390 COMPOSITAE HYPOCHOEEIS 



PTILOCALAIS 



long-acuminate; peduncles very much thickened and hollow for 1-3 inches 

 below the heads : heads 3-4 inches broad, very showy : bracts of the in- 

 volucre linear-lanceolate, acuminate usually much longer than the purple 

 rays : achenes sometimes 3 inches long, the outer ones covered with scale- 

 like tubercles especially on the ribs below. Escaped from cultivation. 



97 HYPOCHAERIS L. Gen. n. 918, 



Mostly perennial herbs with scape-like often branching stems, 

 chiefly radical leaves and large heads of yellow flowers. Invo- 

 lucre campanulate of somewhat herbaceous marginless bracts 

 impricated in several series. Receptacle paleaceous with soft, 

 narrow and scarious scales among the flowers. Anthers sagit- 

 tate. Style-branches slender, obtusish. Achenes oblong or fusi- 

 form, tapering upward at .least the inner ones into a beak. Pap- 

 pus a series of fine plumose bristles, with or without some naked 

 and shorter outer ones. ' 



H. radicata L. Sp. 811. Stems several together from a perennial 

 root, slender, 1-3 feet high, branched or rarely simple, bearing a few scales, 

 leaves oblanceolate to obovate in outline, pinnatifid-lobed to dentate, 3-6 

 inches long, hirsute on both sides : involucre oblong-cylindric, about an 

 inch high its bracts glabrous, or sparingly pubescent: achenes rough, all 

 with very slender beaks longer than the body. In waste places, Western 

 Washington to California. Naturalized from Europe. 



98 PTILOCALAIS Greene Bull. Cal. Acad, ii, 59. 

 MICROSERIS § PTILOPHORA Gray. 

 Glabrous herbs from fusiform biennial roots laciniately cut 

 leaves and middle-sized to large heads of yellow flowers. Heads 

 nodding in bud. Involucre campanulate, its bracts imbricated 

 in several series, the inner long-acuminate the outer successively 

 shorter and acute. Receptacle flat, foveolate. Achenes linear- 

 columnar, of the same diameter from base to summit. Pappus 

 bright white, soft, of 15-20 truncate or emarginate pale£e termin- 

 ating in a long, soft-plumose capillary bristle or awn and often 

 with one or more short external merely scaiirous bristle. 



P. nutans Greene 1. c. Microseris nutans Gray. Stem slender, 6-18 

 inches high : roots either fascicled or solitary : leaves from entire and 

 spatulate-obovate to pinnately parted into narrow linear lobes : heads 8-20 

 flowered, slender-peduncled : involucre cylindraceous, of 8-10 linear- 

 lanceolate gradually acuminate principal bracts and a few short calyculate 

 ones below, bristles of the pappus several times longer than the oblong 

 palese. In open pine woods, Britsh Columbia tp California and Montana, 



P. major Greene 1. c. Microseris major Gray. Stout, often more 

 than 2 feet high: leaves oblong lanceolate, entire or sparingly laciniate: 

 involucre sometimes an inch high; its lanceolate bracts imbricated in 3 

 lengths. Idaho to Utah. 



99 MICROSERIS Don Phil. Mag. xi. 388. 



Acaulescent glabrous annuals with entire or laciniately lobed 

 or pinnatifid leaves and rather small nodding heads of yellow 

 flowers on slender peduncles. Involucre oblong-cylindraceous to 



