474 Floristik, Geographie, Systematik etc. 



mollissimus, Lupinus pusülus, etc. The author then considers in 

 detail and gives lists of the animals and plants found in tbe Colo- 

 rado River and the Rio Grande drainage areas of the Great 

 Basin division of the Upper Sonoran zone with a reference (pages 

 29—33) to the agricultural importance of this arid region. The Con- 

 trolling plant of the Transition zone is the yellow pine {Pinus sco- 

 pulorum), which is quite generally distributed. The western part of 

 Colorado is-a partially open region with sage-covered slopes and 

 parks, alternating with brushy slopes and ridges of chaparral. The 

 Canadian Zone, as far, as the plants are concerned, is characterised, 

 according to Cary, by the aspen {Populus tremuloides) , lodge pole 

 pine {Pinus murrayana) and Engelmann spruce and associated 

 ground flora of herbaceous species. The upper forest of Engelmann 

 spruce {Picea Engelmanni) and baisam fir {Abies lasiocarpa) marks 

 in general the limits of the Hudsonian zone. 



The only shrubs able to withstand the rigorous climate of the 

 Arctic- Alpine zone are several species of alpine willows, such as, 

 Salix petrophila, S. chlorophylla , and such plants as Silene acaulis, 

 Mevtensia alpina, Trifolium nanum etc. while the Vegetation above 

 (3000 feet) consists of mosses and lichens. Small maps add to the 

 value of the distributional part of the report. Harshberger. 



Chamberlain, C. J., The adult cycad trunk. (Bot. Gaz. LH. 

 p. 81-104. Aug. 1911.) 



The material studied included one species of Ceratosamia, one 

 of Zamia, and two of Dioon. The narrow xylem zone of most cycads 

 is found not to be characteristic of Dioon spinulosum , which shows 

 a zone 10 cm thick in a plant 6 m high. Both species of Dioon 

 show growth rings, which in D. spinulosum correspond to the 

 periods of activity which result in the formation of crowns or zones 

 but which in D. edule do not correspond to such periods. The only 

 bundles formed inside the woody ring are those forming the "cone 

 domes", which were studied in four species. D. spinulosum shows 

 protoxylem consisting of scalariform tracheids, which merge into 

 the tracheids with multiseriate bordered pits, which constitute the 

 bulk of the wood. In the wide rays are scalariform tracheids of 

 peculiar form connecting a leaf trace with the secondary xylem. 



M. A. Chrysler. 



Coekerell, T. D. A., New names in Hex. (Torreya. XI. p. 264. 

 Dec. 1911.) 



Hex Kingiana replacing /. insignis Hook, because of the 

 prior use of this name for a fossil species, and /. microphyllina 

 replacing /. microphylla Nebwerry, applied to a fossil and preoccupied 

 by /. microphylla Hook. Incidentally Salix Eastwoodii is proposed 

 to replace S. fastwoodii Heller (S. californica Bebb.). Trelease. 



Coker, W. C, A Visit to the Yosemite and the Bigtrees. 

 (Journ. Elisha Mitchell Scientific Society. XXV. p. 131 — 143. Dec. 

 1909.) 



In this paper the writer notes the trees, shrubs and herbs ob- 

 served in a trip across the San Joaquin Valley in California, 

 in the chaparral of the Sierra Nevada foothills, in the Yosemite 



