398 COMPOSITAE 
somewhat deciduous in age on stems and upper surfaces of leaves. spac thick, 7-25 cm. long, 
and t mm. 
ers sat pn short terminal ate with 3 triangular lobes; disk-flowers tubu 
sn ith 5 triangular seer —— s about 3 mm. long, tr uncate, 5-angled, aeutiees dotted : 
= a somewhat lobed c 
Humid Transition al basis and San Francisco Counties, California. Type locality: San Fran- 
cisco. nf o° ete by Chamisso. June-Sept 
Closely related to the following species. 
3. Tanacetum douglasii DC. Northern Dune Tansy. Fig. 5682. 
Tanacetum douglasitti DC. Prod. 6: 128. 1837. 
Stout aromatic perennial 2-6 dm. high from a branched creeping rhizome, with stout, erect 
or ssonndie ne. leafy, sometimes reddish stems, thinly and — villous-tomentose to glabrate. 
seve rather thick, 0 cm. long, 2-5 cm. wide, with an expanded clasping base, a tri- 
natifid, more rarely bipinnatifid, ~~ a of the idan not strongly revolute, 3-5 mm. long, 
divided to the a ok the segments n t at all a ds ogg deeply redivided into apes or 
obtuse, mucro e lobes; icc Pek bs bara the simple or branched stems, the 
peduncles of My sete heads 1-2 cm. long; heads 8-18, y flier “flowana the mature heads 10-15 
mm. br: d;p h yllar : ies mm. long, trelate to oblong, ? Files except for the scarious margin and 
tip; ecient pistillate flowers few, 5 mm. long, with a short but distinct, emarginate ray —. 
3 mm. long, the throat ‘eshulsd sages ate; disk- “a gh about 4 mm. long, 5-toothed; achenes 3 o 
4 mm. long, truncate, 5-angled, glandular- dotted; pappus a somewhat lobed crown 
Dunes along ne soem Humid Transition Zone; British Me at: saan south to Humboldt Coranty: California. 
Type locality: wester America. _Collected by ees. Sony 
Some of the. collections from southern Oregon and northern Ca Siiee a have less divided leaves more sug- 
gestive of T. camphoratum than T. douglas sit, but ar : placed — ieccuee of the aS of a definite oaks on 
the pistillate flowers and the lack of copious villous tomentu 
4. Tanacetum canum D. C. Eaton. Gray Tansy. Fig. 5683. 
Tanacetum canum D. C. Eaton, Bot. King ~~ SEN pl. 29, figs. 8-14. 1871. 
BY sulambieies cana Heller, Mchlenbetete teas S 
Subshrub fro: ee root, 1.5-3 = hi gh, markedly branched and woody below with many 
erect leafy stems. tele 12 mm. lon ng, sessile, oblance 7“ 2 gees or cleft above into 3-5 divi- 
sions ; heads E rayless, shore Rediunctell in t site nal red metimes solitary, the flowers 
pale loa invo cgi a 3 agri a 3 mm. high, alia’ wider Heh high; phyliaries ovate, 
canescent, sc ined ; ot 2 ‘owen vlatiaat: disk-flowers about 2 m long, 
subcylindric, "acdslarictied witet the short lobes villous ; achenes Nedkcneous’ eran. 
1.5 mm. long, 10-ribbed ; pappus none. 
Cl ae and talus slopes, Hudsonian and A ic-Alpine Zones; ranges of Harney and Malheur Counties, Ore- 
=. southward through the ran ges of western gh jaan in California pocarring, in the pee Nevada from Mono 
unty to Inyo and Tulare —— and in the Inyo and Panamint Mountains. Type locality: eastern Humboldt 
iewiseiac Nevada. July—Aug 
5. Tanacetum potentilloides A. Gray. Cinquefoil Tansy. Fig. 5684. 
Artemisia potentilloides A. Gray, Proc. Acad. 6: 551. 1865. 
Tanacetum potentilloides A. Gray, op. cit. 9: 204. 1874. 
Sphaeromeria — illoides Heller, Muhlenbergia 1: 7. 1900. 
Vesicarpa potentilloides Rydb. N. Amer. Fl. 34: 242. 1916. 
Si hie very-canescent herbs, the decumbent or —— geunee leafy stems 1-3 dm. long, arising 
from a stout, sometimes branched caudex. Basal lea clustered, 5-9 mm. long, petiolate, the 
lades bi- or ‘tripinnately dissected into narrow lobes, én Gir tel sheila: few, resembling the 
| but less divided, mostly shorter than the tecnueee heads rayles, yello Yee several 
to numerous, short-peduncled, clustered at the ends of the stems and sheiers - involuc mm. 
broad ; phyllaries 3-4 mm. long, ovate to broadly ss hairy excent t for the br oat scarious 
»8 
rgi 
covered. with pilose hairs ; achenes- obovoid, sc Rapier ‘swe elling ‘whee 
moist alkaline meadows, Arid Transition Zone; Wheeler Count y, Oregon, er ‘ie eastern California 
to iene County pre adjacent” Nevada. Type locality: Carson City, Newads June—Aug 
102. MATRICARIA [Tourn.] L. Sp. Pl. 890. 1753. 
Annual or perennial, erect or decumbent herbs, often aromatic. Leaves alternate, bi- or 
tripinnatifid into linear rb Inflorescence corymbiform or the heads solitary on the 
sands of the branches. $ many- -flowered, sometimes radiate, the rays white. oe 
lucre saucer shaped, the phyla in 2 or 3 series, not much imbricated, dry with scari 
margins. Receptacle ed, spheric or long-conical. Marginal Stotlas cistillate, 
with or without white rays. Biiecarnlien yellow or green, perfect and fertile, tubular, 
