EXPLANATION OF THE ILLUSTRATION 
Pirate XXVIII. a-d, Inca invoLtucrata Cowan. 
a, habit, one half natural size. b, calyx, one and 
one half times natural size. c, outer bract of in- 
florescence, one and one half times natural size. 
d, inner bract, one and one half times natural size. 
e-f, INGA LonGIFOLIOLA Cowan. e, habit, one half 
natural size. f, one flower, one and one half times 
natural size. 
Drawn by Ricuarp S$. Cowan 
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