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..
[Diplogon Raf. Amer. Month. Mag. 2: 268. 1818. Not Poiret, 1811.]
Perennial or biennial, rarely annual, branching herbs, with alternate sessile entire leaves, or the basal ones dentate, and large many-flowered heads of both tubular and radiate yellow flowers (rays wanting in some western species), loosely corymbose, or solitary at the ends of the branches. Involucre campanulate to hemispheric, its bracts narrow, imbricated in several series, the outer shorter. Receptacle usually flat, more or less foveolate. Ray-flowers pistillate. Disk-flowers mostly all perfect. Pappus double in both the disk- and ray-flowers, the inner of numerous rough capillary bristles, the outer of smaller or minute scales or bristles. Achenes flattened, oblong-linear or obovate, pubescent. Style-branches narrow, somewhat flattened, their appendages linear or subulate. [Greek, of golden aspect.]
About 20 species, natives of North America and Mexico. Besides the following, about 8 others occur in the southern and western United States. Type species: Chrysopsis gossypina (Michx.) Ell.
Leaves elongated-linear, entire, parallel-veined; achenes linear; involucre campanulate. Plants 1°-3° high, silvery-pubescent; leaves grass-like, 3'-12' long.
1. C. graminifolia.
Plants 4-10 high, woolly-pubescent; leaves rigid, 1 -4 long.
2. C. falcata.
Leaves oblong, lanceolate, or linear, pinnately veined; achenes obovate, or oval; involucre hemispheric. Plant densely woolly-pubescent.
3. G. gossypina.
Plants hirsute, or villous-pubescent.
Heads numerous, corymbose-paniculate: pubescence of long deciduous hairs; eastern species.
4. C. mariana.
Heads fewer, corymbose, or terminating the branches; pubescence persistent; western species. Villous-pubescent, hirsute or hispid; perennials.
Villous-pubescent and canescent with appressed hairs.
5. C. villosa.
Hirsute or hispid-pubescent. Leaves linear, acutish.
6. C. stenophylla.
Leaves mostly spatulate, obtuse.
7. C. hispida.
Pilose-pubescent with soft spreading hairs; annual.
8. C. pilosa.
Inula graminifolia Michx. Fl. Bor. Am. 2: 122. 1803. Chrysopsis graminifolia Ell. Bot. S. C. & Ga. 2: 334. 1824.
Slender, corymbosely branched above, very silvery-pubescent, 1°-3° high. Leaves linear, soft, grass-like, 3-5-nerved, shining, the basal ones 4'-12' long, 2"-5" wide, the upper much smaller, and the uppermost subulate and erect; heads several or numerous, about i' broad, solitary at the ends of the branches; involucre cam-panulate, its bracts glabrate; achenes linear-fusiform.
In dry soil, Delaware to Florida, Ohio, Kentucky, Arkansas, Texas and Mexico. Great Bahama Island. Silver-grass. Scurvy-grass. Silk-grass. Aug.-Oct.