404 



COMPOSITAE. 



[Vol. III. 



46. ADENOCAULON Hook. Bot. Misc. i: 19. 1830. 



Perennial herbs, with broad alternate slender-petioled leaves, woolly beneath, and pani- 

 cled small heads of tubular flowers. Involucre campanulate, composed of a few herbaceous 

 bracts. Receptacle nearly flat, naked. Corollas all tubular, 4-5-lobed. Marginal flowers 

 pistillate, fertile. Central flowers perfect, sterile, the style undivided; anthers slightly 

 sagittate at the base. Pappus none. Achenes obovoid or clavate, very obtuse, faintly 

 ncr\'ed, glandular above, longer than the bracts of the involucre. [Greek, gland-stem.] 



About 3 species, natives of North America, Japan, the Himalayas and Chile. Only the following 

 is known in North America. 



1. Adenocaulon bicolor Hook. Adeno- 

 caulon. (Fig. 3860.) 



.Irf^HOCflj/Zow i/fo/orHook. Bot. Misc. I: 19. pi. !j. 1S30. 



Stem floccose- woolly, or at length glabrous, i°-3° 

 high, leafless and mostly paniculatcly branched above. 

 Leaves all basal or nearly so, deltoid-ovate, obtuse 

 or acute at the apex, deeply cordate at the base, 

 coarsely repand-toothed or lobcd, thin, green and 

 glabrous above, densely and persistently white-woolly 

 beneath, 2'-6' long and broad, with slender narrowly 

 margined petioles; heads numerous, very slender- 

 peduncled, small; bracts of the involucre 4 or 5, ovate 

 to lanceolate, reflexed in fruit, at length deciduous; 

 achenes 3"-4" long, %" thick, the upper part beset 

 with nail-shaped glands. 



In moist woods, Northern Michigan and Lake Superior 

 to British Columbia and California. May-July. 



47. INULA I.. Sp. PI. 881. 1753. 



Perennial, mostly tomentose or woolly herbs, with alternate and basal leaves, and large 

 heads of both tubular and radiate yellow flowers. Involucre hemispheric or campanulate, 

 its bracts imbricated in several series, the outer often foliaceous. Receptacle flat or convex, 

 areolate or foveolate, not chaffy. Ray-flowers pistillate, their ligules 3-tootbed. Disk- 

 flowers perfect, their corollas tubular, 5-toothed. Anthers sagittate at the base, the auricles 

 caudate. Style-branches of the disk-flowers linear, obtuse. Acheues 4-5-ribbed; pappus of 

 capillary rough bristles in our species. [The aucient Latin name.] 



About 90 species, natives of Europe, Asia and Africa. 



1. Inula Helenium L. Elecampane. 

 Horseheal. (Fig. 3861.) 



Inula Helenium L. Sp. PI. SSi. 1753. 



Stems tufted from large thick roots, simple 

 or rarely somewhat branched, 2°-6° high, 

 densely pubescent above. Leaves large, 

 broadly oblong, rough above, densely pubes- 

 cent beneath, denticulate, the basal ones 

 acute at each end, long-petioled, io'-2o' long, 

 4'-8' wide; stem leaves sessile, or cordate- 

 clasping at the base, acute at the apex, 

 smaller; heads solitary, or few, terminal, 

 stout-peduncled, 2'-4' broad; involucre hemi- 

 spheric, nearly 1' high, its outer bracts ovate, 

 foliaceous, pubescent; rays numerous, linear; 

 achenes glabrous, 4-sided. 



Along roadsides and in fields, Nova Scotia to 

 Ontario and Minnesota, south to North Carolina 

 and Missouri. Naturalized from Europe. Native 

 also in Asia. Called also Scabwort, Horse-elder, 

 Yellow Starivort, Elfdock. 



