PAM. 174. 153 



small bracts around; receptacle flat, naked; pappus of copious 



white hairs. ________ Lygodesmia 



L. aphylLa. Stems erect, simple or forking al>ove; leaves rehired to scales, or 

 a few linear leaves at the base; flowers rose-colored to white; achenes nearly 

 as long as the pappus. Dry pine-land. Spring to Fall. 

 Achenes Nakless; — herbs with alternate, entire or toothed leaves, 

 sometimes all basal; heads in corymbs or panicles, or solitary; 

 inner row of involucre consisting of 1-3 series of narrow bracts 

 surrounded by outer bracts, abruptly or gradually smaller; re- 

 ceptacle naked or nearly so, flat; pappus tawny or white. Sandy 

 soil. Summer and Fall. ----- Hieracium, Hawk-Weed 



H. Gronovii. More or less hirsute, tall; stems branched above, leafy below; 

 leaves spatulate to oblong, narrowed into winged petioles below and oval 

 to obovate, small and sessile, higher up. 

 H. Floridanum. Stems more or less hairy, widely branched above, and copi- 

 ously leafy; leaves pubescent, oval-oblong below, ovate above, sessile. 

 Achenes beaked; — heads long-peduncled; involucre double; the in- 

 ner row of several narrow bracts, the outer of several series of 

 smaller bracts; receptacle naked, flat; pappus brownish, of copi- 

 ous hairs surrounded by a ring of shorter hairs. 



Sitilias (Pyrrhopappus), False Dandelion 

 S. Caroliniana (P. Carolinianus.) Leaves pinnatifid to denticulate; heads at 

 the end of the smooth stem or peduncle-like branches. Dry soil. Spring 

 to Fall. 

 Achenes beakless; — succulent herbs with alternate, mainly clasping 

 leaves, the edges and mid vein often prickly; heads in corym- 

 bose panicles, yellow; bracts of the involucre in several rows, 

 unequal, herbaceous or membranous; receptacle flat, naked; 

 pappus of numerous soft white hairs. Waste places. Spring to 

 Fall. ___--__- Sonchus, Sow Thistle 



S. oleraceous. Lower leaves lyrate-pinnatifid, petioled; upper leaves shorter, 



runcinate or lyrate-pinnatfid; clasping by acute bases. 

 S. asper. Leaves spatulate to oblong, the upper clasping by rounded bases. 

 Achenes beaked; — tall herbs, often paniculately branched above, with 

 rather small but often numerous heads of white, yellow or blue 

 flowers; inner involucre of 1-2 series of nearly equal bracts, 

 surrounded by several series of smaller bracts; receptacle flat, 

 naked, ________ Lactuca, Lettuce 



L. graminifolia. Leaves linear or linear-lanceolate, all entire or the lowest pin- 

 natifid; beak of achene shorter than the body; flowers purple or blue, rarely 

 yellowish or white. Open ground. Spring to Fall. 

 L. Canadensis. Basal leaves petioled, spatulate or oblong, dentate or pinna- 

 tifid; stem-leaves sinuate-pinnatifid; beak of achene fully as long as the body; 

 flowers yellow. Open ground. Summer and Fall. 

 L. sativa, Garden Lettuce. Flowers white; cult i vat. 1. 



