ParT 3, 1916] CARDUACEAE: ANTHEMIDEAE 259 
of the inflorescence often simple; heads heterogamous, 5—12, in an interrupted raceme, scattered 
below, crowded at the apex; involucre hemispheric or broader, 4 mm. high, 6-7 mm. broad; 
bracts about 20, in 3 series, densely villous. with gray backs and blackish scarious margins, 
ovate or broadly lanceolate, acute; ray-flowers 10-15; coroilas nearly 2 mm. long; disk-flowers 
20-25; corollas 2.5 mm. long; achenes 1.5 mm. long, striate. 
Type LocaLity: Rocky Mountains, Colorado [probably on the headwaters of Clear Creek]. 
DISTRIBUTION: Rocky Mountains, from Montana to New Mexico and Utah. 
26. Artemisia Pattersonii A. Gray, Syn. Fl. N. Am. ed. 2. 
12-453: 1886: 
Artemisia scopulorum monocephala A. Gray, Proc. Acad. Phila. 1863: 66. 1863. 
Arlemisia monocephala A. Heller, Muhlenbergia 1: 118. 1905. 
A perennial herb, with a simple or cespitose rootstock; stem 1—1.5 dm. high, silky-canescent, 
simple; basal leaves 2-4 cm. long, silky-canescent, pinnately divided into 3-5 linear-oblance- 
olate, approximate divisions; stem-leaves 3-cleft or entire; heads solitary, or 2-4 in a dense 
congested spike, heterogamous; involucre broadly hemispheric, 4-5 mm. high, 7-12 mm. broad; 
bracts 20-30, lanceolate, ovate, or oblong, acute or obtuse, in about 3 series, villous, with 
greenish or gray backs and dark-brown or black scarious margins; ray-flowers 10 or less; 
corollas about 3 mm. long; disk-flowers 40-60; corollas dark-brown, 3 mm. long. 
TYPE LocaLity: Rocky Mountains, Colorado [probably on the headwaters of Clear Creek]. 
DISTRIBUTION: Colorado. 
Subgenus C. ABROTANUM 
Heads heterogamous. Marginal flowers pistillate; corollas subcylindric, 2—4-toothed, 
tapering upwards. Disk-flowers hermaphrodite, fertile; corolla deeply campanulate to funnel- 
form, 5-toothed. Style in both 2-cleft and exserted, with filiform spreading branches or in the 
disk-flowers often included or less exserted and with truncate penicillate tips. Receptacle 
glabrous. 
VY. Annuae. Annual or biennial herbs, with bipinnatifid green leaves and numerous small 
heads. Ray-corollas subcylindric, tapering upwards, indistinctly 2-toothed, sparingly glandu- 
lar-granuliferous; style slightly exserted. Disk-corollas campanulate, 5-toothed, glandular- 
granuliferous; style included. 
27. Artemisia biennis Willd. Phytogr. 11. 1794. 
Artemisia annua 8B Lam. Encyc. 1: 266. 1783. 
Artemisia hispanica Jacq. Ic. Pl. Rar. 1: 17. 1786. Not A. hispanica Lam. 1783. 
Artemisia Jacquini Raeusch. Nom. ed. 3. 237, hyponym. 1797. 
Artemisia australis Ehrh.; DC. Prodr. 6: 120, assynonym. 1837. 
A glabrous biennial or annual; stem strict, very leafy, 3-10 dm. high, often tinged with 
purple; leaves 5-15 cm. long, bipinnately divided into oblong or lanceolate, cleft or laciniate 
divisions; heads numerous in small axillary clustered spikes confluent at the top of the stem; 
involucre hemispheric, 2-3 mm. high, 2-4 mm. broad; bracts about 8, subequal, in 2 series, 
elliptic, obtuse, striate, scarious-margined; ray-flowers 10-15; corollas ‘1 mm. long; disk- 
flowers 10-15; corollas yellow, 1 mm. long; achenes 1 mm. long. 
TyPE LocaLity: “New Zealand.” 
DIsTRIBUTION: Nova Scotia to New Jersey, California, and British Columbia; also Kamtchatka. 
ILLUSTRATIONS: Jacq. Ic. Pl. Rar. pl. 172; Britt. & Brown, Ill. Fl. f. 4008; ed. 2. f. 4581. 
28. Artemisia annua L. Sp. Pl. 847. 1753. 
A tall glabrous annual; stem branched, 3-10 dm. high, striate; leaves 2-7 cm. long, pin- 
nately or bipinnately divided into lance-oblong laciniate divisions; heads numerous in small 
racemes ending the numerous branches, nodding; involucre hemispheric, 1.5 mm. high, 1.5- 
2.5 mm. broad; bracts about 8, in 2 series, glabrous, the outer oblong, the inner elliptic, with 
green backs and scarious margins; ray-flowers 5 or 6; corollas greenish-yellow, less than 1 mm. 
long; disk-flowers 5 or 6; corollas yellow, 1 mm. long; achenes 1 mm. long. 
