INDEX TO AMERICAN BOTANICAL LITERATURE I2I 
Overholts, L. O. Diagnoses of American Porias—II. Bull. 
Torrey Club 50: 245-253. pl. 13, 14. 27 Jl 1923. 
Park, J. B. Selection in broom corn. Jour. Hered. 14: 213- 
219. f. 10-12. 30 Au 1923. 
Pfeiffer, H. Histologische Untersuchungen an den Stammchen 
von Lagenocarpus Dracaenula Pfeiff. und an den Knoll- 
stécken.’ Bot. Archiv 4: 147-153. 1 Au 1923. 
Pilger, R. Plantae Liitzelbergianae brasilienses II. Notizbl. 
t. Gart. u. Mus. Berlin-Dahlem 8: 535, 536. 15 Au 
1923. 
Includes two new species of Celastraceae. 
Pilger, R. Rosaceae—Chrysobalanoideae austro-americanae 
novae vel minus cognitae. Notizbl. Bot. Gart. u. Mus. 
Berlin-Dahlem 8: 537-543. 13 Au 1923. 
Includes new species in Couepia (2), Hirtella (1), and Licania (4). 
Porsch, O. Bliitenstinde als Vogelblumen. Osterr. Bot. 
Zeitschr. 72: 125-149. pl. 1-3. Au 1923. 
Rehder, A. Enumeration of the ligneous plants of northern 
China. Jour. Arnold Arbor. 4: 117-192. I1 S 1923. 
Reinking, O. A. Comparative study of Phytophthora Fabert 
on coconut and cacao in the Philippine Islands. Jour. 
Agr. Research 25: 267-284. pl. 1-12. 11 Au 1923. 
Richardson, C. W. Notes on Fragaria. Jour. Genet. 13: 
147-152. 31 Au 1923. 
Rigg, G. B., Thompson, T. G., & Gilliland, W.L. The influence 
of plants on the air in houses. Am. Jour. Bot. 10: 383- 
386. 28 Jl 1923. 
Riker, A. J. Some relations of the crowngall organism to its 
host tissue. Jour. Agr. Research 25: 119-132. pl. I-5. 
21 Jl 1923. 
Robinson, B. L. Records preliminary to a general treatment 
of the Eupatorieae—III. Contrib. Gray Herb. II 68: 
3-43. 18 Au 1923. or 
ncludes new species in Symphypappus (2), Eupatorium (27), Mikanta 
(5), and Brickellia (1). 
