INDEX TO AMERICAN BOTANICAL LITERATURE Tis 
Boyce, J. S. A study of decay in Douglas fir in the Pacific 
northwest. U. S. Dept. Agr. Dept. Bull. 1163: 1-19. 
pl. FS. 2 jl i623. 
Brackett, A. Revision of the American species of Hypoxis. 
Rhodora 25: 120-147. f. 1-13. 28 Au 1923. 
Includes five new species. | 
Brandegee, T. S. A note on Penstemon Stephensi. Bull. 
Torrey Club 50: 215. 6 Jl 1923. 
Britton, N. L. An unrecorded weed in Bermuda. Torreya 
23: 67, 68. 
Norta erysimoides (Desf.) Britton, comb. nov. 
Brownell, L. W. The pin oak. Nat. Mag. 2: 112-114. Au 
1923. [TIllust.] 
Brownell, L. W. The white oak. Nat. Mag. 2: 27-29. Jl 
1923. [Illust.] 
Burkholder, W. H. The gamma strain of Colletotrichum 
Lindemuthianum (Sacc. et Magn.) B. et C. Phyto- 
pathology 13: 316-323. 28 Jl 1923. 
Cammerloher, H. Zur Biologie der Bliite von Aristolochia 
grandiflora Swartz. Oesterr. Bot. Zeitschr. 72: 180-198. 
pl. 5-7. Au 1923. 
Chambers, R. & Sands, H.C. A dissection of the chromosomes 
in the pollen mother cells of Tradescantia virginica L. 
Jour. Gen. Physiol. 5: 815-820. pl. r. 20 Jl 192 
Clements, F. E. The ecological method in teaching botany. 
New Phytol. 22: 98-104. 31 Jl 1923. 
Cockerell, T. D. A. White-flowered Primula angustifolia. 
Torreya 23: 68. Au 1923. 
Coffman, F. A. & Quisenberry, K. S. A multiflorous variation 
in Burt oats. Jour. Hered. 14: 185-192. f. 17-21. 31 
Jl 1923. 
Coker, W. C. & Couch, J. N. A new species of Thraustotheca. 
Jour. E. Mitchell Sci. Soc. 39: 112-116. pl. 8. Au 1923. 
Thraustotheca achlyoides sp. nov., from North Carolina. 
