408 ASTERACEAE. 



2. U. lindleyi (DC.) Nutt. Stout, 2-4 dm. high; peduncles 

 scarcely thickened under the head; leaves as in the last or somewhat 

 broader; achenes brownish, 10 mm. long, slightly narrowed above; 

 pappus dull brown or sordid, 12-14 mm. long; awn nearly equaling 

 the palese, from a very shallow notch. 



Same range as the last, but not common. 



73. HYPOCHAERIS L. 

 Mostly perennial herbs, with scapose, often branched 

 stems, mostly basal tufted leaves, pinnatifid or entire, 

 and mostly large long-peduncled heads. Involucre 

 oblong-cylindric to campanulate, its bracts herbaceous 

 in several series. Receptacle flat, chaffy. Flowers 

 yellow. Achenes oblong to linear, 10-ribbed, contracted 

 above or the outer truncate. Pappus of 1 row of plu- 

 mose bristles, sometimes with some shorter simple ones. 



1. H. radicata L. Perennial; stems several, slender, 3-6 dm. 

 high, branched or rarely simple; leaves spreading on the ground, 

 oblanceolate to obovate, pinnatifid-lobed to dentate, 5-15 cm. long, 

 hirsute; heads 2.5 cm. broad or more; achenes rough, all with slender, 

 long beaks. 



Pasadena, McClatchie. 



2. H. glabra L. Scapes several, erect from an annual tap root, 

 1-5 dm. high; herbage glabrous; leaves broadest above, denticulate 

 to lobed; flowers longer than the involucres; outermost achenes 

 truncate, the others beaked. 



A naturalized weed, found in gardens and cultivated fields. 



74. PTILORIA Raf. 

 Annual or perennial, mostly glabrous, often glaucous 

 herbs, with erect simple or branched usually rigid stems, 

 alternate or basal entire or runcinate-pinnatifid leaves, 

 those of the branches often small and scale-like, and 

 small erect heads of usually pink flowers paniculate or 

 solitary at the ends of the branches. Involucre cylin- 

 dric or oblong, its principal bracts few, equal, scarious- 

 margined, slightly united at the base, with numerous 

 short exterior ones. Flowers pinkish, opening in the 

 morning. Receptacle flat, naked. Anthers sagittate at 

 base. Style-branches slender. Achenes oblong or linear, 

 terete, 5-ribbed, truncate or beaked at summit. Pappus 

 of 1 series of rather rigid plumose bristles. 



Herbage glabrous. 



Achenes with a deep groove between the ribs. 1. P. virgata. 



Achenes without a deep groove between the 



ribs. 2. P. pleurocarpa. 



Herbage woolly, becoming glabrate. 3. P. cichoriacea. 



