208 PlantcB Lindheimeriarus. 



obovatis planiusculis ; pulvillis remotis ad margines conferti- 

 oribus griseo-tomentosis setis flavidis aculeisque paucis com- 

 pressis ancipitibus instructis, 1-4 validis saspe incequalibus 

 plus minus deflexis varie divergentibus basi rufis, ceterum 

 stramineis cum adventitio infimo graciliore albido ssepe defi- 

 ciente ; fl. . . . bacca ovata subglobosa late umbilicata pulvil- 

 lis pluribus tomentosis stipata ; seminibus minoribus anguste 

 marginatis. — From El Paso to Chihuahua, indigenous and 

 cultivated, Dr. Wislizenus. No doubt, also, on the Texan 

 side of the Rio del Norte. — Erect, 5-6 feet high. Upper and 

 larger older joints 12 inches long by 9 broad. Areolae 1| — 2 

 inches distant: bristles 2-6 lines long: spines 1 - If inches 

 long, very stout. Fruit 1|-1| inches long, about 1| in diam- 

 eter; umbilicus large, (10-12 lines) flat; pulvilli on the fruit 

 about 5 lines distant. Seeds very numerous, about half as 

 large in O. vulgaris, U-l^ lines in diameter, of an irregular 

 shape. — Near O. Dillenii and O. pohjantha, as Prince Salm 

 informs me. 



<§> 2. Cylindricee. 



O. frutescens, Engehn. in PI. Lindh. I. c. under O. 

 fragilis, from which it widely differs, stands near O. gracilis, 

 Salm. (raised from Mexican seeds), but is sufficiently distinct. 

 (Salm.) Fruit by the abortion of the seeds very often sterile. 

 — I had occasion to observe this species in blossom, and add 

 the description of the flowers : 



Floribus ex ramis anni prions provenientibus ; ovario clavato 

 basi 5-gono sepalis subulatis sub-13 stipato ; sepalis interiori- 

 bus 8 lanceolatis ex viridi sulphureis ; petalis 8 obovato-lan- 

 ceolatis cuspidatis (sulphureis s. subvirescentibus) ; staminibus 

 numerosis (40-50) inaequalibus (externis majoribus) ; stylo 

 exserto ; stigmatibus 5 adpressis albidis. — The flower cannot 

 be distinguished from that of the Opuntice applanata, but it is 

 only 8-10 lines in diameter: ovary 9-12 lines long. 

 Flowers (in St. Louis) July and August. 



O. arborescens, Engdm. in Wish Rep., is recognized by 

 Prince Salm as identical with his O. siellata ; but as no de- 



