260 TAXONOMY, VASC. PLANTS [Bot. Absts., Vol. IV, 



1728. Guerin, Paul. L'Urera Humblotii H. Baillon et ses affinities. [Urea Kumblotii 

 and its affinities.] Compt. Rend. Acad. Sci. Paris 168:517-519. 1919. — Urera Humblotii 

 was described in 1885 by H. Baillon and was rediscovered in quantity by R. Vignier in the 

 eastern part of Madagascar, where it is locally known as "Ampy." A comparison of the re- 

 cent collections with those of Baillon leads to the conclusion that U. Humblotii is merely a 

 vigorous form of U. longifolia Wedd., another species from Madagascar, the two being strictly 

 analagous in floral characters and identical in leaf anatomy. U. Humblotii also possesses 

 in the cortex and occasionally in the pericycle a series of laticiferous tubes similar to U. bac- 

 cifera Gaud., a South American form. This laticiferous system is analagous to that found in 

 the Moraceae and Artocarpaceae, and is generally believed to be lacking in the Urticaceae. — 

 F. B. Warm. 



1729. Hassler, E. Aspicarpa, Gaudichaudia, Camarea, Janusia adjectis nonnullis notulis 

 de Malpighiaceis paraguariensibus. [Aspicarpa, including Guadichaudia, Camarea, and Janusia 

 with additional notes on the Malpighiaceae of Paraguay.] Ann. Conserv. et Jard. Bot. Geneve 

 20:203-214. 30 May, 1918. — A synopsis is given of the species included under Aspicarpa. 

 Several new combinations are made and critical notes are recorded concerning a number of the 

 species enumerated. — J. M. Greenman. 



1730. Henderson, Margaret W. A comparative study of the structure and saprophytism 

 of the Pyrolaceae and Monotropaceae with reference to their derivation from the Ericaceae. 

 Contrib. Univ. Pennsylvania Bot. Lab. 5: 42-109. Fig. 1-10. 1919.— See Bot. Absts. 3, Entry 

 2434. 



1731. Hitchcock, A. S., and Paul C. Standley. Flora of the District of Columbia and 

 vicinity. Contrib. U. S. Nation. Herb. 21: 1-329. PI. 1-42, fig. 1. 1919.— This work, which 

 has been prepared with the assistance of many of the botanists of Washington, replaces Ward's 

 Flora of 1881 and its six supplements. There is a short general account of the region, two keys 

 to families, one chiefly by leaves, the other by floral characters, an annotated list of the 

 species, and a glossary. Keys to the genera and species are given under their appropriate 

 headings; and 1630 species are formally listed in the work, 287 of which are introduced, and 

 108 others, known only as waifs, are incidentally mentioned. The illustrations represent 

 localities of interest about Washington and some of the characteristic flowers of the region. 

 —S. F. Blake. 



1732. Johnston, I. M. Contributions on Southern California botany. Bull. Southern 

 California Acad. Sci. 18: 18-21. 1919. — With notes on various Southern California plants, 

 the author describes the following species and varieties as new to science: Monardella saxi- 

 cola, M. lanceolata Gray var. glandulifera, and Corethrogyne filanginifolia (H. & A.) Nutt. var. 

 pinetorum. — Roxana S. Ferris. 



1733. Knowlton, C. H., and Walter Deane. Reports on the flora of the Boston district, 

 XXX. Rhodora 21: 78-83. 1919— See Bot. Absts. 4, Entry 342. 



1734. Koidzumi, Geniti. Contributiones ad floram Asiae orientalis. Bot. Mag. Tokyo 

 33:110-129. 1919. — Continued from Volume 22, and to be concluded in future numbers. 

 Contains new species and varieties in the following genera. Aconitum 1, Angelica 1, Aster 1, 

 Cirsium 4, Claoxylon 1, Corydalis 1, Disporum 1, Euphorbia 1, Jasminum 1, Lypsimachia 1, 

 Pennisetum 1, Pisonia 1, Platanlhera 1, Polygonatum 4, Pyrus 13, Salix 2, Wichstroemia 1. 

 — L. R. Abrams. 



1735. Koorders, S. H., and Th. Valeton. Atlas der Baumarten von Java im anschluss 

 an die "Bijdragen tot de Kennis der Boomsoorten van Java." [Atlas of Javanese trees, an 

 appendix to "Contributions to our knowledge of the tree of species of Java."] — Vol. 1, PI. 1-200. 

 1913; Vol. 2, PI. 201-400. 1913-14; Vol. 3, PL 401-600. 1914-15; Vol. 4, PI. 601-800, Index 

 and errata, 1916-18. F. P. W. M. Trap, Leiden. — This work, as the title indicates, presents 



