586 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
COTULA. 
1. Cotula coronopifolia L. Sp. Pl. 2: 892. 1758. 
Type tocauity: ‘‘ In Aethiopia.” 
Rance: Washinzton to California, introduced from South Africa. 
SPECIMENS EXAMINED: Hoquiam, Lamb 1223; Port Angeles, Piper, September 1, 1895; 
Grant in 1889; Tacoma, Flett 127; Charleston, Piper, July 21, 1895; Southbend, Spillman. 
This plant has been abundant in brackish marshes along the seacoast of Washington for 
twenty years or more, and gives one the impression of being native. 
TANACETUM. 
1. Tanacetum huronense Nutt. Gen. 2: 141. 1818. 
Tanacetum douglasii DC. Prod. 6: 128, 1837. 
Type LocaLiry: ‘‘ Lake Huron near Michilimackinack.”’ 
Rance: Washington and Oregon on the seacoast, the Great Lakes, Maine and New 
Brunswick. 
SPECIMENS EXAMINED: Grays Harbor, Lamb 1217; without locality, Cooper; Ilwaco, 
Piper. 
ZONAL DISTRIBUTION: Humid Transition. 
TANACETUM VULGARE L., the garden tansy, is found occasionally as an escape from 
gardens. 
ARTEMISIA. Sacesprusn. Wormwoon. 
Herbaceous or suffrutescent. 
Disk flowers perfect but sterile; marginal flowers pistillate. 
Leaves linear, mostly entire, glabrous. .....--.-------- 1. A. dracunculordes. 
Leaves pinnately or bipinnately divided into narrow 
lobes. 
Heads very numerous, small, greenish... ..---.--- 2. A. canadensis. 
Heads rather few, large, brownish; alpine ...-...- 3. A. borealis. 
Disk flowers perfect, fertile; marginal flowers pistillate. 
Receptacle pilose. 
Leaves silvery pubescent, the short segments fili- 
form .......--- 2-2-2 ee ecee ee ee eee eee ete 4. A. frigida. 
Leaves not silvery, the segments oblong or oblong- 
linear. ........---------- 2-2-2 eee ee ee eee 17. A. absinthium. 
Receptacle not pilose. 
Leaves green, finely dissected into linear segments. 
Biennial; heads small, in leafy panicles. - --.- 5. A. biennis. 
Perennial; heads few, large. .-.------------- 6. A. longepedunculata. 
Leaves white beneath, not finely dissected. 
Involucre persistently white tomentose. 
Leaves not glandular puncticulate........ 7. A. ludoviciana. 
Leaves puncticulate with scattered gland- 
ular dots ........-.----------+---+--- 8. A. atomifera. 
Involucre green, glabrous or pubescent; not 
toméntose. 
Heads campanulate. 
Leaves pinnately or bipinnately di- 
vided into narrow segments. . -. -- - 10. A. discolor. 
Leaves lanceolate-oblong, entire or 
more or less laciniately cleft. 
Stem about 1 m. high; leaves 
persistently tomentose be- 
neath; involucre green. . ..-- - 9. A. tilesii. 
