160 COMPOSITE. 



the involucre 8 10, lanceolate, acute or acuminate, very pubescent and 

 glandular on the back, white and scarious at the summit. E. glaucescens 

 /? leucolepis D. C. E. linearifolium Mich, (in part.) 



Sandy swamps. Long Island, N. Y., to Flor. Aug. Oct. 1j~ <SVem 2 feet 

 high, mostly simple, slender. Leaves 2 inches long and 4 5 lines wide, spread- 

 ing and sometimes recurved. Flowers white. Style much exserted. 



While-scaled Hempweed. 



11. E. pubescens MM. : stem pubescent ; leaves opposite, sessile, ovate, 

 acuminate, sparingly pubescent and glandular-punctate on both sides; 

 lower doubly serrate, upper slightly serrate ; corymb compound, fastigiate ; 

 heads 5-flowered; scales of the involucre 10, linear-lanceolate, acute. 

 E. ovaturn Big. 



Sandy woods. Mass., N. J,, and Penn. Aug. Oct. %. Stem 2 feet high, 

 the lower branches opposite. Leaves thin and slightly scabrous. Flowers white. 



Pubescent Hempweed. 



12. E. album Linn : stem pubescent at the top ; leaves opposite, subses- 

 sile, broad-lanceolate, attenuate at base, with a few coarse teeth at the 

 apex, somewhat scabrous, punctate beneath ; heads 5-flowered, in a ter- 

 minal corymb ; scales of the involucre 10, oblong-lanceolate, acuminate, 

 almost exceeding the corolla, glandular on the back. E. glandidosum 

 Mich. 



Woods. N. Y. to Flor. Aug. Oct. l\..Stem erect, about 2 feet high. 

 Flowers in a terminal fastigiate corymb, white. Scales white at the tips. 



White-headed Hempweed. 



13. E. verben&folium Mich. : stem roughish-pubescent ; leaves opposite, 

 (the upper often alternate,) sessile, ovate-oblong or ovate-lanceolate, scab- 

 rous, coarsely serrate-toothed; corymb compound, somewhat panicled; 

 heads 5 6-flowered ; scales of the involucre 10, oblong-lanceolate, rather 

 acute, hispid-pubescent. E. teucrifolium and lanceolatum Wittd. 



Low woods. Mass, to Car. Aug. Nov. 1\.. Stem 2 3 feet high, erect, 

 rather slender. Leaves sometimes almost incised ; the lower broad at base and 

 closely sessile. Heads somewhat clustered, corymbose. Flowers white. Scales 

 scarious on the margin, white at the tips. Michaux's name for this species has 

 the claim of priority, and, as Mr. Elliott remarks, is equally, perhaps more, ap- 

 propriate. Vervain-leaved Hempweed. 



14. E. rotundifolium Linn. : stem densely pubescent ; leaves opposite, 

 sessile, roundish-ovate or ovate-cordate, obtuse, toothed, veined, pubescent, 

 glandular-punctate beneath ; corymb fastigiate ; heads 5-flowered ; "scales 

 of the involucre 10, acuminate. E. Marriibium Walt. 



Sandy fields. Can. to Flor. Aug., Sept. %.. Stem 2 feet high, slender, 

 roughish-pubescent. Leaves sometimes almost orbicular, sprinkled with resinous 

 dots. Flowers in a flat-topped corymb, white. Round-leaved Hempweed. 



8. MIKANIA. WlLld. Climbing Hempweed. 

 (In honor of Prof. Mikan, of Prague, a botanist of the last century.) 



Heads mostly 4-flo\vered. Receptacle naked, narrow. In- 

 volucre 4-leaved. Corolla with the tube short, dilated or sub- 

 campanulate at the summit, 5-toothed. Anthers somewhat ex- 

 serted. Achenia angled. Pappus in a single series, rough. 



