emphasized by the foregoing list of field collections. Since 
many of the botanists who have worked in northeastern 
Oaxaca (a poorly mapped region) neglected to supply 
sufficient information concerning localities, it is some- 
times difficult, if not impossible, to determine the precise 
localities where collections were made, unless one is per- 
sonally acquainted with the region. As exact localities 
are of extreme importance, especially in the study of en- 
demics, I have cited all of the known field collections of 
Rhodochiton volubile and have added complete geograph- 
ical data. 
We do not know exactly where in Mexico Baron 
Karwinski collected the seeds from which the type of 
Rhodochiton volubile was grown. In his description, Zuc- 
carini stated merely that the plant ‘‘crescit in imperio 
mexicano,” 
Karwinski spent five years in Mexico. Although most 
of this time was devoted to botanical exploration in Oax- 
aca, little is known concerning the precise localities which 
he visited. No comprehensive itinerary of his trip is 
available. However, two of Karwinski’s localities, which 
Zuccarini cited incidentally, are of interest. In a footnote 
to an article (8) on the Cactaceae collected in Mexico by 
Karwinski, Zucearini stated that Karwinski had worked 
‘*bei San Pedro Nolasco”’ and ‘‘bei Yavesia in der Prov. 
Oaxaca.’’ Both of these localities are very near the places 
where the Hartweg, Galeotti, and Schultes collections 
were made. San Pedro Nolasco is a mountain near the 
boundary between the Districts of Ixtlan and Villa Alta, 
while Santa Maria Yavesia (long. 96° 25’, lat. 17° 14’) is 
a small Indian village in the easternmost part of the 
District of Ixtlan. 
Inasmuch as Rhodochiton volubile appears to be en- 
demic to northeastern Oaxaca and since Karwinski is 
known to have explored the very forests where this spe- 
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