INDEX TO RECENT LITERATURE 569 
Schrenk, H. von. The ‘‘Bluing’’ and the ‘Red Rot’’ of the 
Western Yellow Pine, with Special Reference to the Black Hills Forest 
Reserve. U.S. Dept. Agr. Plant Ind. Bull. 36: 1-40. p/. 7-74. 5 
My 1903. 
Schrenk, H. von. The Brown Rot Disease of the Redwood. U. S. 
Dept. Agr. Forestry Bull. 38: 29-31. A/. 70, 7z. 1903. 
Schrenk, H. von. Diseases of the Hardy Catalpa. U.S. Dept. 
Agr. Forestry Bull. 37: 49-59. Al. 23-370 +f. 1, 2. 1902. 
Schrenk, H. von & Hill, R. Seasoning of Timber. U.S. Dept. Agr. 
Forestry Bull. 41: 1-48. /. 7-18 +f. 1-76. 1903. 
Schrenk, H. von & Spaulding, P. The Bitter Rot of Apples. U.S. 
Dept. Agr. Plant Ind. Bull. 44: 1-54. f/. 7-9. 18 Jl 1903. 
Schulz,0.E. Monographie der Gattung Cardamine. Bot. Jahrb. 32: 
280-416. 24 Ap 1903; 417-623. 30 Je 1903. 
Of the 116 species recognized, about one half are American, of which four are new 
including C. flagellifera from North Carolina, C. innovans from Guatemala, C. Mext- 
cana from Mexico and C. pendulifiora from California and Oregon. 
Schumann, K. Cereus gummosus Eng. Monats. Kakteenk. 13: 104, 
105. 15 Jl 1903.  [Illust.] 
Schumann, K. Cereus Pomanensis Web. Monats. Kakteenk. 13: 
69. 15 My 1903. 
Notes the identity of this species with the more recently described C. Balansaci K. 
Sch. 
Schumann, K. Neue und wenig gekannte Kakteen aus den Anden 
Siid-Amerikas. Monats. Kakteenk. 13: 65-68. 15 My 1903. 
Includes description of Cereus aurivil/us sp. nov. 
Schumann, K. Ueber neuerdings gefundene Gifte in den Kakteen. 
Monats. Kakteenk. 13: gt. 15 Je 1903. 
Schumann, K. Die vegetative Vermehrung der Opuntien. Monats. 
Kakteenk. 13: 84-87. 15 Je 1903. 
Schumann, K. Wachstumsverhiltnisse einiger Kakteen aus Paraguay. 
Monats. Kakteenk. 13: 88, gt. 15 Je 1903. 
Schumann, K. Wittia Amazonica K. Sch. n. gen. et spec. Monats. 
Kakteenk. 13: 117-119. 15 Au 1go3._ [Illust.] 
Scribner, F.L. New or Little Known Grasses. U.S. Dept. Agr. 
Agrost. Circ. 30: 1-8. 8 Mr 1901. 
New species and varieties in /chnanthus, Agrostis, Bouteloua (2), Danthonia (3) 
and Panicularia. 
Scribner, F. L. & Merrill, E.D. A New Species of Poa. U. S. Dept. 
Agr. Agrost. Circ. 35: 4, 5. 18 Je 1901. 
Scribner, F. L. & Merrill, E. D. Notes on Ca/amovilfa. U.S. Dept. 
Agr. Agrost. Circ. 35: 2, 3. 18 Je 1901. 
