44 ROBINSON. 



h. Heads in dense terminal and lateral co- 

 rymbs i. 



i. Stems when young furrowed and angulate, 

 covered with long, spreading conspicuously 

 dark-jointed hairs; leaves olive-green 

 beneath, prominently and loosely reticu- 

 late-veiny on lower surface, in age stronglj^ 

 buUate-rugose above 8. E. scabrum. 



i. Stems rather finely ribbed, nearly terete, 

 softly and often sparsely pubescent, the 

 hairs short, light-colored, not conspicu- 

 ously jointed; leaves not prominently 



netted beneath nor bullate above 9. E. odoratum. 



h. Heads in (at maturity) open panicles j. 



j. Leaves deltoid-lanceolate, truncate at the 



base 10. E. clematitis. 



j. Leaves elliptic-lanceolate, cuneate at- the 



base 1 L E. Jelskii. 



1. E. IVAEFOLIUM L. Syst. ed. 10, 1205 (1759) [as iuacfolmm]; 

 Robinson, Proc. Am. Acad. liv. 275 (1918). E. fasciculare Poepp. in 

 Poepp. & Endl. Nov. Gen. ac Spec. iii. 54 (1845). — Huanuco: Cassapi, 

 Jan. 1830, Poejjpig, no. 1660 (\^ienna Hofmus., phot. Gr.). Without 

 locality: Matheics, in 1862 (N. Y.). The plant of Poeppig is rather 

 slender and short-leaved in the manner of var. extrorsum (Sch. Bip.) 

 Bak. in Mart. Fl. Bras. \-i. pt. 2, 290 (1876), as extrorsa, which, however, 

 appears to be merely a reduced state, the result perhaps of local drought. 

 [Braz. to southern U. S.] 



2. E. SERRATULOiDES HBK. Upright opposite-branched smooth 

 ish herb 4-6 dm. high; stem round, striate but nearly smooth; inter- 

 nodes rather long, much exceeding the leaves; these opposite, ovate, 

 short-petioled, crenately 4-6-toothed on each side, 3-nerved, narrowed 

 to an obtuse or rounded apex (not actually acute as stated in original 

 diagnosis), roughish above, ciliate on the margin, glabrous beneath, 

 1.5-3 cm. long, half as wide, entire at the cuneate base, membranaceous; 

 petiole 3.5-4.5 mm. long; heads subsolitary on the short upper branches, 

 pedicellate, 8 mm. long; involucre campanulate-cylindric, the scales 

 numerous, closely appressed in several series, rounded at the dark-purple 

 tip, ciliate but otherwise glabrous and shining, excessively caducous; 

 florets 7-8 mm. long, scarcely exceeding the involucre; corolla slenderly 

 tubular, scarcely ampliated above, violet and smooth; pappus whitish, 

 barbellate, nearly as long as the corolla. — Nov. Gen. et. Spec. iv. 117 

 (1820); DC. Prod. v. 143 (1836). Osmia scrratuloides (HBK.) Sch. 

 Bip. Pollichia, xxii.-xxiv. 252 (1866). — Piura: steep slopes in cool 

 region, Huancabamba, Humholdt & Bonplanci, no. 3525 (Par., phot. Gr.). 



3. E. ERiPsiMUM Robinson (p. 14). Decumbent undershrub ; stems 



