ENGELMANN—ADD. TO CACTUS-FLORA OF U. S. 201 
diameter, pale yellow; ovary 8-9. L long, with 13-15 areola?, 
-densely covered with white wool, the upper ones with a few 
white spines ; lower sepals broadly oval, with a short cusp ; 
petals 5 obovate, roundish, crenulate; style longer than sta¬ 
mens; stigmas 5, short, cuspidate, erect. 
'^^H. Opuntia pulchella, spec, nav.: parvula, diffusa; arti- 
culis obovato-cjavatis leviter tuberculatis; foliis minutis e 
basi ovata subulatis; areolis confertis, superioribus aculeos 
albidos rectos, singulum longiorem complanatum porrectum 
seu^ deflexum, caeteros brevissimos radiantes gerentibus; 
floris purpurei ovario areolis 13—15 albo-villosissimis et acule- 
oligeris dense stipato; sepalis inferioribus lineari-oblongis 
hreviter cuspidatis, superioribus cuneato-spatulatis; petalis 8 
obovatis obtusis; stylo cylindrico exserto, stigmatibus 5 line- . 
aribus subereetis. 
Sandy deserts on Walker River, Nevada; fl. in June. 
This is one of the smallest and prettiest species of the'genus 
and belongs to the section Clavatce (Syn. Cact., p. 46); 
it is readily distinguished from its allies by the small joints 
and purple flowers. Joints 1—1^ inches long; leaves scarcely 
1 line dong; flower bright purplish red or deep rose red, 
l\-lh inches in diameter; ovary 4-5 1. long, beset with white 
bristly spines, 15-25 on each areola; style not ventricose in 
the' lower half, as is usual in this genus ;* stigmas slender, 
pale yellow. 
From other sources I am enabled to give the following fur- s % 
>ther Additions and Corrections to my former publications: • 
Many Eumamillarim (Syn. Cact., p. 4) have an “ ovarium 
exsertum /’ not only the large flowered Zo7igimammce , which 
approach closely to Corypantha, deviate in this respect from } 
the assumed character of the subgenus, but in a great many 
other species I find the same peculiarity; so that I am in¬ 
clined to restrict the ovarium immersum to that natural sub¬ 
division, the Lactescentes , already recognized by Zuccarini; 
probably all those with limpid juice have an exsert ovarv. . 
Mamillaria barbata, Eng. This species is easily propa¬ 
gated by seed, and is apt to flower already in the second 
The first flowers in spring (May) appear in the axils o 
last, innermost tubercles of the last year, and are, th_ 
almost central; the later ones seem to be developed from the 
axils of the first tubercles of the same spring ! Flowers 9—10 
1. long, of the same diameter ; tube constricted above the ex¬ 
sert oval ovary; 12-13 exterior green sepals, lanceolate, cus¬ 
pidate, fimbriate, 8 interior ones, reddish, longer, lance-linear, 
* Another deviation from the usual form I observe in the style of 
O. coccionellifera; from a very narrow and short base it is suddenly di¬ 
lated 5 or 6 times its diameter, and then gradually contracts upwards. 
liy propa- 
cond year. I ^ J ^ 
ils of the I 
therefore, j Jp 
1 from the I 
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• . . Botanical 
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