Deppe var. chichuahuana (Engelm.) Shaw (to 

 central Arizona; also Gila and Tonto National 

 Forests) 



Apache pine, Pinus engelmannii Carr. 



Schotts yucca, Yucca schottii Engelm. 



Bonpland willow, Salix bonplandiana H.B.K. 

 to Trans-Pecos Texas) 



yewleaf willow, Salix taxifolia H.B.K. (also 

 to Trans-Pecos Texas) 



netleaf oak, Quercus rugosa Nee (Q. reticu- 

 lata Humb. & Bonpl.) 



Mexican blue oak, Quercus oblongifolia Torr. 



Toumey oak, Quercus toumeyi Sarg. 



silver oak, Quercus hypoleucoides A. Camus 



Torrey vauquelinia, Vauquelinia californica 

 (Torr.) Sarg. 



kidneywood, Eysenhardtia polystachya (Or- 

 tega) Sarg. 



southwestern coralbean, Erythrina flabelli- 

 formis Kearney 



Arizona madrone, Arbutus arizonica (A. 

 Gray) Sarg. 



Chihuahua ash, Fraxinus papulosa Lingelsh. 



ALASKA 



Alaska has no native tree species proposed 

 as endangered or threatened. Most of the coastal 

 spruce — hemlock forests of southeastern and 

 southern Alaska — are within the State's 3 Na- 

 tional Forests. Proposals for additional National 

 Forests in the interior, where additional tree 

 species occur, have been submitted to Congress. 



The rare tree species of the 49th State have 

 been noted and mapped in other publications 

 (Viereck and Little 1972, p. 10-11; 1975). 

 Not one of the 32 native tree species or 

 6 shrub species rarely reaching tree size is con- 

 fined to Alaska or endemic. One tree variety 

 restricted to Alaska and accepted by some au- 

 thors as a species is Kenai birch, Betula papyri- 

 fera var. kenaica (W. H. Evans) Henry (B. 

 kenaica W. H. Evans.) Its range is partly within 

 Chugach National Forest. 



A few tree species rare and local near their 

 northwestern limits within the National Forests 

 of southeastern Alaska are mentioned because 

 of the great geographic separation from the 

 lower 48 States. Perhaps small groves merit 

 special protection within designated natural 

 areas. 



Hooker willow, Salix hookeriana Barratt, in 



Alaska is confined mostly to the Yakutat Bay 

 region within the North Tongass and Chugach 

 National Forests. For many years it was re- 

 garded as a local or endemic species Yukatat 

 willow, S. amplifolia Cov. The nearest trees of 

 the same species are about 500 miles southeast 

 in Queen Charlotte Islands. The main distribu- 

 tion is southward along the Pacific Coast from 

 southwestern British Columbia to northwestern 

 California. 



Two conifers are rare at their northern limit 

 in extreme southeast Alaska within South Ton- 

 gass National Forest : Pacific yew, Taxus brevi- 

 folia Nutt., and Pacific silver fir, Abies amabilis 

 (Dougl.) Forbes. The Rocky Mountain or inland 

 variety of lodgepole pine, Pinus contorta var. 

 latifolia Engelm., reaches Alaska only in the 

 vicinity of Skagway and Haines near the north- 

 ern end of southeast Alaska within North Ton- 

 gass National Forest. Subalpine fir, Abies lasio- 

 carpa (Hook.) Nutt., and western paper birch, 

 B etula papyri f era var. commutata (Reg.) Fern., 

 enter southeast Alaska only near the northern 

 end within North Tongass National Forest and 

 near the southern end within South Tongass 

 National Forest. 



CARIBBEAN NATIONAL FOREST, PUERTO RICO 



The largest number or rare tree species any- 

 where in the National Forest System is found 

 within the Caribbean National Forest in north- 

 eastern Puerto Rico. These tropical trees out- 

 side continental United States were not in- 

 cluded in the first preliminary list of the Smith- 

 sonian Institution (1975). However, a separate 

 list for Puerto Rico is in preparation. 



Incidentally, Hawaii has no National Forests 



and is omitted from this report. The 50th State 

 has more endemic tree species than any other 

 (more than 360 have been named). They are 

 mainly local and scattered over several islands. 

 The Caribbean National Forest (known also 

 as the Luquillo Experimental Forest) contains 

 almost half of the Luquillo Mountains, includ- 

 ing the highest peaks, and totals 28,000 acres. 

 Within it is the Bano de Oro Research Natural 



