CACTACE. 
SILVA OF NORTH AMERICA. 55 
United States army, when in command of a military reconnaisance from Fort Leavenworth in 
Missouri to San Diego in California ;! and the first account of this tree was published with a portrait 
in the report of this expedition.2 The Suwarro is now a familiar object to all travelers on the railroads 
of southern Arizona, and is occasionally cultivated in California and under glass in the northern states 
and in Europe? 
1 Humboldt (Essai sur la Nouvelle-Espagne, i. 312) alludes to 
the occurrence of a great cylindrical Cactus which the Spanish mis- 
sionaries found growing in the woods at the foot of the California 
Mountains. This, as Dr. Engelmann suggests, may have been Ce- 
reus giganteus, or it may equally well have been one of the other 
tall-stemmed species. 
2 Ex. Doc. No. 41, 30th Congress, Ist Session, 72. 
3 The seeds collected by Colonel Emory, and afterwards by Dr. 
George Thurber and Dr. C. C. Parry when connected as botanists 
with the United States government expedition which was intrusted 
with establishing the boundary line between this country and 
Mexico, were distributed by Dr. Engelmann among cultivators of 
Cactus-plants, and « number of specimens were raised. These have 
grown slowly, and so far as has been reported none of them have 
yet flowered. In Europe Cereus giganteus flowered for the first 
time in July, 1891, a large specimen which had been obtained from 
an American florist producing « number of flowers in the Royal 
Gardens at Kew in England (W. Watson, Garden and Forest, iv. 
342. — Bot. Mag. exviii. t. 7222). 
