242 COMPOSITAE 
the petiolar base, pinnately divided nearly to the midrib with 3-5 widely spreading, linear, obtuse 
oe these 5-10 mm. long; upper leaves reduced above in length an nd often linear on unbranched 
soscir te the outer flowers regular but larger than the inner, the peduncles 1-6 cm. long; invo- 
lucres 6-7 mm. high; phy aries linear lanc poset F agngeel puberalent with occasional cobwebby 
hairs, thin, the midrib becoming somewhat prominent in age; achenes black, about 5 mm. long, 
thickly beset with shine cherie pint. sirentiog hairs nace s of 10 vestigial paleae. 
Barren dry slopes in heavy clay A Arid Transition Zone; Wheeler and Grant Counties, Oregon. Type 
hoe or shen ee an or 2 the col co ae oo g data, as the species sien te be limited to the John Day 
aen 
11. Chaenactis artemisiaefolia (Harv. & Gray ex A. Gray) A. Gray. 
Artemisia-leaved Chaenactis. Fig. 5397. 
h Harv. & Gray ex A. Gray, Mem. Amer. Acad. II. 4: 98. 1849. 
Cwasunetin ek Aw, tes grlss Acad. 10: 74. 1874. 
Coarse, single-stemmed annual 2.5- 10(20) dm. high, often reddish, leafy below, the leaves 
reduced yo absent in the open cymose-paniculate inflorescence; stems usually mealy-pubescent 
below, glandular-hirsute above. Leaves satiolae: $-15(20) ¢ m. long, ovals mealy-pubescent, the 
flat blade ovate in outline, about two-thirds as wide, bi- Printers finely divided into small, 
oblong or linear iba the petioles Spin or more the length of the blade; heads whitish- or 
pinkish-flowered, hemispheric, on curved, ascending, glandular- sags peduncles : cm. long; 
phyllaries 5-9 mm. oe fiseae doreuniate acute, glandular-hirsute; corollas about 5 mm. long, 
e well-defined tube ee ee vee Rigsiiae satis throat glabrous or nearly so, marginal 
ere. like the pple eas ac long, linear-clavate and somewhat flattened, the 
outer somewhat curved, black and _ieroscopcaly oie glabrous or nearly so; pappus- -paleae 
lacking, "f present np trendaon ntary and so: 
er common on mountain slopes, often on n disturbed areas, Upper Sonoran Zone; coastal 
be: evil Santa Barbara County to ip Diego aig pete paehern Lower California. Type locality: Cali- 
fornia. Collected by Coulter. April—Jul 
12. Chaenactis macrantha D. C. Eaton. Large-flowered Chaenactis. Fig. 5398. 
Chaenactis AELTS C. Eaton, Bot. King Expl. 171. pi. 18. figs. 1-5. 1871. 
Annual, 7-25 cm. high, stems rather stout, ae senegal from the mee and branctene, ine 
PS "thinty floccose-tomentulose, often bec ecoming more or less glabra Leaves 1.54 c 
long, reduced above, pinnatifid to bipinnatifid, the blade ovate in route the se bo base beaaee 
than or at least Sagat the blade; heads on peduncles 1. cm. long, ‘white-flower ed, the flowers 
— at night, — united ‘by day; involucre broadly turbinate, the se tg of unequal 
4 in and idvei iti i nce 
¥ pes ffe t 
the disk; achenes about 6 mm. g, strigos e; psa iand ee ae in 12 agg , the four inner linear- 
oblong, 5. mm. mips the four "Blait outer ones about 1 mm. lon 
On n dese washes, Sonoran and Arid Shanes aid sf! Eon stern Idaho and southeastern 
Oregon Pos siooeda., get Utah, and northwestern Ari and the ateave Desert in San Bernardino County, 
aconcg io a locality: “Pahute Mounta ains, Nye Cor pedo Nevada.”’ Collected by Watson. May-June. 
ince 
Soe Chaenactis xantiana A. Gray. Xantus’ Chaenactis. Fig. 5399. 
Ch ti A. Gray, Proc. Ame cad. 6: ise 1865. 
Chaenactis xrantiana var. rerio A. pcg 
gd i: 5-3. - dm. high, stems rather toes reddish, the leaves branching at or a little 
rather | oadly obtu 
tose tip; corollas age mm. long, nearly tubular, lobes of marginal carallag but little Caer ‘han 
those of the disk ; achenes black, 7-8.5 mm. long, strigose ; pace: pappus-paleae 4, lanceolate, pl 
ing the corollas, outer pappus s-paleae usually 4, about 1.5 mm. long, broad and rounded at the 
Sandy flats and open desert slopes, Upper Son n Zone; pide: and Malheur Po 2 Oregon, ge 
through western Nevada =< adjacent California po pete ic Face Arizona and in the San Joaquin Valley, 
pane ony from eastern uis i and western Merced Counties south to the inner northern ranges ad 
southern California and a western ae Seaast. Trove locality: Fort Tejon, Kern County. April-Jun 
Desert Chaenactis; Xantus’ Pincushion. 
14. Chaenactis tanacetifdlia A. Gray. Inner Coast Range Chaenactis. Fig. 5400. 
Chaenactis Sper ge A. Gray, Proc. Amer. Acad. 6: 545. 1865. 
Ann 6-15 cm. high, stems few to several from and near the base, ascending, often curved, 
little or ot at all branched shows lightly floccose, more densely so at the nodes and below the 
he es basal or near the , tending to remain at flowering, few above, 1-5 cm. long, about 
5-10 mm. ah fleshy, dag to glabrate, the pinnae crowded and often contorted, redivided with 
short, often minute lobes; heads yell ow-flowered, terminating the stems and branches, borne on 
