STANDLEY TKEES AND SHRUBS OF MEXICO 167/ 



Page 893. After Cephalocereus purpusii add: 



Cephalocereus collinsii Britt. & Rose, Cactaceae 4: 269. 1923. Oaxaca 

 the type from Ger6nimo. ' 



Page 901. After Lemaireocereus dmnortieri add: 



Lemaireocereus beneckei (Ehrenb.) Britt. & Rose, Cactaceae 4: 273 1923 

 Cereus beneckei Ehrenb. Bot. Zeit. 2: 835. 1844; Cereus farinosus Haage in 

 Salm-Dyck, Allg. Gartenzeit. 13: 355. 1845; Piptanthocereus beneckei Riccobono 

 Boll. Ort. Bot. Palermo 8: 226. 1909. Central Mexico. 



Page 916. After Selenicereus spinulosus insert: 



Selenicereus nelsonii (Weingart) Britt. & Rose, Cactaceae 4: 283. 1923. 

 Cereus nelsonii Weingart, Zeitschr. Sukkulent. 1: 33. 1923. Southern Mexico. 



Page 931. Ariocarpus kotschoubeyanus and A. jissuratus (p. 932) should be 

 referred to a distinct genus, as follows: 



ROSEOCACTUS Berger, Journ. Washington Acad. Sci. 15: 45. 1925. 



Roseocactus kotschoubeyanus (Lemaire) Berger, Journ. Washington Acad. 

 Sci. 15: 48. 1925. See page 931 for synonymy. 



Roseocactus fissuratus (Engelm.) Berger, Journ. Washington Acad. Sci. 

 15: 46. 1925. See page 932 for synonymy. 



Roseocactus lloydii (Rose) Berger, Journ. Washington Acad. Sci. 15: 48. 

 1925. Ariocarpus lloydii Rose, Contr. U. S. Nat. Herb. 13: 308. pi. 62. 1911. 

 Considered by Berger a distinct species, known only from Zacatecas. 



After Ariocarpus retusus add: 



Ariocarpus trigonus (Weber) Schum. Gesamtb. Kakt. 606. 1898. Anhalo- 

 nium trigonum Weber, Diet. Hort. Bois 90. 1893. Northern Mexico. Often 

 confused with A. retusus, but characterized by its longer and narrower tubercles. 



Page 932. After Ariocarpus fissuratus insert: 



OBREQONIA Fric, Zivot v Prinode 29^: 3. 1925. 



The genus resembles Strombocactus and Ariocarpus, but seems to be distinct 

 from both. 



Obregonia denegrii Fric, Zivot v Prinode 29^: 3. 1925. Vicinity of Vic- 

 toria, Tamaulipas. 



Page 949. After Ferocactus rostii add: 



Ferocactus johnstonianus Britt. & Rose, Cactaceae 4: 287. 1923. Type 

 from Angel de la Guardia Island, Baja CaHfornia. 



Page 955. After Cactus Salvador add: 



Cactus oaxacensis Britt. & Rose, Cactaceae 4: 289. 1923. Oaxaca. 



Page 961. After Neolloydia conoidea add: 



NeoUoydia stuetzlei (Fric) Britt. & Rose. 



Coryphantha stuetzlei Fric, Zivot v Prinode 29: 65. 1925. 



Solitary (rarely several heads from one root, or proliferous), oblong to clavate, 



5 cm. in diameter, 14 cm. high, rounded at apex, densely long-lanate at top 

 when in flower; tubercles dark green, short and thick, arranged in 8 or 9 spiral 

 rows, the grooves on upper side of tubercles woolly but not glandular; areola 

 at top of tubercle somewhat longer than broad, at first densely woolly; spines 

 usually all radial, 18 to 24, white, often with black tips, spreading or recurved, 



6 to 10 mm. long, a few areoles on old plants producing a central spine, this 

 solitary, erect or ascending, 1 to 1.5 cm. long, black; flowers magenta, 3 cm. 

 long or more; perianth segments oblong, acuminate; filaments short, pale; style 

 and stigma lobes (5) white; fruit not seen. 



Collected by C. R. Orcutt at La Maroma ranch, 10 miles north of Jaumave, 

 Tamaulipas, Mexico, in 1925 (no. 554). Also collected at the same place and 

 time by Robert Runyon (no. 31). 



