January, 1920] TAXONOMY, VASC. PLANTS 21 



cium carbonate, 5 grams magnesium carbonate, ! grams potassium nitrate, 2 grams pol 

 siiun chloride, and 2 grams sodium thiosulfatc. Under the o conditions, the author claims 

 stimulation with barium carbonate for cowpeas, oats, and corn. More marked stimulation 

 was noted with the use of strontium carbonate. Mixtures of these carbonate n lilted in- 

 juriously as also did barium sulfate. There is included in t he discussion the influence of these 

 two carbonates on the partial mineral composition of the plants. No reference to previous 

 work are made. L. Kniidson. 



TAXONOMY OF VASCULAR PLANTS 



J. M. Grbbnman, Editor 

 SPERMATOLPIIYTES 



141. Cardot, J. Rosacees nouvelles d' extreme-orient. [New Rosaceae from the ex- 

 treme orient.] Not. Syst. 3:353-355, 371-382. Dec. 30, 1918.— New species and varieties, 

 chiefly from China, are described in Pirns, Eribotrya, Photinia, Raphiolepis, and Pygeum. 

 J. M . Greenman. 



142. Chamberlain, Charles Joseph. The living Cycads. Small 8vo. p. xiv + 172 p. Fig. 

 91. University of Chicago press: Chicago, 1919. — The subject is treated under three main 

 captions, namely, (1) Collecting the material, (2) The Life-history, -Ariel (3) The evolution and 

 phytogeny of the group. The volume is written in popular style and presents a general ac- 

 count of the Cycadaceae as a whole. The author's investigations of this group of plants have 

 continued through a period of more than fifteen years and have involved extended travel and 

 careful field study as well as critical laboratory research. Nine living genera are recognized; 

 and it is estimated that there are about one hundred species. The genera are: Zamia, Micro- 

 cycas, Dioon, and Ceralozamia of the Western Hemisphere, Macrozamia, Bowenia, and Cycas 

 of Australia, Stangeria and Encephalartos of Africa. "A much more extended account, tech- 

 nical in character" is promised by the author in a later publication. — J. M. Greenman. 



143. Christy, Miller. The Height of Carduus (Cnicus) palustris. Jour Bot. 57: 20-21. 

 1919. 



144. Cltjte, W. N. The species conception. Amer. Bot. 25:26. 1919. — The statement 

 that Underwood's type sheet of Selaginella arenicola represents three species of the genus 

 Selaginella is challenged. — W. N. Clule. 



145. Cockerell, T. D. A. Notes on Lycaste. Torreya 19: 10-12. 1919. — Three forms 

 of this orchidaceous genus were brought by Mrs. Cockerell from Guatemala, and studied as 

 they flowered in the greenhouse. The form known horticulturally as Lycaste Skinneri var. 

 alba is published for the first time as a new species (L. alba Cockerell). This is distinguished 

 from the true L. Skinneri Lindl. by the larger lateral lobes of the lip and the longer bract. 

 L. cruenta Lindl. is re-described. — J. C. Nelson. 



146. Gamble, J. S. Notes on the flora of Madras. Bull. Misc. Inf. Kew 1918: 223-22S. 

 1918. — The notes recorded in this article pertain to families treated in the recently published 

 second part of the Flora of Madras and supplement previous notes, prepared by Mr. S. T. 

 Dunn, which appeared in the Kew Bulletin, 1916, page 5S. — </. M. Greenman. 



147. Gamble, J. S. Decades Kewenses. XCI. Bull. Misc. Inf. Kew 1918: 23S-242. 191S. 

 — The following flowering plants from South India are described as new to science: Pygeum 

 sisparense, Eugenia discifera, Jambosa Bourdillonii, J. courtallensis, Syzygium palghatense, 

 S. travancoricum, Meteromyrtus (a new genus of the Myrtaceae), M. wynaadensis (Eugenia 

 trynaadensis Beddome), Osbechia lineolata, O. courtallensis, and 0. Lawsoni. — /. M . Greenman. 



