454 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
SPECIMENS EXAMINED: Columbia River, latitude 46° to 49°, Lyall in 1860; Egbert Springs, 
Sandberg & Leiberg:379; without locality, Vasey 428; Wenache, Whited 68; Ellensburg, 
Whited 489; North Yakima, Watt, August, 1895; Union Flat, Lake & Hull 555; Waitsburg, 
Horner 404; Almota, Piper 1868; Pullman, Elmer 899; Piper 1625; Mission, Kreager, 
August 20, 1902. 
ZONAL DISTRIBUTION: Upper Sonoran and Arid Transition. 
2. Asciepias mexicana Cav. Ic. 1: 42. 1791. 
Asclepias fascicularis Dec. in DC. Prod. 8: 569, 1844. 
Type Locauity: ‘‘ Habitat prope Mexico.” 
Rance: Washington to California, Arizona, and Mexico. 
SPECIMENS EXAMINED: Tampico, Mlett 1025; Fort Simcoe, Henderson; Spokane, Sand- 
berg, August, 1892; Dewart, July 15, 1901; Wawawai, Piper 2664; Horner 664. 
ZONAL DISTRIBUTION: Upper Sonoran and Arid Transition. 
CONVOLVULACEAE. 
CONVOLVULUS. Morninc-cuory. 
Calyx without bracts; leaves glabrous....................... 3. @. arvensis. 
Calyx inclosed by two large bracts. 
Leaves reniform, fleshy................---------------- 1. @. soldanella. 
Leaves triangular-sagittate, not fleshy........-.-.-.-.--- 2. C. sepium americanus. 
1. Convolvulus soldanella L. Sp. Pl. 1: 159. 1758. 
Type Locauity: “Habitat in Angliae, Frisiae littoribus maris.”’ 
Rance: Washington to California on the seashore. Europe. 
SPECIMENS EXAMINED: Whidby Island, Gardner 219; Copalis, Lamb 1257; Shoalwater 
Bay, Cooper; Ocosta, Henderson in 1892; Ilwaco, Piper 4999. 
ZONAL DISTRIBUTION: Humid Transition. 
2. Convolvulus sepium americanus Sims, Bot. Mag. 19: pl. 732. 1804. 
Type LocaLiry: America. 
Rance: Washington to Canada and Carolina. 
SPECIMENS EXAMINED: Mount Adams, Suksdorf, July 14, 1886; Henderson; Klickitat 
River, Flett 1022; Ophir, Elmer 607; Almota, Piper, August 9, 1896; Wawawai, Piper 
1694. 
ZONAL DISTRIBUTION: Upper Sonoran and Arid Transition. 
3. Convolvulus arvensis L. Sp. Pl. 1: 153. 1753. 
TyPE LOCALITY: Europe. 
SPECIMENS EXAMINED: Ellensburg, Whited 525. A troublesome weed becoming wide- 
spread. It has been noted at Pullman, Walla Walla, Garfield, and Edwall. 
CUSCUTACEAE. 
CUSCUTA. Dopper. 
Stigmas filiform; corolla scales crenulate. 
Calyx lobes not keeled; corolla lobes triangular, acute... 1. C. epithymum. 
Calyx lobes keeled; corolla lobes ovate, obtuse ---.-.-.- 2. C. planiflora. 
Stigmas capitate; corolla scales fringed. 
Capsule pointed. 
Flowers subsessile; dry corolla not enveloping the 
capsule. ........-...-----------------2 eee eee 3. C. squamigera. 
Flowers pedicelled; dry corolla enveloping the cap- 
sule.......-..----------- +222 22 ee eee eee eee 4, C. indecora. 
