Mat, 1920] TAXONOMY, VASC. PLANTS 205 



1828. Hitchcock, A. S. A peculiar species of Lasiacis. .lour. Washington [D. ( '.j Acad. 

 Sci. 9:35-38. 1919. — The genus Lur.'uu ■/.-,-, belonging to the tribe Paniceae, includes L3 species 

 of grasses of tropical and semi-tropical America. All specimens from Trinidad, the I' i t 

 Orinoco, and eastern Brazil, studied by the author, were found to possess a second .sterile 

 lemma in addition to the usual sterile lemma characteristic of the tribe. In the possession 

 of this character, the plants of this region differ from all other known specimens representing 

 the genus, though in other respects they resemble Lasiacis rvscif alia (HBK.) Bitchc. & Chase 

 {Panicum compactum Swartz) to which they were formerly referred. On the basis, there- 

 fore, of distinct geographical range and uniformity in the possession of a second sterile lemn 

 they are raised to specific rank under the name Lasiacis anomala. — Helen .1/ . < HI Ley. 



1529. Holmberg, Otto. Glyceria aquatica — en nomenculturefraga. [Glyceria aquatica. 

 A question of nomenclature.] Bot. Notiser 1919:95-98. 1919. — According to the author, 

 the plant usually known as Glyceria aquatica (L.) Wahl. 1820 (not G. aquatica (L.) Presl) 

 should be known as Glyceria maxima (Hartm.) Holmberg, n. comb., and the one usually 

 known as Catabrosa aquatica, if included in Glyceria, should become Glyceria dulcis (Salisb.) 

 Holmberg. — P. A. Rydberg. 



1530. Lam, H. J. The Verbenaceae of the Malayan Archipelago, together with those from 

 the Malayan Peninsula, the Philippines, the Bismarck Archipelago, and the Palau, Marianne, 

 and Caroline Islands. 8 vo. 370 p., 3 pi. M. de Waal: Groningen, 1919. — A monographic 

 treatment of the family for the area covered with descriptions, keys to the genera and species, 

 and citation of specimens. Twenty-eight genera are recognized, of which Viticipremna and 

 Xerocarpa are proposed as new. Numerous new species are described in the following genera: 

 Guensia (1), Callicarpa (1), Xerocarpa (1); Premna (12), Vitex (2), Gmelina (3), Faraday a 

 (2) and Clerodendron (4). New names and new combinations appear in various genera. — 

 E. D. Merrill. 



1831. Lindstrom, A. A. Om slagtet Rosa. Bot. Notiser 1919: 149-151. 1919.— The 

 author suggests a double set of characters to be used artificially in determining the species of 

 Rosa. First, whether the base of the leaflets is broad, i.e. rounded, truncate, or cordate, or 

 narrow, i.e. cuneate or tapering. Secondly, whether the teeth are directed forward and 

 usually incurved, or salient. By combining the two sets of characters, four types of leaflets 

 are recognized, which he denotes by the Greek letters a, /S, y, and f.— P. A. Rydberg. 



1832. Morvillez, F. L'appareil conducteur des feuilles des Saxifragacees. [The con- 

 ducting organs of the leaves of the Saxifragaceae.] Compt. Rend. Acad. Sci. Paris 167: 555- 

 558. 1 fig. 1919.— See Bot. Absts. 2, Entry 71. 



1833. Piper, C. V. New Pacific Coast plants. Proc. Biol. Soc. Washington [D. C] 32: 

 41-44. 1919. — The following plants found in western United States are described as new 

 species: Sidalcea Nelsoniana, Cryptantha suffruticosa, Stachys caurina, Stachys confertifiora, 

 Pentdemon deserticola, Cirsium oreganum, Stachys ciliala macrantha is described as a new 

 subspecies from British Columbia. — J. C. Gilman. 



1834. Pleijel, Carl. Valeriana excelsa Poir. X officinalis L. nova hybrida. [Swedish 

 with diagnosis in Latin.] Bot. Notiser 1918: 295-296. Fig. 1-3. 1918.— P. A. Rydberg. 



1835. Rowlee, W. W. Synopsis of the genus Ochroma, with descriptions of new species. 

 Jour. Washington [D. C] Acad. Sci. 9: 157-167. 1919.— The wood of Ochroma. commonly 

 called "balsa wood," has become widely known during the past few years through its utiliza- 

 tion for war purposes. Its light weight has fitted it for use in life-boats, life-rafts, and aero- 

 planes. The results of seven months' study in Central America where the author was sent 

 to investigate the quality and quantity of balsa wood, are set forth in this paper. Nine 

 species are described, 7 new species added to the 2 previously known. Balsa is a conspicu- 

 ous tree of tropical America, sometimes occurring as isolated individuals in forests but more 

 often as abundant second growth in clearings. It is one of the most rapid-growing trees 

 known. — Helen M. Gilkey. 



