250 KEY AND FLORA 



hardened receptacle, firmly covered by the stiff iuvolucre, 

 obovoid or top-shaped, not beaked; pappus 1 or 2 rows of 

 short scales. 



1. C. Intybus L. Chicory, Blue Dandeliox, Blue 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 Sehreber. (ADOPOGOW) 



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 10-1.5 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. 



