Neue Litteratur. 61 



Sargent, C. S. 19^8. Notes on North American trees. III. Tilia. I. (Bot. 

 Gaz. LXVI. p. 421—438.) 



Sargent, F. L. 1918. Our national flower. (Science. N. S. XLVII. 

 p. 611—612.) 



Sehlechter, R. 1918. Die Gattung Restrepia H. B. u. Kth. (Rep. Spec. 

 nov. XV. p. 255—270.) 



Sehlechter, R. 1918. Mitteilungen über einige europäische und medi- 

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Schlechter, R. 1918. Orchidaceae novae et criticae. Dec. LI— LVII. 

 (Rep. Spec. nov. XV. p. 193-217, 305—340.) 



Schneider, C. 1918. Notes on American willows. I. The species related 

 to Salix arctica Fall. (Bot. Gaz. LXVI. p. 117—142.) 



Schneider, C. 1918. Notes on American willows. II. The species re- 

 lated to Salix glauca L. (Bot. Gaz. LXVI. p. 318—353.) 



Schulz, 0. E. 1918. Sisymbrium septulatum DC, eine bisher nicht 

 genügend bekannte Art. (Rep. Spec. nov. p. 369—372.) 



Small, J. K. 1918. Botanical exploration in Florida in 1917. (Journ. 

 New York bot. Gard. XIX. p. 279—330. pl. 219-222.) 



Standley, P. C. 1918. Rubiaies: Rubiaceae (pars). (North Amer. Flora. 

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Standley, P. C. 1918. Six new species of trees and shrubs from 

 Mexico. (Proc. biol. Soc. Washington. XXXI. p. 131-134.) 



Standley, P. C. 1918. The North American species of Genipa. (Journ. 

 Washington Ac. Sc. VIII. p. 639—643.) 



Stevens, 0. E. 1918. Plants of Manhattan and Blue Rapids, Kansas, 

 with dates of flowering. IV. (Amer. Midland Nat. V. p. 201 — 204.) 



St John, H. 1918. Additional woolwaste plants. (Rhodora. XX. p. 20.) 



St John, H. 1918. Spiranthes in Dover, Massachusetts. (Rhodora. XX. 

 p. 111 — 114.) 



Strecker, W. 1918. Erkennen und Bestimmen der Wiesengräser in 

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Strong, M. P. 1918. The plane tree [Platanusl. (Journ. int. Gard. 

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Sudworth, G. B, 1918. Miscellaneous conifers of the Rocky Mountain 

 region. (Bull. U. S. Dep. Agric. 1918. 680.) 



Swingle, W. T. 1918. Merrillia, a new rutaceous genus of the tribe 

 Citreae, from the Malay Peninsula. (Philippine Journ. Sc, C. Bot. 

 XIII. p. 335—343. 2 pl.) 



Tidestrom, T. 1918. Tsuga canadensis (L.) Carr. (Rhodora. XX. 

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Wehsarg, O. 1918. Die Verbreitung und Bekämpfung der Ackerun- 

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Wiegand, K. M. 1918. A new variety [glaucescens] of Ivosteum 

 aurantiacum. (Rhodora. XX. p. 116) 



WIgman Jr., H. J. 1918, Arachnis. (Teysmannia. XXIX p. 633—637. 1 pl.) 



Wigman Jr., H. J. 1918. Schaduw , sier- en laanboomen. (Teysman- 

 nia. XXIX. p. 541—546, 580—591.) 



Wigman Jr., H. J. 1918. Xanthorrhoea (Grasboom). (Teysmannia. 

 XXIX. p. 638—642. 1 pl.) 



Williams, R. 0. 1918. Aquatic plants at St Clair Experiment Station. 

 (Bull. Dep. Agr. Trinidad and Tobago. XVII. p. 147 - 149.) 



Williams, R. 0. 1918. Solanum macranthum. (Bull. Dep. Agr. Trini- 

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