PIPER FLORA OP THE STATE OP WASHINGTON. 431 



HYDROCOTYLE. 



1. Hydrocotyle ranunculoides L. f. Suppl. 177. 1781. 



Type locality: "Mexico." 



Range: Eastern Pennsylvania to Florida, thence westward to Texas, California, and 

 Washington. 



Specimens examined: Seattle, Piper 639; Tacoma, Flett 225; O'Briens, King County^ 

 Pi'per. 



Zonal distribution: Humid Transition. 



CORNACEAE. Dogwood Family. 



Flowers perfect in cymes, either loose or head-like Cornus. 



Flowers dioecious, in spikes Garrya. 



CORNUS. 



Flowers in loose cymes, not involucrate; fruit white or blue. 



Cyme branches hairy; leaves loosely pubescent beneath 1. C. occidentalism 



Cyme branches glabrous; leaves appressed-pubescent beneath 2. C. stolonifera. 



Flowers in head-like cymes, surrounded by a conspicuous involucre; fruit 

 red. 



Tree, 10 to 20 m. high ; bracts 4 to 8 cm. long 3. C. nuttallii. 



Herbaceous, 8 to 20 cm. high; bracts 1 to 2 cm. long 4. C. canadensis.. 



1. Cornus occidentalis (Torr. & Gr.) Coville, Contr. Nat. Herb. 4: 117. 1893. 

 Cornus pubescens Nutt. Sylva. 3: 54. 1849. 



Cornus sericea f occidentalis Torr. & Gr. Fl. 1 : 652. 1840. 



Type locality: "N. W. coast, Douglas, Mr. Tolmie! Dr. Scouler!" 



Range: British Columbia to north California, east to Idaho. 



Specimens examined: Montesano, Heller 3857; Whidby Island, Gardner 139; Seattle, 

 Piper 262, July 10, 1895, July 4, 1897; Silverton, Bouck 91; Cascade Mountains, latitude 

 49°, Lj/aZHn 1859; Spokane, Piper 2692 ; Clarks Springs, ^reaj/er 50, 571; Clallam County, 

 Elmer 2699; Valley, Beattie <& Chapman 2156. 



Zonal distribution: Transition. 



Cornus drummondii Meyer, as recorded in Cooper's Report,is doubtless the above 

 species. 



2. Cornus stolomfera Michx. Fl. 1:92. 1803. Red osier. 

 Type locality: "Hab. ad ripas amniumque rivorumque Canadae et Novae Angliae." 

 Range: New Brunswick to Alaska, south to Virginia, and in the mountains to Califor- 

 nia and New Mexico. 



Specimens examined: Wenache, Whited 205, 1135; Ellcnsburg, Piper, May 20, 1897; 

 Tampico, Henderson, July 31, 1892; Mabton, Cotton 368; west Klickitat County, SuJcs- 

 dorf; Coulee City, Lake & Hull, August 8, 1892; New London, Lamb 1169; Sprague, 

 Sandberg & Leiberg 151; Spokane, Henderson, June 12, 1892; Lake Chelan, Lake cfc Hull, 

 August 25, 1892; Walla Walla, Mrs. L. P. Anderson; Pullman, Elmer 840; Piper 2648; 

 Wawawai, Piper, June 9, 1894; Lake cfc Hull 440; Blue Mountains, Piper, August 2, 1896; 

 Piper, July 15, 1896; without locality, Vasey in 1889. 



Zonal distribution: Arid Transition and Upper Sonoran. 



Cornus baileyi Coult. & Evans has twice been reported from Washington. In each case 

 the specimens are, in our opinion, really C. stolonifera. 



3. Cornus nuttallii Audubon; Torr. & Gr. Fl. 1: 652. 1840. Dogwood. 

 Type locality: Oregon. 



Range: British Columbia to California, west of the Cascade Mountains, and in north 

 Idaho. 



