142 COMPOSITAE 
2. Iva hayesiana A. Gray. San Diego Poverty Weed. Fig. 5208. 
Iva hayesiana A. Gray, Proc. Amer. Acad. 11: 78. 1876. 
Suffrutescent, about 1 m. high, sparsely a pee or Psion igs? oe Haagit saad on the 
leaves, and sess sile-glandular ; branc hes erectish. Lea opposite below, alter ve, obovate 
eol in m 
; s tly s ea 
pedicelled, 3-7 mm. thick; pistillate flowers about 5, the ah up to 20; involucre of about 5 
free, i enes 2 mm. long. 
On brackish alkaline flats, Upper Sonoran Zone; San Diego County, California, south to central Lower Cali- 
fornia; also on Cedros Island. Type locality: Jamul Valley ie vale of San Diego, California. April-Sept. 
3. Iva nevadénsis M. E. Jones. Nevada Poverty Weed. Fig. 5209. 
Iva nevadensis M. E. Jones, Amer. Nat. 17: 973. 1883. 
Chorisiva nevadensis Rydb. N. Amer. Fl. 33:9. 1922. 
Diffusely br. anched, single-stemmed annual from _ taproot, 7-15 cm. high, cinereous with 
mostly incurved hairs and somewhat sess aH ices Leaves alternate, petioled, the blades 
ovate or deltoid in outline, 8-18 mm one! nately hedewstn the ultimate segments rather 
few, obtuse, ag ei the “ani of infloresce ce pees smaller, mostly cuneate and 3-lobed; heads 
—3 r in r ‘etal 
€ 
a phy ae 3, free, ovate, with short, recurved-sprea ing, obtuse, herbaceous tips; 
acular bracts subtending the pistillate flowers broadly cuneate, villous, stg bbe Idiot the 
achenes ; pistillate flowers usually 3, the perfect ati sevens obovoid, planoconvex, 2 mm. long, 
at length crustaceous-muricate on margins a both 
In desert places, Lower Sono n Zone; western Nevada = ane t California from Mono County to the 
Death Valley region, Inyo County. Tyee locality: Hawthorne, Mineral Cone Nevada. June—Oct. 
4. Iva now ltites: Nutt. Marsh-elder. Fig. 5210. 
Iva xanthifolia Nutt. 
Cyclachaena xanthifolia Prench. a ce Hort. Frankf. 4. 1836. 
Coarse annual up to 2 m. high, simple or branched; stem glaucescent, essentially glabrous 
below. cl vie and wiandali ar in the rp sesh i nce. Leaves opposite least below, slender-petioled, 
ades o 4-] g e, abou wid umin nate, 
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d in waste places, Arid oe isthe Zone; Alberta and Sasleatehesthn to Nebraska, and south 
hh chetcei Washington and Idaho to freee aay and pee Sickish. also as an occasional weed east to the Atlantic. 
he locality: Fort Mandan [North Dakota]. Au ug.—Oct 
21. DICORIA Torr. & Gray ex A. Gray in Torr. Bot. Mex. Bound. 86. 1859. 
Coarse, much-branched, weedy, autumn annuals, aromatic; pubescence of the stems. 
s 
the upper surface, hispid hairs eaey port on ae lower epee juvenile leaves linear to 
ed and (in ours) continuing to enlarge ates the seeds have matured. “ei ater 
small, flat, with narrow, scarious, ep aecar ny bracts. Pistillate flowers 1-5, withou 
corollas; staminate corollas about 6-15, regular, funnelform. Stamens obtuse at ey 
free, the filaments united. Style-branches oer: ’ Achenes dorsoventrally ae rsa 
time i i 
nate, or pp re) 
bristles). [Name from the Greek, meaning twice an g. 
A genus of gs a Laney ag a species, natives of southwestern United States and adjacent Mexico. 
Type species, Dicoria . Gra 
Achenes 3.5-4.5 mm. long, the margin one-fourth or sore the width of the body of the achene, the teeth or toothed 
lobes distinct; stems with many pustulate-based, spreading, hispid helet cae — = pubescence. 
. D. ee ens hispidula. 
Achenes 4.5-6 mm. long, the margin one-half to pon ag fiat ae of the achene, ie ‘aaiead or Sidlidek — 
contiguous; stems with appressed pubescence g hispid ~ _ rarely completely abse 
Leaves oval to orbicular; margin one-half or nie aa rn pe the body o: achen: Somes Coteenso ere 
and adjacent Mexi pte 5 gees 
Leaves soon ovate; ceupha about one-third the width of the body of the achene; southern N anes and adja- 
t California. D. clarkiae. 
