10 NORTH AMERICAN FLORA [VoLUME 33 
2. Cyclachaena pedicellata Rydberg, sp. nov. 
A tall annual; stem 1 m. high or more, glabrous up to the inflorescence; lower leaves 
opposite, the upper ones alternate; petioles of the stem-leaves 8-15 cm. long; blades of the 
lower ones broadly ovate, 1—2 dm. long, dentate; those of the upper rhombic-ovate or rhombic- 
lanceolate, long-acuminate, serrate or incised, scabrous-hirsutulous above, strigulose and only 
slightly paler beneath; heads very numerous, in axillary and terminal panicles. most of them 
on individual peduncles 4-12 mm. long; involucre broadly turbinate, 4 mm. broad; bracts 5, 
obovate, short-acuminate, sparingly hirsute on the back; paleae subtending the pistillate 
flowers broadly cuneate, about equaling the achenes, not hooded; those subtending the stam- 
inate flowers minute or wanting; staminate flowers 8-12; corolla funnelform, 2.5 mm. long; 
pistillate flowers 5; achenes nearly black, 3 mm. long. 
Type collected at Santa Fé, New Mexico, September 1895, Isab2l Mulford 1284 (herb. N. Y. 
Bot. Gard.). 
DISTRIBUTION: New Mexico and western Texas. 
3. Cyclachaena ambrosiaefolia (A. Gray) Benth. & Hook.; 
B.D: Jackson; Ind: Kew: 12673)" 269s: 
Euphrosyne ambrosiaefolia A. Gray, Pl. Wright. 1: 102. 1852. 
Iva ambrosiaefolia A. Gray, Syn. Fl. N. Am. 17: 246. 1884. 
An annual; stem 3-6 dm. high, terete, hispid; leaves alternate; petioles 3-5 cm. 
long; blades ovate in outline, 5—8 cm. long, hispid on both sides, bipinnatifid, but the segments 
confluent, the ultimate ones obovate, toothed; heads numerous, slender-peduncled, in 
branched leafy panicles; involucre hemispheric, about 5 mm. broad; bracts 5, obovate or 
oblanceolate, acute, hispidulous on the back, scarcely scarious-margined; paleae subtending the 
pistillate flowers cuneate-obovate, concave, truncate at the apex; those subtending the stam- 
inate flowers filiform with clavate tips; corolla of the pistillate flowers obsolete or a mere 
vestige; achenes cuneate in outline, somewhat flattened, with acute margins, in age muricate. 
TYPE LOCALITY: Mountains near El Paso, Texas. 
DISTRIBUTION: Texas to Arizona, Zacatecas, and San Luis Potosi. 
4. Cyclachaena lobata Rydberg, sp. nov. 
An annual; stem reddish, sparingly hispid, striate; lower leaves unknown; upper leaves 
mostly pinnately 5-lobed; petioles slightly winged, 5-10 mm. long; blades 1—2 em. long, thin, 
sparingly hispid and granuliferous on both sides; lobes and sinuses rounded, the former entire 
or sparingly crenate; heads numerous, in branched panicles; involucre hemispheric, 4 mm. 
broad; bracts 5, ovate, acute, hispidulous, the hairs with pustulate bases; paleae subtending 
the pistillate flowers broadly obovate, concave, nearly 2 mm. long; those subtending the stam- 
inate flowers narrowly cuneate, erose at the apex; achenes cuneate in outline, somewhat flat- 
tened, tuberculate, 1.5 mm. long, black. 
Type collected at Monterey, Nuevo Leon, August 1911, Bro.G. Arséne 6103 (Bro. Abbon 208) 
(U.S. Nat. Herb. no. 1003085). 
6. EUPHROSYNE DC. Prodr.5: 530. 1836. 
Glabrate perennials, with alternate bipinnate leaves. Heads numerous in terminal and 
axillary panicles, ebracteolate. Involucie rotate; bracts 5-7, distinct. Paleae subtending 
the pistillate flowers cuneate-obovate, concave, membranous; those subtending the staminate 
flowers spatulate. Staminate flowers 10 or more; corolla whitish, funnelform; anthers 
acute at the apex; sterile style short; stigma with a hair-pencil. Pistillate flowers 6-10, 
marginal; corolla rudimentary; style-branches glabrous, subterete, obtuse. Achenes obovate, 
flattened, glandular, with a corky margin. 
Type species, Euphrosyne parthenifolia DC. 
1. Euphrosyne parthenifolia DC. Prodr. 5: 530. 1836. 
Gymnostyles parthenifolia Moc.; DC. Prodr. 5: 530, assynonym. 1836. 
Perennial with a tap-root; stem 3-8 dm. high, glabrous or nearly so, striate, often pur- 
plish, branched; leaves sparingly hispidulous and glandular-granuliferous, dark-green above, 
