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ENGELMANN—ADD* TO CACTUS-FLORA OF U. 
19T 
Additions to the Cactus-Flora of the Territory of the 
United /States. By George Engelmann, M.D. 
Since my Synopsis of the Cactacece of the United States* 
was published, Dr. J. S. Newberry, attached , to Lieut. Ives’ 
Expedition to the ColoradoRiver, 1857-58, has elucidated 
more fully the natural’ history of several species, heretofore 
only imperfectly known.f In the same year, 1858, and the 
following one, my brother, Henry Engelmann, Geologist to the 
Expedition sent under Capt. Jas. H. Simpson, U. S. TopOg. 
Eng., to explore the best emigrant routes through the interior 
of Utah, discovered in that interesting country a number of 
new forms, which were placed in my hands for examination. 
My report on them, illustrated by several plates from the 
hands of our skillful artist, Mr. P. Roetter, was in due time 
sent to the department; but the necessities of the country not 
permitting the official publication, I have received permission 
to communicate the substance of my investigations. 
1. Mamillaria vivipara, Haw. Engel. Syn. Cact ., p. 13. 
In the South Pass, and on Sweetwater River, no specimens 
of this wide-spread species have turned up from the other 
side of the great mountain chain. 
2. Echinooactus Simpsoni, spec. nov. : e basi turbinata 
simplex:, subglobosus seu depressus, mamilliferus; tuberculis 
laxis ovatis oblique truncatis axilla nudis; areolis ovatis seu 
ovato-lanceolatis, nascentibus albo-villbsissimis mox nudatis ; 
aculeis exterioribus sub-20 tenuibus rigidis rectis albidis, in- 
•terioribus 8-10 erecto-patulis robustioribus paulo longioribus 
obscuris ; areola florifera sub tuberculi. apice aculeis contigua 
circulari; floribus in vertice dissitis minoribus; sepalis ovarii 
paucis et tubi btevis inferioribus orbiculatis crenulatis, supe- 
rioribus ovatis obtusis, petalis oblongis cuspidatis e virescente 
■ roseis, stigmatibus 5-7 brevibus in capitulum globosum com- 
pactis; bacca parva sicca umbilico latissimo truncata flore 
marcescente demum deciduo cor on at a ; seminibus paucis 
magnis oblique obovatis minute tuberculatis. 
Yar. p. minor: tota planta, tuberculis, aculeis, seminibus 
minoribus. 
Butte Valley, in the Utah Desert, and Kobe Valley, farther 
west; var. j3. in Colorado Territory, e. g. in coarse gravel or 
in crevices of rocks, abundant near Mount Vernon, at the t>ase y-f 
of the mountains, Parry , Hall & Harbour ; fl. in May, fr. in 
July and August. With the New Mexican E. papyracan- 
- * Proceedings Amer. Acad. Arts &Sciences, Vol. III., p. 259-314; p. 
344-346, Nov. 1856. 
f See my account in Lieut. Ives’ Colorado River Expl. Exped., Wash¬ 
ington, 1861, Botany, p. 12-44. 
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