CATALOGUE. I77 
and somewhat corymbose above, hispid with rigid spreading hairs; the 
branchlets, leaves and involucres also sprinkled with stalked blackish glands; 
leaves oblong-linear, about 1' long, obtuse, entire ; heads 1' or more broad; rays 
8-12, white, 3-lobed at the end; pappus very white, awns about 10, as long 
as the achenium and one-half longer than the copious spreading hairs at 
their base.— Plant 4-10' high ; disk-achenia villous with appressed hairs. 
Oregon and California ; Western Nevada, (Bloomer ! Anderson !) Valley of 
Salt Lake, (Stansbury.) Valleys and foot-hills throughout Nevada, and cast- 
ward to the Wahsatch ; 4,200-6,500 feet elevation ; April-July. (G22.) 
Layia HETEROTRiCHA, H. & A. Much Hke the last, but commonly a 
larger plant, 10-15' high ; the pubescence shorter and harsher, the l)lackish 
glands sometimes very few ; leaves larger (1-2' long) and often toothed, 
especially the lower ones; rays yellowish- white, 8-12, broadly wedge-shaped 
and 3-cleft at the apex ; achenium and pappus as in the last. — California. 
Western Nevada to Salt Lake City, 4,500-6,000 feet elevation ; April- 
June. (623.) 
Hemizonia^ Durandi, Gray. Proc. Amer. Acad., 6. 549. A small 
hispid branching annual, 3-6' higli ; leaves mostly opposite, narrowly linear, 
3-6" long, sessile ; heads very small, (li" long,) short-peduncled ; involucre 
globose-pyriform, of 5 glandular-hispid concave and convolute scales, which 
enclose the ray-achcnia ; ligules broadly cuneate, 3-lobed ; disk- flowers 1 or 
2, enclosed in the half-united chaff ; ray-achenia arcuate-gibbous, with a veiy 
shoi't inflexed beak; disk-achenia straight, oblong-clavate, hairy; pai)piis 
none.— California, (Pratten, Eattan !) Washoe County, Nevada, (Stretch.) 
hairs, or ciliate-setigcrous, rarely naked. — Annual or biennial herbs of California, etc., glabrous, or 
mostly hairy or glandular, the opposite or alteru.ate leaves usually pinnately cleft or loln d, the n])per ones 
entire. Heads rather large and showy, the rays white or yellow ; autlicrs darlc-colorcd. The I'tali and 
Nevada species both belong to the section :Mai>.vi;( ir.i.ossA, wliich lias tlic awns of (lie p)i]>pus si tilorin, 
villous- woolly or plumose toward the Itase, with very long and .slender hairs, the receptacle clially only 
between the outermost disk-flowers and the ray. 
'IIEMIZONIA, DC. Heads few— nniny-flowered, radiate; rays 4-20, pistillati^ ; ligule -J-li-Iobed ; 
disk-flowers perfect, usually infertile, the tubular-fuunel-shaped corolla fj-toothed. Juv.ilurial scales in 
one series, cinn^ave aud }>arlly enclosing the ray-achenia. Receptach; flat, more or less chatly, the cliatV 
sometimes united in a cup. IJrauches of rlie styh^ liiu'ar, in the ray glabrous, in the disk wit li ;i veiy 
his])ul subulate appendage. Achenia of the r:iy glabrous, gibbous-iucurved, more or less obcoiuiuessed, 
witiinut pappus ; of the disk commonly abortive, oblong, often with a pappus of short lacciate cliatl'y 
scales.— Low Californian annuals, Avith narrow, usually .'ilternate leaves, and sniall heads of yellow llowi rs. 
The single.species reported from Nevada is of the section Hi-.mizdxkij.a, Gray, /. liay^ l-'.. the ligule 
very small, scarcely longer than the style. Disk-flower single, or at most 2, enclostxl iu a :;-.">-t<.otlied 
cup, formed of the united chaff of the receptacle ; achenia all fertile, tho.se of the ray soiiu.'wliat iiljcoui- 
pressed, incnrved-giblKuis, of the disk straight. 
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