18 BULLETIN 1247, U.-S. DEPARTMENT OF AGRICULTURE 
but where there is a very long growing season, as in the Tropics, 
single tubers weighing considerably more than a pound may be 
produced (fig. 12). In Figure 13 is shown a hamper of yautia 
tubers grown in extreme southern Florida in a season in which 
potatoes on adjoining land completely failed because of frost and 
excessive rains. 
Yautias are baked, boiled. fried, and cooked in most of the other 
ways in which potatoes or dasheens are prepared. Slight modifica- 
tions in method are 
often necessitated, 
however, by differ- 
ences in the moisture 
content and texture 
of the flesh. 
IMPORTANT SPECIES. 
Xanthosoma caracu Koch 
and Bouché,*! 
ROLLIZA YAUTIA, S. P. I. 
NO. 14471. 
The Rolliza* yautia 
is understood to oc- 
cur in slightly vary- 
ing forms in several 
countries of north- 
ern South Amer- 
ica and Central 
America, in Mexico, 
and in many islands 
of the West Indies. 
It is one of the best of 
the yautias, having 
cylindrical or club- 
shaped white-fieshed 
tubers of good size. 
The tubers retain 
their whiteness when 
Fic. 12.—An exceptionally large yautia tuber received from cooked and are of ex- 
the Woot ncies, Ue ts BS dches a Tenge 3 eee 
A long growing period is required to produce tubers of cCOrms are not suit- 
Ee ee able for human food, 
but are cut into pieces and used for replanting or may be cooked and 
fed to stock. An entire hill of Rolliza yautias with soil, roots, and 
leaves removed is shown in Plate X, Figure 2. 
The plants have broad, spreading leaves and grow from 4 to 6 
feet in height under favorable conditions. The margins of the basal 
lobes of the leaf often blend with the basal veins for an inch or more 
near their attachment to the petiole, leaving part of the veins exposed 
next to the leaf sinus. The petiole is green with recurved sinus 
“The use of this specific name for the Rolliza yautia is in accord with the usage of A. 
Engler in Das Pflanzenreich, Heft 71, IV, 23E, p. 52, 1920. 
* Pronounced Roll yeé sa. 
