90 F- Fedde und K. Schuster: Index novarum Siphonogamarum. [QQ 



LopJiocerens australis (K. Brandegee) Britton and Kose 1. c. p. 427 (= Cereus 



Schottii australis K. Brandegee). — Lower California. 

 L. Sargentianus (Orcutt) Britton and ßose 1. c. p. 427 (= Cereus Sargentianus 



Orcutt = Pilocereus Sargentianus Orcutt). — Lower California. 

 L. Schottii (Engelin.) Britton and Rose 1. c. p. 427 (= Cereus ScJiottii Engelm. 



= Pilocereus Schottii Lern. = Cereus Palmeri Engelm.). — Mexico. 

 Melocactus microcarpus Valkenier Suringar 1. p. 3 et 36. — Aruba. 

 M. trigonaster Valkenier Suringar 1. c. p. 4 et 36. — Curacao. 

 M. pyramidalis S. D. var. compressus Valk. Sur. 1. c. p. 4. — ibid. 

 M. cordatus Valk. Sur. 1. c. p. 5 et 37. — Aruba. 

 M. tenuissimus Valk. Sur. 1. c. p. 6 et 37. — Curacao 



M- pinguis V'^alk. Sur. var. areolosiis Valk. Sur. 1. c. p. 7 et 37. — Surinam. 

 M- rotida Sur. var. angusticostatus Valk. Sur. 1. c. p. 8 et 37. — Curacao. 

 M- intermedius Sur. var. rotundatus Valk. Sur. 1. c. p. 9 et 38. — ibid. 

 M. rotula Sur. var. validispimis Valk. Sur. 1. c. p. 10 et 38. — ibid. 

 M. grandis Valk. Sur. 1. c. p. 11 et 38. — ibid. 

 M. grandispinus Valk. Sur. 1. c. p. 12 et 39. — ibid. 

 M. lutescens Valk. Sur. 1. c. p. 13 et 39. — ibid. 

 M. rotifer Sur. var. angustior Valk. Sur. 1. c. p. 14 et 39. — ibid. 

 31- pinguis Valk. Sur. var. planispinus Valk. sur. 1. c. p. 1.") et 37. — ibid. 

 M. gracilis Valk. Sur. I. c. p. IG et 39. — ibid. 



M- jjinguis Valk. Sur. var. laticostatus Valk. sur. 1. c. p. 19 et 37. — ibid. 

 M. cylindricus Valk. Sur. 1. c. p, 19. — ibid. 



M. pinguis Valk. Sur. var. tenuissimus Valk. sur. 1. c. p. 20. et 38. — ibid. 

 Myrtillocactus cochal (Orcutt) ßritton and Rose in Contrib. U. S. National 



Herbarium Washington XII (1909). p. 427 (= Cereus cochal Orcutt = C. 



geometrizans cochal K. Brandegee). — Lower California. 

 21. Schenckii (Purpus) Britton and Rose 1. c. p. 427. PI. LXXIII (= Cereus 



Schenckii Purpus). — Mexico, 

 Nopalea lutea Rose in Contrib. U. S. Nat. Herb. Washington XII (1909). p. 405. 



PI. LVIII. — Guatemala (Kellerman n. 7046). 



Nyctocerens Britton and Rose gen. nov. in Contr. U. S. Nat. Herb. XII (1909). 

 p. 423. 



Erect or straggling, slender, sparinglj branched cacti, with cylin- 

 dric fluted stems and branches, the numerous areoles bearing a tuft of 

 Short white wool and small radiating acicular brictles or weak spines; 

 flowers large, white, nocturnal; ovarj bearing small scales and tufts of 

 weak spines or bristles; coroUa funnelform, the nearly cylindric tube 

 gradually expanded above, bearing scales and tufts of weak bristles 

 below the midde, above the middle bearing distant, narrowly lanceolate 

 scales, which grade into the blunt outer perianth Segments; inner 

 perianth segments widely spreading, obtuse or acutish; stamens nume- 

 rous; shorter than the perianth; style about as long as the stamens; 

 fruit scaly and spiny or bristly. The genus is, perhaps, heterogamous. 



N. serpentinus (Lag. et Rodrig.) Britton and Rose 1. c. p. 423 (^ Cactus serpen- 

 tinus Lag. et Rodrig. = C- amhiguus Bonpl. := Cereus serpentinus DC. = 

 Cereus amhiguus DC. = Echinocereus serpentinus Lern.) — Mexico. 



N. Hirschtianus (Schum.) Britton and Rose 1. c. p. 424 (= Cereus Hirschtianus 

 Schum.). — Nicaragua. 



