similar regions; they principally differ in the following 
particulars. P. pallida has very round blunt bracts, white 
flowers, smaller leaves, and grows very weakly and unwil- 
lingly under ordinary circumstances. P. imbricata has 
pointed bracts, yellowish flowers with a dash of violet, very 
long strong leaves, and grows and flowers most freely. 
Our specimens were communicated by Richard Harrison, 
Esq., in May, 1834. 
