Part 3, 1916] CARDUACEAE: ANTHEMIDEAE 243 
1. Chamartemisia compacta (H. M. Hall) Rydberg. 
Tanace'um compactum H. M. Hall, Muhlenbergia 2: 343. 1916. 
A dwarf perennial; stems 2-5 cm. high, white-silky-villous; leaves 1-2 cm. long, silvery- 
canescent, divided into oblanceolate divisions; involucre about 5 mm. high, 8-10 mm. broad; 
bracts 18-20, in 2 series, silky-villous, white with dark-brown midrib, lance-ovate or elliptic, 
acute; ray-flowers 5—10; corollas 3 mm. long; disk-flowers about 50. 
Type Locatity: Head of Lee Canyon, Charleston Mountains, Nevada. 
DistRisuTIon: Known only from the type locality. 
15. CROSSOSTEPHIUM Less. Linnaea 6: 220. 1831. 
Artemisia § Tanacetum Nutt. Trans. Am. Phil. Soc. II. 7: 399. 1841. 
Shrubs. Leaves alternate, entire or pinnatifid with narrow divisions. Heads small, 
panicled, apparently discoid, the marginal flowers without ligules. Involucre mostly hemi- 
spheric; bracts in 2-3 series, the inner more or less scarious. Receptacle in ours hairy. Mar- 
ginal flowers (functionally ray-flowers) pistillate and fertile; corollas cylindric, 3-4-toothed, 
almost regular; style barely exserted, with obtuse branches. Disk-flowers hermaphrodite and 
fertile; corollas campanulate, 5-toothed; anthers oblong, subulate-tipped, cordate at the base; 
style barely exserted; branches truncate. Achenes truncate at the apex, 3—5-ribbed, with a 
coroniform, dentate or laciniate pappus. 
Type species, Crossostephium artemisioides Less. (based on Artemisia chinensis Vahl, not L.). 
Leaf-segments less than 1 mm. wide, usually revolute. 
Plant almost silvery-white; some of the leaves ternately cleft at the apex; 
leaves or leaf-segments less than 0.5 mm. wide. 1. C. foliosum. 
Plant merely grayish; some of the leaves pinnatifid; leaves or leaf-segments 
0.5-1 mm. wide. 2. C. californicum. 
Leaf-segments 1-3 mm. wide, not revolute; lower leaves irregularly pinnatifid. 3. C. insulare. 
1. Crossostephium foliosum (Nutt.) Rydberg. 
? Artemisia Fisheriana vegetior Besser, Nouv. Mém. Soc. Nat. Mosc. 3: 88. 1834. 
Artemisia foliosa Nutt. Trans. Am. Phii. Soc. II. 7: 397. 1841. 
A shrub 1-2 m. high; branches densely canescent; leaves 2-4 cm. long, densely canescent, 
the upper filiform, less than 0.5 mm. broad, revolute, the lower 3-fid above the middle; heads 
numerous, in leafy raceme-like panicles; involucre hemispheric, about 3 mm. high, 4-5 mm. 
broad; bracts 12-15, the outer ones elliptic, canescent, scarcely scarious-margined, the inner 
ones oval, less pubescent, and with broad scarious margins; ray-flowers 7—10; corollas cylindric, 
somewhat flattened, 3—-4-lobed; disk-flowers 15-20; corollas cylindro-campanulate, 5-toothed, 
1.5 mm. long; achenes 3—-5-ribbed, becoming glutinous in wetting; pappus coroniform. 
Tyre LocaLity: Monterey, California. 
DistrisuTion: California and adjacent islands. 
2. Crossostephium californicum (Less.) Rydberg. 
Artemisia californica Less. Linnaea 6: 523. 1831. 
Artemisia Fischeriana Besser, Nouv. Mém. Soc. Nat. Mosc. 3: 21. 1834. 
Artemisia abrotanoides Nutt. Trans. Am. Phil. Soc. II. 7: 399. 1841. 
A shrub 1-3 m. high; branches grayish-strigose; leaves 2-5 cm. long, fascicled, pinnately 
divided into filiform divisions or the upper entire and filiform, revolute, canescent, fleshy; 
heads numerous, nodding, in dense panicles with racemiform branches; peduncles 1-5 mm. 
long; involucre depressed-hemispheric, 3 em. high, 5-6 mm. broad; bracts 15-20, in about 
3 series, somewhat canescent, the outermost oblong, fleshy, somewhat shorter, the inner 
ones with thick backs and broad scarious margins, obovate or rounded-spatulate; ray- 
flowers 8-10; corollas cylindric, short, regular, 4-toothed, glandular-granuliferous; disk- 
flowers 15-20; corollas campanulate, 5-toothed, 2 mm. long; achenes 3—5-ribbed; pappus den- 
tate. 
Type Locaity: California. 
Distrermurion: Central and southern California, along the coast. 
4 
