A (A) Hulten, Eric. 1968, 1973. Flora of Alaska and 



neighboring territories. Stanford Univ. Supp.: 



Botaniska Notiser 126, 459. 

 A Viereck, L. A., and E. L. Little, Jr. 1972. 



Alaska trees and shrubs. U.S. Dept. Agr. For. 



Serv. Hbk. 410. 

 A Welsh, Stanley L. 1974. Anderson's Flora of 



Alaska and adjacent parts of Canada. Brigham 



Young Univ. 

 H Christensen, Carl. 1925. Revised list of 



Hawaiian pteridophyta. Bishop Mus. Bull. 25. 

 H Wagner, W. H., Jr. 1950. Ferns naturalized 



in Hawaii. Occas. Papers Bishop Mus. 20:95. 

 H St. John, Harold. 1973. List and summary of 



the flowering plants in the Hawaiian Islands. 



Pacific Tropical Bot. Garden Mem. 1. 

 C (E) Britton, N. L., and Percy Wilson. 1923-1930. 



Botany of Porto Rico and the Virgin Islands 



and Supp. New York Acad. Sci. 

 C (') Hitchcock, A. S. 1936. Manual of the grasses 



of the West Indies. U.S. Dept. Agr. Misc. 



Publ. 243. 

 C (@) Liogier, Br. Alain. 1965-1967. Nomenclatural 



changes and additions to Britton and Wilson's 



"Flora of Porto Rico and the Virgin Islands" 



and Further changes and additions to the flora 



of Porto Rico and the Virgin Islands. Rhodora 



67:315; 69:372. 

 C (P) Little, E. L., Jr., and F. H. Wadsworth. 1964. 



Common trees of Puerto Rico and the Virgin 



Islands. U.S. Dept. Agr. Hbk. 249. 

 C Woodbury, R. C, et al. 1971. The flora of 



Desecheo Island. J. Agr. Univ. Puerto Rico 



55:478. 

 C (V) Little, E. L., Jr., et al. 1974. Trees of Puerto 



Rico and the Virgin Islands. U.S. Dept. Agr. 



Hbk. 449. 

 C Fosberg, F. R. 1976. Revisions in the flora of 



St. Croix. Rhodora 78:79. 

 C Woodbury, R. O., and E. L. Little, Jr. 1976. 



Flora of Buck Island National Monument. U.S. 



Dept. Agr. For. Serv. Res. Paper ITF-19. 

 C Woodbury, R. C, et al. 1977. The flora of 



Mona and Monito Islands. Univ. Puerto Rico 



Agr. Exp. Sta. 

 C Little, E. L., Ir., et al. 1976. Flora of Virgin 



Gorda. U.S. Dept. Agr. For. Serv. Res. Paper 



ITF-21. 



Habit 



The status — native (N) or introduced (I) — refers to the 

 region or regions nominally covered by the particular part 

 of the checklist: the United States and Canada, Hawaii, or 

 the Caribbean region. If we do not know the status, an 

 asterisk appears instead of N or I. A blank space appears 

 in the first position of the Habit column, in place of any of 

 those three symbols, for a species of which only varieties 

 other than the type variety have grown spontaneously in the 

 United States. Combinations of codes such as AP, ST, or 

 ZE indicate a variable growth cycle, habit, or special habitat. 



Family Name/ No. 



Family names follow the system used by the United States 

 National Herbarium, Smithsonian Institution, Washington, 

 DC. 



