1#4 F. Huck: Pflanzengeograpbie ausserenropäischer Länder. I92 



531. Robbiiis, W. W. and Doilds, (J. S. Studies in mesa and foot- 

 hill Vegetation. 3. Distribution of conifers on the mesas. (Univ. Colorado 

 Studies, VI, 1908, p. 31—36, 1 fig.) 



.">31 a. Robbiiis, W. W. Studies in mesa and foothill Vegetation. 

 4. Distribution of the deciduous trees and sbrubs on the mesas. (Univ. Colo- 

 rado Studies, VI, 1908, p. 36—49, 2 pl., 10 fig.) 



~>:!2. Honett, C. List of Colorado trees. (Plant World, XL 1908. 

 p. 66— 07.) 



."»33. Cockerell, T. I). A. The Genus Crataegus in Colorado. (Re- 

 printed from University of Colorado Studies, vol. V, No. 1, Boulder, Colo. r 

 Dezember 1907. p. 41 — 45.) 



Verf. gibt eine Übersicht über die bis jetzt beschriebenen Crataegus- 

 Arten von Colorado, wobei er auch der fossil erwiesenen gedenkt. 



5:53a. Cockerell, D. T. A. The alpine flora of Colorado. (Am. Nat. 

 XL, 1906, p. 861—873.) 



533b. Cockerell, T. D. A. The bees of Florissant, Colorado. 

 (Bull. Am. Mus. Nat. Hist, XXII, 1906, p. 419—455.) 



534. Cooper, W. S. Alpine Vegetation in the vicinity of Longs 

 Peak Colorado. (Bot. Gaz., XLV, 1908, p. 319—337, 8 fig.) 



535. Holm, T. Studies in the Gramineae, IX. The Gramineae of 

 the alpine region of the Rocky Mountains in Colorado. (Bot. Gaz.. 

 XLVI, 1908, p. 422—444, fig. A— E, pl. XXX.) 



Ber. im Bot. Centrbl., CX, p. 557—559. 



536. Longyear, B. 0. The evergreen trees of Colorado. (BulL 

 Agr. Expr. Stat. of Colorado Agric. College, CXXX, May 1908, 32 pp., 9 pl.> 



Ber. im Bot. Centrbl., CVI1I, 1908, p. 310. 



Behandelt Arten von Pinus, Picea, Pseudotsuga und Abies. 



537. Osterhont, Geo. E. Colorado Notes. (Muhlenbergia, IV. 1909. 

 p. 69.) M. A. 



Eine neu benannte Art Townsendia und eine neue Varietät von Artemisia 

 spiciformis atis Colorado. 



538. Parisl), S. B. Notes on the Flora of Palm Springs. (Muhlen- 

 bergia, III, 1907, p. 121—128.) N. A. 



Schilderungen aus der Colorado wüste. 



539. Ramaley, F. Studies in mesa and foothill Vegetation, 2.. 

 Climatology of the mesas near Boulder, Col. (Univ. Colorado Studies, VI, 

 1908, p. 19—31, 4 fig.) 



539a. Ramaley, F. The botanical opportunity in Colorado. (Univ. 

 Colorado Studies, VI, 1908, p. 5—10.) 



539b. Ramaley, F. Plantzones in the Rocky Mountains of 

 Colorado. (Science, II, XXVI, 1907, p. 642— 643.) 



539c. Ramaley, F. Botany- Account of collections made. (Univ. 

 Colo. Stud., IV, 1907, p. 161 — 165.) 



539d. Ramaley, F. The silva of Colorado, I. Trees of the pine 

 family in Colorado. (Univ. Colo. Stud., IV, 1907, p. 109—122.) 



IL The poplars, aspens and cottonwoods. (Univ. Colo. 

 Stud., IV, 1907, p. 187—197, f. 1—6.) 



539e. Ramaley, F. New Colorado species of Crataegus. (Bot. Gaz.,. 

 XLVI, 1908, p. 38 1—384, 2 fig.) 



