96 NORTH AMERICAN FLORA [VOLUME 33 
Leaves densely gray-tomentose beneath. 14. E. tomentosa. 
Heads 5—8-flowered; achenes glabrous. 
Heads 5—6-flowered; leaf-blades ovate-lanceolate. 15. E. Shannoni. 
Heads 7—8-flowered; leaf-blades broadly ovate. 16. E. littoralis. 
Achenes with 3 prominent ribs on the ventral face only, glabrous or nearly 
so; heads 3—7-flowered. 
Leaf-blades thinly puberulent or tomentulose to nearly glabrous 
beneath. 17. E. Heydeana. 
Leaf-blades densely tomentose beneath. 
Achenes pale-brown; corolla-tube hairy without. 18. E. leiocarpa. 
Achenes dark-purple to black; corolla-tube glabrous without. 19. E. melanocar pa. 
Eremosis triflosculosa (H.B.K.) Gleason, Bull. 
N. Y. Bot. Gard. 4: 233. 1906. 
Vernonia trificsculosa H.B.K. Nov. Gen. & Sp. 4: 40. 1818. 
Gymnanthemum congestum Cass. Dict. Sci. Nat. 20: 110. 1821. 
Vernonia triantha S. Schauer; Nees & Schauer, Linnaea 19: 714. 1847. 
Cacalia triantha Kuntze, Rev. Gen. 970. 1891. 
Cacalia triflosculosa Kuntze, Rev. Gen. 970. 1891. 
Vernonia luxensis Coult. Bot. Gaz. 20: 41. 1895. 
Vernonia dumeta Klatt, Bull. Soc. Bot. Belg. 35: 277. 1896. 
Stems 3m. high, freely branched, thinly pubescent, or glabrate in age; leaf-blades thin, 
oblanceolate to elliptic, 8-12 cm. long, 1.5-3 cm. wide, acute or acuminate, entire or nearly so, 
tapering at the base, bright-green above, essentially glabrous on both sides, paler and glandular- 
punctate beneath; inflorescence large, conic or hemispheric; heads 3-flowered, sessile or nearly 
so in groups of 2-5; involucre cylindric, pale-brown, 4—5 mm. high; scales loosely imbricate, 
the outer subrotund or ovate, subacute, the inner oblong, sharply acute or subacuminate, 
glabrous or nearly so on the back, minutely ciliate; achenes 3 mm. long, pubescent; pappus 
white, 5-6 mm. long, the outer series capillary, irregular in length. 
TYPE LOCALITY: Acahuitzotla, Guerrero. 
DISTRIBUTION: Southern Mexico and Central America. 
2. Eremosis Palmeri (Rose) Gleason, Bull. N. Y. 
Bot. Gard. 4: 233. 1906. 
Vernonia Palmeri Rose, Contr. U. S. Nat. Herb. 1: 101. 1891. 
Vernonia chacalana S. F. Blake, Contr. Gray Herb. 52:19. 1917. 
Stems freely branched, 2-5 m. high, closely sericeous-pubescent, becoming glabrous in 
age; leaf-blades lanceolate, 7-16 cm. long, 2-3 cm. wide, acute, entire or remotely serrulate, 
obtuse or subacute at base, thinly pubescent and resinous above, pubescent to subtomentose 
and resinous beneath, becoming glabrate when old; heads 3- or 4-flowered, short-peduncled, 
in large pyramidal or depressed clusters; involucre cylindric to narrowly campanulate, 5-6 
mm. high; scales loosely imbricate, the outer broadly triangular, obtuse, densely ciliate, the 
inner progressively longer, scarious, glabrous on the back, pale-green or straw-colored with a 
green midvein, conspicuously ciliate, obtuse to subacute, resinous near the apex; achenes 
hirsute, 2 mm. long; pappus white, 4 mm. long, the outer series filiform, irregular, 1-1.5 mm. 
long. ‘ 
TYPE LOCALITY: Alamos, Sonora. 
DISTRIBUTION: Sonora and Durango. 
3. Eremosis barbinervis (Schultz-Bip.) Gleason, Bull. 
N: Y. Bot. Gard.)4: 232: 1906: 
Vernonia barbinervis Schultz-Bip.; Seem. Bot. Voy. Herald 297. 1856. 
Cacalia barbinervis Kuntze, Rev. Gen. 969. 1891. 
Stems nearly glabrous; leaf-blades thick, firm, broadly elliptic, 9-12 cm. long, 4-5 cm. 
wide, obtuse or subacute, entire, narrowed at the base, nearly glabrous above, beneath densely 
tomentose along the midvein, thinly and interruptedly pubescent or tomentose on the lateral 
veins, resinous and essentially glabrous on the surface; inflorescence hemispheric; heads 
3-flowered; involucre narrowly campanulate, 7 mm. high; scales thin, straw-colored, scarious 
at the margin, the outer ovate, sharply acute, somewhat arachnoid, the middle conspicuously 
