262 INDEX TO AMERICAN BOTANICAL LITERATURE 
Weingart, W. Cereus Napoleonis Grah. und Cereus Napoleonis Hort. 
Grus. Monatsschr. Kakteenk. 26: 76-79. My 10916. 
Weingart, W. Extranuptiale Nectarien. Monatsschr. Kakteenk. 26: 
1oI-105. Jl 1916. 
Wernham, H. F. Tropical American Rubiaceae—XIII. Jour Bot. 
58: 105-108. Mr 1920. 
Includes Coupoui brasiliensis sp. nov., from Brazil. 
Wherry, E. T. The soil reactions of the ferns of woods and swamps. 
Am. Fern Jour. 11: 5-16. Mr 1921. 
Whitaker, E.S. Experimental investigations on birch and oak. Bot. 
Gaz. 71: 220-235. pl. 12-15 +f. 1-4. 17 Mr 1921: 
Wiggans, R. G. . Variations in the osmotic concentration of the guard 
cells during the opening and closing of stomata. Am. Jour. Bot. 8: 
0-40. f. 1-7. 9 Mr 1921. 
Studied experimentally Zebrina, Cyclamen, Iresine and Beta. 
Williams, R. S. Mosses of the Canadian Arctic Expedition, 1913-18" 
Rep. Canad. Arct. Exped. 1913-18. 4°: 1-15. f. 1-18. 8 F 1921. 
Includes Barbula Johansenii and Chrysohypnum arcticum, spp. nov. 
Wilson, E.H. Amelanchier. In Sargent, C.S., Plantae Wilsonianae 1: 
195, 196. 30 Ap 1912. 
Wilson, E. H. Boraginaceae. In Sargent, C. S., Plantae Wilsonianae 
3: 363-365. 31 Au 1916. 
Wilson, E. H. Eucommiaceae. In Sargent, C. S., Plantae Wilson- 
ianae I: 433. 15 My 1913. 
Wilson, E. H. Flacourtiaceae. In Sargent, C. S., Plantae Wilson- 
ianae 1: 283-286. 30 Ap 1912. 
Wilson, E. H. Myricaceae. In Sargent, C. S., Plantae Wilsonianae 
3: 189. 31 Au 1916. 
Wilson, E. H. Nyssaceae. In Sargent, C. S., Plantae Wilsonianae 2: 
254-257. 24 Mr 1914. 
Wilson, E. H. Osteomeles. In Sargent, C. S., Plantae Wilsonianae I: 
Wilson, E.H. Plumbaginaceae. In Sargent, C.S., Plantae Wilsonianae 
2: 586. 30 Mr 1916. 
Wilson, E.H. Pyracantha. In Sargent, C. S., Plantae Wilsonianae 1: 
177, 178. 30 Ap 1912. 
J.R. Tear-stain of Citrus fruits. U.S. Dept. Agr. Farmers’ 
Bull. 924: 1-12. pl. 2, 2. 26 Ja 1921. : 
Woodruff, L.L. History of biology. Sci. Mo. 12: 253-281. Mr 1921. 
Youngken, H. W. Studies on the Cassaba and Honey Dew melons. 
Am. Jour. Pharm. 93: 104-115. f. r-r2. F 1921. 
