242 NORTH AMERICAN FLORA [VoLUME 34 
5. Sphaeromeria diversifolia (D. C. Eaton) Rydberg. 
Tanacetum diversifolium D. C. Eaton, in S. Wats. Bot. King’s Expl. 180. 1871. 
A low shrub; stem about 3 dm. high, angled, grooved, sparingly pilose or glabrate; leaves 
3-5 em. long, distinctly: punctate, sparingly pilose or glabrous, pinnatifid into linear divisions, 
or some of them linear, entire; heads corymbose; involucre hemispheric, 2.5-3 mm. high, 4-6 
mm. broad; bracts 12-14, in two series, puberulent, yellowish with brownish midrib, elliptic, 
obtuse; ray-flowers 8-10; corollas tubular, 3—4-toothed, 2.5 mm. long, glandular-granuliferous; 
disk-flowers many; corollas 2.5 mm. long, glandular-granuliferous, with a cylindric tube and 
campanulate throat; achenes subcylindric, tapering somewhat at the base, truncate at the 
apex. 
TYPE LOCALITY: Canyon of Cottonwood Creek, Utah. 
DistRisutTIon: Central Utah. 
ILLUSTRATION: S. Wats. Bot. King’s Expl. pl. 19, f. 1-7. 
13. VESICARPA Rydberg, gen. nov. 
Perennial silvery-canescent herbs. Leaves alternate, pinnatifid into linear divisions. 
Heads several, corymbose, apparently discoid. Involucre hemispheric or nearly so; bracts 
few in two subequal series, broad. Receptacle pubescent, convex. Marginal flowers (func- 
tionally ray-flowers) few, pistillate and fertile; corollas cylindric, 4-lobed, glandular-granu- 
liferous. Disk-flowers numerous, hermaphrodite and fertile; corollas campanulate, 5-lobed, 
glandular-granuliferous. Anthers with ovate-lanceolate tips. Style of the ray-flowers short- 
exserted, with short, oblong, obtuse branches; that of the disk-flowers equaling the corolla, 
with short truncate branches. Achenes obovoid, of thin texture, utricular, swelling up and 
becoming gelatinous in water, those of the disk-flowers equally 5-angled, those of the ray- 
flowers 3-angled, the 2 lateral angles wing-margined towards the apex. 
Type species, Artemisia potentilloides A. Gray. 
1. Vesicarpa potentilloides (A. Gray) Rydberg. 
Artemisia potentilloides A. Gray, Proc. Am. Acad. 6: 551. 1865. 
Tanacetum potentilloides A. Gray, Proc. Am. Acad. 9: 204. 1874. 
Sphaeromeria potentilloides A. Heller, Muhlenbergia 1: 7. 1900. 
A perennial herb, with a woody root; stems decumbent or ascending, 1-3 dm. high, more 
or less silky; leaves bi- or tri-pinnatifid, or the upper only pinnatifid, with linear or linear- 
oblanceolate divisions, silvery-sericeous; heads several or many, corymbose-paniculate; in- 
volucre 3-4 mm. high, 6-8 mm. broad; bracts 12-14, obovate, rounded or obtuse at the apex, 
sericeous, light-brown with yellowish margins; ray-flowers few; corollas 2 mm. long; disk- 
corollas 2 mm. long. 
TYPE LocaLity: Near Carson City, Nevada. 
DistTrRiBuTIoNn: California, Oregon, and Nevada. 
14. CHAMARTEMISIA Rydberg, gen. nov. 
Dwarf tufted silvery-canescent perennials, with a short cespitose woody caudex. Leaves 
alternate but mostly clustered at the base, pedately 3—5-divided. Heads apparently discoid, 
solitary, or rarely 2, at the end of the stems. Involucre hemispheric; bracts in 2 nearly equal 
series. Receptacle convex, naked. Marginal flowers (functionally ray-flowers) pistillate and 
fertile, but without ligules; corollas nearly tubular, tapering upwards, 3-toothed. Disk-flowers 
many; corollas straw-colored, tubular-cylindric, glabrous, with 5 pubescent lobes. Anthers with 
subulate tips. Style in the ray-flowers exserted, in the disk-flowers included; branches of 
the former linear, of the latter short and truncate at the apex. Achenes subcylindric, glabrous; 
pappus of 5 subulate squamellae. 
Type, Tanacetum compactum H. M. Hall. 
