216 INDEX TO AMERICAN BOTANICAL LITERATURE 
Quehl, L. Mamillaria cornuta Hildm. Monatsschr. Kakteenk. 27: 
126,127... Awd 1917. 
Quehl, L. Mamiullaria Painteri Rose spec. nov. Monatsschr. 
Kakteenk. 27: 22. F 1917.  [Illust.] 
A Mexican species. 
Rehfous, L. De l’action de conditions extrémes sur la structure du 
stomate du “Zea Mays.’ Bull. Soc. Bot. Genéve II. 12: 110-121. 
J. T=10. “31 Ja igat. . 
Rehfous, L. Recherches experimentales sur la morphogénése des 
stomates. Bull. Soc. Bot. Genéve II. 12: 93-109. f. 1-24. 31 Ja 
921 
Studied Zea Mays L. 
Reinking, O. A. Higher Bemis arocees from the Philippines and their 
hosts. IV. Philipp. Jour. Sci. 17: 363-374. O 1920. 
Riddell, W. R. The pharmacopoeia of another botanical physician. 
Trans. Bot. Soc. Edinburgh 28: 1-23. 1920. 
Discussion of ‘The Vegetable Physician’ by Samuel B. Emmons, Boston, 1836. 
Riede, W. Untersuchungen iiber Wasserpflanzen. Flora 114: 1-118. 
1920. 
Among plants studied is Elodea densa from South America. - 
Rolfe, R. A. Odontoglossum Humeanum. Bot. Mag. pl. 8873. 1920. 
Of South Mexico. 
Romell, L.-G. Physionomistique et écologie raisonnée. Svensk. Bot. 
Tidsks. 14: 136-146. 1920. 
Rosen, H.R. The behavior of telia of Puccinia graminis in the south. 
Mycologia 13: 111-113. 26 Mr 1921. 
Rowley, S. M. The cottonwoods of the dunes. Nat. Stud. Rev. 17: 
53-55. F 1921. [Illust.] 
Rudolph, B. A., & Franklin, H. J. Studies of cranberries during 
storage. Fungi studies. Massachusetts Agr. Exp. Sta. Bull. 198: 
$892. f. 2, 2. ; S 1920. 
St. John, H. A freak sweet clover. Rhodora 23: 25, 26. 8 Mr 1921. 
St. John, H. Sable Island, with a catalogue of its vascular plants. 
Proc. Boston Soc. Nat. Hist. 36: 1-104. pl. r, 2. 1921. 
Includes Rubus arcuans Fernald & St. John, sp. nov., and 7 new varieties in 
various gene: 
Salisbury, T., The ienifcawce of the calcicolous habit. Jour. 
_ Ecol. 8: 202-215. 9 F 1921 
Schaffner, J. H. Influence of environment on sexual expression in 
hemp. Bot. Gaz. 71: 197-219. pl. rr +f. 1. 17 Mr'1g21. 
