GENUS 61. THISTLE FAMILY. 473 
1o. Rudbeckia laciniata L. Tall, or Green- 
headed Cone-flower. Fig. 4451. 
Rudbeckia laciniata L. Sp. Pl. 906. 1753. 
Perennial; stem much branched, glabrous, or nearly 
so, 3°-12° high. Leaves rather thin, minutely pubes- 
cent on the margins and upper surface, broad, the 
basal and lower ones long-petioled, often 1° wide, 
pinnately 3-7-divided, the segments variously toothed 
and lobed; stem leaves shorter-petioled, 3-5-parted 
or divided, the uppermost much smaller, 3-lobed, 
dentate or entire; heads several or numerous, 23’—4' 
broad; rays 6-10, bright yellow, drooping; bracts of 
the involucre unequal; chaff of the receptacle trun- 
cate and canescent at the apex; disk greenish-yellow, 
at length oblong and twice as long as thick or longer; 
pappus a short crawn. 
In moist thickets, Quebec to Manitoba, Idaho, Colo- 
rado, Florida and Arizona. Thimble-weed. A double- 
aoe’ form in cultivation is called golden-glow. July-— 
ept. 
A southern mountain race, lower, often only 1° high, 
with smaller heads, has been described as Rudbeckia 
laciniata humilis A, Gray. 
AN 
FEF 
See 
EEE, 
mare 
i 
62. DRACOPIS Cass. Dict. Sci. Nat. 35: 273. 1825. 46: 400. 1827. 
An annual caulescent herb, with smooth and glaucous foliage, and alternate broad thickish. 
entire or slightly serrate, 1-ribbed, clasping leaves. Heads radiate, showy. Involucre flat, 
many-flowered, of few narrow, somewhat foliaceous bracts. Receptacle slender, with early 
deciduous chaffy scales. Ray-flowers few, neutral, the rays yellow or often brownish-purple 
at the base. Disk-flowers perfect, fertile, brownish, their corollas 5-lobed. Style-branches 
with small pubescent appendages. Achenes terete or nearly so, not angled, striate and 
minutely transversely wrinkled. Pappus wanting. [Greek, dragon-like, referring to the 
appendaged style-branches.] 
A monotypic genus of the southeastern United States. 
1. Dracopis amplexicatilis (Vahl) Cass. 
Clasping-leaved Cone-flower. Fig. 4452. 
go eee amplexicaulis Vahl, Act. Havn. 2: 29. pl. 4. 
1783. 
Dracopis amplexicaulis Cass.; DC. Prodr. 5: 558. 1836. 
Annual; glabrous throughout, somewhat glaucous; 
stem branched, grooved, 1°-2° high, the branches 
ascending. Leaves entire or sparingly toothed, I-ribbed, 
m reticulate-veined, the lower oblong to spatulate, ses- 
sile, the upper ovate, ovate-oblong, or lanceolate, 
acute, cordate-clasping ; heads solitary at the ends of 
the branches, long-peduncled, about 2’ broad; bracts 
of the involucre few, lanceolate, acuminate; rays 
yellow, or sometimes brown at the base; disk ovoid- 
oblong, often becoming 1’ high; achenes not angled, 
obliquely attached to the elongated receptacle; chaff 
at length deciduous. 
In wet soil, Missouri to Oklahoma, Louisiana and 
Texas. June—-Aug. 
63. RATIBIDA Raf. Am. Month. Mag. 2: 268. 1818. 
[Lépacuys Raf Journ. Phys. 89: 100. 1819.] 
Perennial herbs, with alternate pinnately divided or parted leaves, and long-peduncled 
terminal heads of tubular and radiate flowers, the disk-flowers gray or yellow, becoming 
brown, the rays yellow, or with brown bases, drooping or spreading. Involucral bracts in 
2 or 3 series. Disk globose, oblong or cylindric. Receptacle columnar to subulate, the con- 
cave chaff subtending or enveloping the disk-flowers, truncate, the tips inflexed, canescent. 
Ray-flowers neutral. Disk-flowers perfect, fertile, their corollas with scarcely any tube. 
