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 Dandelion, 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 runoinate ; 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 w^aste 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 iuvolucre 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. 



