218 CONTRIBUTIONS PROM THE NATIONAL, HERBARIUM. 



Specimens examined: Cohasset, Lamh 1122; Ilwaco, Henderson, September 9, 1892; 

 Westport, Heller 394; Henderson, Juno 2^, 1892; Ilwaco, Piper 4952. 

 Zonal distribution: Humid Transition. 



BETULACEAE. Birch Family. 



Fruit a nut inclosed in a leafy involucre Corylus. 



Fruit cone-like, without involucre. 



Cone scales deciduous '. Betula. 



Cone scales persistent Alnus. 



CORYLUS. 



1. Corylus calif ornica (A. DC.) Rose, Gard. & For. 8: 263. 1895. Hazel. 



Corylus rostrata californica A. DC. Prod, l?^: 133. 1864. 



Corylus americana Walt. err. det. Cooper, Pac. R. Rep. 12'^: 68. 18(i0. 



Type locality : Santa Cruz, California. 



Ran<ie: British Columbia to California. 



Spe<'i.mens examined: Montesano, Heller 3971 ; Seattle, Piper 189; west Klickitat County, 

 Suksdorf 1214; Sumas, Lyall; Fort Colville, WaLion; without locality, Vasey in 1889; Box 

 Canyon, Kreager 410; Kettle Falls, Beattie dk Chapman 2191. 



Zonal distribution: Transition. 



BETXJXiA. Birch. 



Branchlets glandular-warty. 



Shrub about 1 meter high; leaves. glabrous \. B. glandulosa. 



Shrub or tree 3 to 6 meters high; leaves sparsely pubescent 3. B. microphylla. 



Branchlets not glandular-warty; tree with gray bark 2. B. occidentalis, 



1. Betula glandulosa Michx. Fl. 2: 180. 1803. 



Type locality: "Circa lacus, a sinu Hudsonis ad Mista-ssins." 



Range: Oregon and Colorado to New England and northward. 



Specimens examined: Cascade Mountains, latitude 49°, Lyall in 1860; Seattle, Piper, 

 May 25, 1891; Tacoma, Fleit 29; Steilacoom, Piper 183; McAllisters Lake, Henderson, June 

 22, 1892; Klickitat County, Suksdorf; Falcon Valley, Suksdorf; Klickitat River, Flett 1344, 



iSoNAL distribution: Canadian? Always found in sphagnum bogs. 



2. Betula occidentalis Hook. Fl. Bor. Am. 2 : 155. 1^39. 

 Betula jriperi Britt. Bull. Torr. Club 31 : 165. 1904. 



Type locality: "Straits of De Fuca." Collected by Scouler. 



Range: British Columbia, Washington, and Idaho. 



Specimens examined: Gulf of Georgia., Henderson in 1888; Everson, Piper, September, 

 1892; Sumas Prairie, Lyall in 1858-59; Cascade Mountains, latitude 49°, Lyall in 1859; 

 Tukanon River, Lake cfc HuU, July 5, 1892; Blue Mountains, Piper, July 15, 1896; ten miles 

 southwest Pullman, Piper 3807. 



Zonal distribution: Transition. 



This is the Betula lutea Michx. ? of Suksdorf 's List. 



A variable tree as it occurs in Washington and perhaps only a subspecies of the eastern 

 B. papyrifera. Typical occidentalis occurs in northwestern Washington, where it is a rather 

 dark-gray barked tree, occasionally 3 feet in diameter. The very similar tree in Stevens 

 County and in the Blue Mountains is somewhat smaller in size and often white-barked. The 

 name Betula piperi was meant by its author to apply to the third unnamed species in the 

 Flora of the Palouse Region, but the specimen actually cited is the eastern Washington form 

 of B. occidentalis Hook. 



