. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus 46. THISTLE FAMILY. 457 46. ADENOCAULON Hook. Bot. Misc. 1: 19. 1830. 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. Mar- ginal flowers pist
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus 46. THISTLE FAMILY. 457 46. ADENOCAULON Hook. Bot. Misc. 1: 19. 1830. 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. Mar- ginal 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. i. Adenocaulon bicolor Hook. Fig. 4415- Adenocaulon bicolor Hook. Bot. Misc. 1:19. pi. 15. 1830. Stem floccose-woolly, or at length glabrous, i°-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 peti- oles; heads numerous, very slender-peduncled, small; "bracts of the involucre 4 or 5, ovate to lanceolate, re- flexed in fruit, at length deciduous; achenes z"~4" long, I" 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. 47. INULA L. Sp. PI. 88r. 1753. Perennial, mostly tomentose or woolly herbs, with alternate and basal leaves, and large heads of both tubular and radiate yellow flowers. I
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