This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Perennial herbs, with broad alternate slender-petioled leaves, woolly beneath, and pani-cled small 5-10-flowered 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 nerved, glandular above, longer than the bracts of the involucre. [Greek, gland-stem.]
Two species, natives of North America, Japan and the Himalayas. Only the following typical one is known in North America.
Adenocaulon bicolor Hook. Bot. Misc. 1:19. pl. 15. 1830.
Stem floccose-woolly, or at length glabrous, 1°-3° high, leafless and mostly paniculately 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 lobed, 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, re-flexed 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, Montana and California. May-July.