granja Porvenir, a livestock farm 
operated by SIPA (a dependency of the Peruvian Min- 
istry of Agriculture). These plants had sun-red leaf 
sheaths, and they were rather hairy and had rather nar- 
row leaves. 
Live plants from all three sites were planted at the 
Granja Porvenir near Tarapoto, but unfortunately the 
plants that survived transplanting were destroyed during 
construction work. 
[t was possible for me to collect herbarium material 
in full bloom again in 1964 along the road from Granja 
Porvenir to Tarapoto. These were compared at the Bo- 
tanical Museum of Harvard University with herbarium 
specimens of J'ripsacum australe collected by Cutler. I 
carried out this comparison in the winter of 1965, and 
the assistance of Dr. Paul C. Mangelsdorf, Director of 
[ 286 | 
