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ENGELMANN—ADD. TO CAOTUS-FLORA OF U. 
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^Additions to^the Cactus^ of the 
Since my Synopsis of the Cactacece of the United States * 
was published, Dr. J. S. Newberry, attached to Lieut. Ives’ v 
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 V 
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 
^communicate the substance of my investigations. 
1- Mamillaria yivipara, Haw. Engel. Syn. Cact ., p. 18. \ 
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. 
Echinocactus Simpsoni, spec, nov.: e basi turbinata 
sim plex, subglobosus seu depress us, mamilliferus; tuberculin 
laxis ovatis oblique truncatis axilla nudis; areolis ovatis seu 
ovato-lanceolatis, nascentibus albo-villosissimis 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 brevis 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 truneata flore 
marcescente demum deciduo coronata ; seminibus paucis 
magnis oblique obovatis minute tuberculatis. 
Yar. /?. minor : tota planta, tuberculis, aculeis, seminibus 
minoribus. 
Butte Yalley, in the Utah Desert, and Kobe Yalley, farther 
west; var. j3 . in Colorado Territory, e. g. in coarse gravel or 
in crevices of rocks, abundant near Mount Yernon, at the base 
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, Yol. III., p. 259-314 : p. 
344-346, Nov. 1856. ’ F ” 
f See my account in Lieut. Ives’ Colorado River Expl. Exped., Wash¬ 
ington, 1861, Botany, p. 12-14. a itE 
> (■ a t) . i of . Missouri Botanical Garden 
Engelmann Papers 
Botanical 
cm copyright reserved gard 
