CONTRIBUTIONS, NATIONAL HERBARIUM 37 



Volume 26 



Systematic plant studies: mainly tropical America. Pp. i-xii (title, advertisement, 

 title page, dates of publication, errata, preface, contents, and illustrations) ; pp. 

 1-530 (parts 1-10) ; pp. 531-554 (index) ; 39 figs., 40 pis. 1927-1939. 



Pan 



1. The Lecythidaceae of Central America. By H. Pittier. Pp. 1-14, 12 pis. 



May 2, 1927. 



2. The Piperaceae of Panama. By William Trelease. Pp. 15-50. May 21, 1927. 



3. Costa Rican mosses collected by Paul C. Standley in 1924-1926. By Edwin B. 



Bartrara. Pp. 51-114, 39 figs. Oct. 31, 1928. 



4. The Piperaceae of Costa Rica. By William Trelease. Pp. 115-226. Dec. 31, 1929. 



5. Notes on certain type specimens of American Asteraceae in European herbaria. 



By S. F. Blake. Pp. 227-263. Mar. 10, 1930. 



6. Asiatic Pteridophyta collected by Joseph F. Rock, 1920-1924. By Carl Christen- 



sen. Pp. 265-337, 17 pis. Apr. 2, 1931. 



7. The Mexican and Central American species of Viburnum. By C. V. Morton. 



Pp. 339-366. Nov. 16, 1933. 



8. New species of Pilea from the Andes. By Ellsworth P. Killip. Pp. 367-394. 



Jan. 30, 1936. 



9. A revision of Besleria. By C. V. Morton. Pp. 395-474. May 9, 1939. 



10. The Andean species of Pilea. By Ellsworth P. Killip. Pp. 475-530, 11 pis. 



June 14, 1939. 



Volume 27 



Flora of the Panama Canal Zone. By Paul C. Standley. Pp. i-x, 1-416, 7 figs., 67 pU. 

 Jan. 31, 1928. 



Volume 28 



Systematic plant studies. Pp. i-xii (title, advertisement, title page, dates of publica- 

 tion, errata, preface, contents, and illustrations) ; pp. 1-675 (parts 1-4) ; pp. 

 677-694 (index) ; 144 figs., $27 pis. 1929-1941. 



Part 



1. The North American species of Paspalum. By Agnes Chase. Pp. 1-310, 142 figs. 



June 28, 1929. 



2. The American species of Thibaudieae. By Albert C. Smith. Pp. 311-547, 1 fig., 



19 pis. June 27, 1932. 



3. Marine algae of the Smithsonian-Hartford Expedition to the West Indies, 1937. 



By William Randolph Taylor. Pp. 549-561, 1 pi. June 12, 1940. 



4. Plants collected by R. C. Ching in southern Mongolia and Kansu Province, 



China. By Egbert H. Walker. Pp. 563-675, 1 fig., 7 pis. July 22, 1941. 



Volume 29 



[Volume in progress.] 

 Part 



1. Taxonomic studies of tropical American plants. By C. V. Morton. Pp. 1-86. 



Mar. 23, 1944. 



2. Mexican phanerogams described by M. E. Jones. By C. V. Morton. Pp. 87-116. 



May 21, 1945. 

 Asteraceae described from Mexico and the southwestern United States by M. E. 

 Jones, 1908-1935. By S. F. Blake. Pp. 117-137. May 21, 1945. 



3. The American species of Ilymenophyllum, section Sphaerocionium. By C. V. 



Morton. (In press.) 



Volume 30 



[Volume in progress.] 

 Part 



1. A botanical bibliography of the islands of the Pacific. By Elmer D. Merrill. 

 (In press.) 

 A subject index to Elmer D. Merrill's "A Botanical Bibliography of the Islands 

 of the Pacific." By Egbert H. Walker. (In press.) 



