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In all references to the fruit of this species it is described as 〃oval and
green；〃 except in Ives Report； where Dr。 Engelmann describes its real
character as the ordinary fruit of Eumamillaria。The immature fruit is 〃oval
and green；〃 but with maturity it becomes clavate and scarlet。The Utah
specimens of Parry show an exceptional character in their 30 to 33
scabrous radial spines； but otherwise they are quite normal。M。 microcarpa
Engelm。； Emory's Rep。 156。 f。 3； should be dropped as a synonym of this
species； at least as to figure and description。 In all probability C。grahami is
one of the forms of the Mexican C。 schelhasii （Pfeiff。）。Except that in C。
grahami the radial spines are apt to be more numerous and longer； and the
centrals much darker； and in C。 schelhasii the 3 centrals seem to be always
present and sometimes all hooked； the descriptions suggest no
difference。In the absence of authentic specimens of the latter species；
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North American Species of Cactus
however； and with its fruit and seed entirely unknown； such a reference of
C。 grahami must be deferred。
20。 Cactus bocasanus （Poselger）。
Mamillaria bocasanaPoselger； Gart。 Zeit。 94 （1853）。
Depressed…globose； 2 to 3 cm。 high： tubercles 8 mm。 long； with long
axillary wool： radial spines 25 to 30； white and capillary； 10 to 25 mm。
long； central spines 2 to 4； slender and naked （or slightly puberulent）； the
most central one hooked （usually upwards）； 15 to 25 mm。 long； the upper
1 to 3 shorter and straight； all yellow with red tips； the hooked one often
brownish…red nearly to the base： flowers unknown： fruit green； about 4
mm。 long： seeds cinnamon…brown； oblique； broadly obovate； with
narrowly ovate basal hilum。Type unknown。
San Luis Potosi； so far as known。Poselger says； 〃Texas； auf der Seira
de Bocas； among rocks；〃 which station we have been unable to locate。
Specimens examined： San Luis Potosi （Eschanzier of 1891）： also
specimens cultivated in Hort。 Pfersdorff in 1869； in Mo。 Bot。 Gard。 in
1891； also growing in Mo。 Bot。 Gard。 1893。
The capillary radials give the plant a white…woolly appearance。The
younger spines at the vertex are erect and tufted。It resembles C。 grahami；
but the tubercles are much more slender and not thickened at base； all the
spines are more slender； the central hooked one is more reddish； and the
fruit is much shorter。
21。 Cactus eschanzieri； sp。 nov。
Depressed…globose； 3 cm。 in diameter； simple： tubercles broader at
base； 6 to 8 mm。 long； with naked axils： spines all pubescent； radials 15 to
20； with dusky tips； the lateral 10 to 12 mm。 long； the lower weaker；
shorter and curved； the upper shorter； solitary central spine reddish；
slender； somewhat twisted； usually hooked upwards； 15 to 25 mm。 long：
flowers red （？）： fruit reddish （？）； ovate； about 10 mm； long： seeds reddish；
oblique…obovate； 1。2 mm。 long； pitted； with subventral hilum。Type in Herb。
Coulter。
San Luis Potosi。
Specimens examined： San Luis Potosi （Eschanzier of 1891）。
Resembles C。 grahami； but with fewer and more slender pubescent
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North American Species of Cactus
spines； longer and less rigid central； more exserted fruit； and much larger
reddish and strongly pitted seeds with subventral hilum。
22。 Cactus tetrancistrus （Engelm。）。
Mamillaria tetrancistraEngelm。 Am。 Jour。 Sci。 II。 xiv。 337 （1852）； in
part。Mamillaria phellospermaEngelm。 Syn。 Cact。 262 （1856）。Cactus
pellospermusKuntze； Rev。 Gen。 Pl。 261 （1891）。
Ovate or ovate…cylindrical； 5 to 25 cm。 high； 3。5 to 7。5 cm。 in diameter；
simple or rarely branching at base： tubercles ovate…cylindrical； 8 to 14 mm。
long； with axillary bristle…bearing wool； at length naked： radial spines 30
to 60； in two series； the exterior bristle…like； shorter and white； the interior
stouter； longer and dusky…tipped or purplish； central spines 3 or 4； stouter；
longer； brown or blackish from a paler base； the upper 2 or 3 （10 to 14 mm。
long） straight； or one or two or even all hooked； the lower stouter and
longer （12 to 18 mm。）； hooked upwards： flowers about 2。5 cm。 long： fruit
1 to 2。5 cm。 long： seeds large （1。2 to 1。5 mm。 in diameter）； globose and
wrinkled； partly immersed in a brown spongy or corky cup…shaped 3…lobed
appendage。 （Ill。 Cact。 Mex。 Bound。 t。 7）Type； Parry of 1850； but modified
by Le Conte 14 and Bigelow of 1854； all in Herb。 Mo。 Bot。 Gard。
Gravelly soil and sandy stream…banks； from the eastern slopes of the
mountains of southern California； throughout western Arizona and
southern Nevada to southern Utah； referred also to 〃N。 W。 Mexico〃 by
Hemsley （Biol。 Centr。…Amer。）。
Specimens examined： California （Parry of 1850； Newberry of 1858；
Parish of 1882）： Arizona （Le Conte 14； Bigelow of 1854； Dr。 Loew of
1875： also Palmer of 1870； but with no locality。
In the original description this species was confounded with C。
grahami； with which it grows and which it much resembles； and this；
together with the fact that 4 central hooked spines are seldom found；
induced Dr。 Engelmann （Syn。 Cact。 262） to propose the more appropriate
but untenable name M。 phellosperma。The resemblance to C。 grahami is
not so close as general appearance would indicate； as the more oblong or
cylindrical form； longer and less crowded tubercles； more numerous
spines； often more than one hooked central； large seeds； and remarkable
seed appendages serve well to distinguish it。
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North American Species of Cactus
＋＋ Plants with fasciculate slender cylindrical stems （30 to 45cm。 high；
and 2。5 to 6 cm。 in diameter）： Lower Californian。
23。 Cactus roseanus （Brandegee）。
Mamillaria longihamataEngelm。 Mss。Mamillaria roseanaBrandegee；
Zoe； ii。 19 （1891）。
Fasciculately branched at base； the stems 30 to 45 cm。 long
（sometimes pendent from rocks and as much as 200 cm。 long） and 2。5 to 5
cm。 in diamete