12 Botanisches CentralblaH. 



EiddeJsdell, H. J. 1913. Notes on Helosciadum. (Proc. Cotteswold Field 



Club. XVIII. p. 231 242.) 

 RiddelsdeU, H. J. 1917. Rubus in Gloucestershire. (Proc. Cotteswold 



Nat Field Club. XIX. p. 213- 227.) 

 Robbins, W. W. 1918. Successions of Vegetation in Boulder Park, 



Colorado. (Bot. Gaz. LXV. p. 493—525. 14 f.) 

 Rock, J, F. 1918. Cyrtandreae hawaiienses, sect. CrotonocalycesHillebr, 



{Amer. Journ. Bot. V. p. 259—277. 6 pl.) 

 Rogers, R. S. 19!8. Chilo^lottis Pescottiana, sp. nov. (Proc. r. Soc. 



Victoria. N. S, XXX. p. ^139-141. 1 pl.) 

 Ronniger, K. 1918 Aus der Pflanzenwelt Korsikas. (Verh. zool.-bot. 



Ges. Wien. LXVIII. p. (210)— (236) der Sitzber.) 

 Rusby, H. H. 1918. Recent botanical collecting in the republic of 



Columbia. (Mem. Torrey bot. Club. XVII. p. 39-47.) 

 Safford, W. E. 1918. Chenopodium Nuttalliae [n. sp.l.a food plant of 



the Aztecs. (Journ. Washington Ac. Sc. VIII. p. 521-527. 3 f.) 

 Sargent, C. S. 1918. Notes on North American trees. I. Quercus. (Bot. 



Gaz. LXV. p 423—459.) 

 Saxton, W. T. and L. J. Sedgwick. 1918. Plants of nothern Gujarat. 



(Rec. bot. Surv. India. VI. p. 209 - 323. 1 m.) 

 Schlechter, R. 1918, Angraecura X Wolterianum Schltr. (Orchis. XIL 



p. 60-62. 1 F) 

 Schlechter, R. 1918. Orchidaceae novae, in caldariis Horti Dahlemen- 



sis cultae (Nbl Berlin-Dahlem. VII. p. 268- 280.) 

 Schonland, S. 1918. A summary of the distribution of the genera of 



South African Flowering plants. (Trans, r. Soc S. africa. VII. p. 



19-58.) 

 Schröter, C. 1918. Ueber die Flora des Nationalparkgebietes im Unteren- 



gadin. Mit Anhang: Les formes topographiques du Parc national 



suisse, par E. Chaix. (Jahrb. Schweiz. Alpencl. 1918. 50 pp. 7 T. 



u. Fn.) 

 Scully, R. W. 1918. Reappearance of Lathyrus maritimus in Kerry. 



(Irish Nat. XXVII. p. 113 — 115.) 

 Silveira, A. A. da 1918. Contribui^^äo para as Eriocaulaceas brasilei- 



ras. (Arch. Jard. bot. Rio de Janeiro. II. p. 7—8. 2 pl.) 

 Standley, P. C. 1918. Omiltemia, a new genus of Rubiaceae from 



Mexico (Journ. Washington Ac. Sc. VIII. p. 426—427.) 

 Taylor, Norman 1918. A qu^antitative study of Raunkiaer's growth- 



forms as illustrated by the 400 commonest species of Long Island, 



N.Y. (Mem. Brooklyn bot Gard. I. p 486-491.) 

 Taylor, Norman 1917. Flora of the vicinity of New-York. (Scientific 



Monthly. 1917. p. 548—553). 

 Tehon, L. R. 1918. Svstematic relationship of Clithris. (Bot. Gaz. 



LXV. p. 552-5.55. 1 pl.) 

 Theriot, I. 1917. A propos du Braunia diaphana (C. M.) Jaeg. et du 



Leucodon sekistos Welw. et Daby. (Bull. Soc. bot. Geneve. IX, p. 



135-136.) 

 Trelease, W. 1918. The ancient oaks of America. (Mem. Brooklyn bot. 



Gard. I. p. 492-501. 10 pl.) 

 Trelease, W. 1918. Winter botany. (Urbana, Illinois. Publ. by the 



author. 1918. XL, 394 pp. 330 f. Price | 2.50.) 

 Vierhapper, F. 1918. Zur Kritik und Klärung einiger pflanzengeographi- 

 scher Begriff'e und Bezeichnungen. (Verh. zool.-bot. Ges Wien.. 



LXVIII. p'. (196)-(209) der Sitzber.) 

 Vischer, W. 1917. Deux phanerogames critiques de la flore suisse. 



(Bull. Soc. bot. Geneve. IX. p. 132.) 



