460 COMPOSITAE 
heads whitish, several or numerous in a flat-topped or elongate inflorescence, or in depauperate 
plants often solitary, turbinate-cyclindric, with swollen base when fresh; involucre about 10-17 
h. 
A weed in te places, native from eastern United States to tropical America and introduced elsewhere 
in the weed: in our range so far known sats from a — collection from Seattle, digi gach = to be ex- 
pected to spread into western Washington and Oregon. Type locality: North America. Aug.—Sep 
2. Erechtites arguta DC. Cut-leaved Coast Fireweed. Fig. 5802. 
Senecio argutus A. Rich. Fl. N. Zeal. 258. 1832. Not S. argutus H.B.K. 
Erechtites arguta DC. Prod. 6: 296. 1837. 
ual, or in any case or lived, weed up to 2 m. tall, thinly and somewhat deciduously 
aon Lea numerous, well distributed along the stem, u 
i ft 
eral or numerous in an often flat-topped inflorescence, small (the involucre only 5-7 mm. high) 
and aeree: ead cylin dric ; — dull yellow. 
A weed in e places near the coast from Sates County, Oregon, as far south as San Mateo and north- 
a yr Ronite Cotten, Celifernia:; native of Australia and New Zealand. Type locality: New Zealand. 
une—Aug. 
3. Erechtites seme: (A. Rich.) DC. Toothed Coast Fireweed. Fig. 5803. 
Senecio prenanthoides A. Rich. Sert. scotia = 1834. 
Erechtites senuicrer DC, green d. 6: 296 
Similar to E. arguta, averaging oe eae differing most markedly in the sharply, regularly, 
and sata fnety = not at all lobed or pinnatifid, evidently auriculate leaves ; inflorescence 
oo —— and broader 
weed i a dua ng the coast from Lincoln County, Oregon, south at least to Santa Cruz County, 
Catifornint once 3 Sesion “38 and New Zealand. Type locality: New Zealand. July—Sept. 
116. PEUCEPHYLLUM A. Gray, Bot. Mex. Bound. 74. 1859. 
Heads discoid, the flowers all tubular and perfect, yellow, sometimes tinged with purple. 
Involucral bracts equal, uniseriate or subbiseriate, nar e ceptacle flat, 
naked. Corolla-lobes short. Anthers sagittate. Style-branches flattened, externally gland 
lar-papillate, with introrsely marginal stigmatic lines extending o the bluntly 
roun 1 n ensely hairy, obscurely striate ; pa Ss merous 
capillary bristles and intermingled, very slender and elongate, bristle-like scales. Shrubs 
with alternate, narrow, glandular-punctate leaves and numer ich are indi- 
vidually solitary at the ends of the numerous leafy branches. [Name from the Greek peuce, 
the ak and cera leaf, from some likeness in the foliage. ] 
1. Peucephyllum schottii A. Gray. Desert-fir or Pigmy-cedar. Fig. 5804. 
— eee po Bot. Mex. Bound. eo 1859. 
A. Gray, Proc. Amer. Acad. 9: 
Inyonia dysodioides M. E. Boe8 Contr. West Bot. i 8: 42, "1898, 
Much-branched shrub up to 1.5 or 2 m. tall; young twigs finely planddars: sercaty up- 
wards. Leaves numerous, subterete, 0.5-3 cm. lo ong, 1 mm. wide or less, sometim of them 
with a few lateral teeth or short segm ments ; heads subsessile or barely peduneulate at the ends of 
the branches, slightly if at all surpassing the u upper leaves, the disk commonly wide 
ee ont involucral bracts commonly about 13, 7-9 mm. long, the upper parts "Sten rvanietate ike 
t 
In desert canyons and aan aang Lower Sonoran Zone; Mojave and yak reg oa of southern California 
north to the Panamint — n Inyo Socnty. south to wer Ca ae and east to southern Nevada, 
western Arizona. and Sonora. Type locality: Colorado River in Sonora, Mexic Fe ; a 
117. TETRADYMIA DC. Prod. 6: 440. 1837. 
s discoid, cylindric, yellow, 4-9-flowered. Involucre of 4-6 erect equal bracts. 
Re sacle small, naked. Coro lla-lobes longer than the throat. Anther strongly paeitete, 
almost caudate Styl e-branches varying from as in Luina to nearly as in Senecio. Achene 
terete, obscu scurely 5-nerved, glabrous to densely long-hairy ; pappus of numerous white or 
whitish, capillary bristles. More or less canescent, branchin ng, low orieyy with Frsnag 
and often fascicled, narrow, entire , frequently spinose | Nam e Greek 
tetra, four, and dymos, together, referr ring to the tetramerous ‘heads of ee species. | 
genus — be western North America which consists of the following 6 species plus 2 additional ones 
which occur to the east of our range. Type species, Tetradymia canescens DC. 
Achenes a Slebrove ox. py pubescest with hairs that are much shorter than the conspicuous pappus; heads borne in 
