Se ee 
132 
Along both sides of the Lower Rio Grande, 
Specimens examined: TExAs (Wm. Lloyd of 1890, mouth of the 
Pecos; Mrs. Nickels of 1892, 1893): MEXx1co (specimen collected across 
the Rio Grande, near Laredo, in 1894): also growing in Mo. Bot. Gard., 
1893. 
The extreme specific and varietal forms seem worthy of specific distinction, but 
abundant growing material in Mo. Bot. Gard. showed such complete intergradation 
that a specific line of separation was found to be impossible. The varietal form is 
said to be an important one in the ceremonial rites of the Indians. 
GEOGRAPHICAL DISTRIBUTION, 
These forms are evidently Mexican in origin, and the specimens seen 
are all from the Kio Grande region. They have crossed that river 
below the “Great Bend,” and probably belong to lower-lying, more 
eastern Mexican provinces than do the species of Anhalonium. LL. wil- 
liamsit is reported from southern Mexico, but so little is known of the 
distribution of these plants that their eastern Mexican range is conject- 
ural, 
