ENGELMANN — ADD. TO CACTUS-FLORA OF U. S. 201 



diameter, pale yellow; ovary 8-0 1. 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. 



11. OrrxriA pulcheixa, spec. nov. : parvula, diffusa ; arti- 

 culis obovato-clavatis leviter tuberculatis ; folds mimitis e 

 basi ovata subulatis; areolis confertis, superioribus aculeos 

 albidos rectos, singulum longiorem complanatum porrectum 

 sen deflexum, eaeteros brevissimos radiantes gerentibus ; 

 floris purpurei ovario areolis 18-15 albo-villosissimis et acule- 

 oligei'is dense stipato ; sepalis inferioribus lineari-oblongis 

 breviter cuspidatis, superioribus cuneato-spatulatis ; petalis 8 

 obovatis obtusis ; stylo cylindrico exserto, stigmatibus 5 line- 

 aribus suberectis. 



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-li inches long; leaves scarcely 

 1 line long; flower bright purplish red or deep rose red, 

 l\-\h 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- 

 ther Additions and Corrections to my former publications: 



Many Eumamillarice (Syn. Cact., p. 4) have an "ovarium 

 exsertum /" not only the large flowered Longimammce, which 

 approach closely to Corypantha, deviate in this respect Irom 

 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 ovary. 



Mamillaria barbata, Eng. This species is easily propa- 

 gated by seed, and is apt to flower already in the second year. 

 The first flowers in spring (May) appear in the axils of the 

 last, innermost tubercles of the last year, and are, therefore, 

 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 

 0. coccioneltifera ; from a very narrow and short base it is suddenly di- 

 lated 5 or 6 times its diameter, and then gradually contracts upwards. 



