250 KEY AND FLORA 
hardened receptacle, firmly covered by the stiff involucre, 
obovoid or top-shaped, not beaked; pappus 1 or 2 rows of 
short scales. 
1. C. Intybus L. Curcory, Brur DanpELion, BLur SAILors. 
Root very long, stout, and fleshy; stem 1-3 ft. high, angled and 
grooved; branches straight and stiff. Basal leaves and lower stem 
leaves runcinate; upper stem leaves oblong or lanceolate, clasping, 
those of the branches reduced to bracts. Flowers very showy, usually 
bright blue, rarely pinkish-white. Introduced from Europe; a trouble- 
some weed in grass lands and common in waste places, particularly 
in New England. 
XV. KRIGIA Schreber. (ADOPOGON) 
Small, annual or perennial herbs. Leaves mostly basal, 
toothed or lyrate. Heads several-many-flowered; scales of 
the involucre about 2-rowed, thin. Akenes short, truncate ; 
pappus in 2 rows, the outer one of thin, blunt, chaffy scales, 
the inner one of slender bristles. Corollas yellow. 
1. K. virginica Willd. Annual; scapes usually 2-5 from one root, 
slender. Leaves mostly lyrate, smooth and with a bloom, the earlier 
ones rounded or spatulate. Scales of the involucre linear-lanceolate, 
nearly equal, spreading. Akenes top-shaped, reddish-brown, crowned 
with 5 wedge-obovate scales and 5 rough white bristles. 
2. K. Dandelion Nutt. Perennial, from slender tuber-bearing 
roots; scapes leafless, 6-18 in. high. Leaves entire or nearly so, 
varying from spatulate-oblong to linear-lanceolate. Akenes more 
slender than in No. 1; pappus consisting of 10-15 small, oblong, 
chaffy scales, and 15-20 bristles. In moist ground, especially S. 
3. K. amplexicaulis Nutt. Stem 12-18 in. high, often 2-3 from the 
same root, mostly 2-forked or 3-forked at the summit. Basal leaves 
3-6 in. long, lanceolate, entire, toothed or rarely pinnately cut, clasp- 
ing at the base; stem leaves 1-3. Akenes and pappus about as in 
No. 2. Moist banks. 
XVI. LEONTODON L. 
Perennial, scape-bearing herbs; juice milky. Leaves all 
basal, toothed or pinnatifid, often runcinate. Heads on simple 
or branched scapes, yellow ; bracts of the involucre many, in 
several rows, the anther smaller ; receptacle flat, naked. Arms 
of the style linear, obtuse, hairy. Akenes cylindrical, grooved, 
transversely wrinkled; beak short; pappus hairs stiff, in 1 
or 2 rows, 
