392 COM POSIT M SCORZONELLA 



UROPAPPUS 



2 lines long : paleae of the pappus deltoid or triangular-ovate, abruptly 

 tipped witn an awn or bristle 8 or 9 times longer. Alluvial grounds, Brit- 

 ish Columbia to Northern California. 



S. leptosepala Nutt. 1. c. Microscris leptosepala Gray Stems slen- 

 der, a foot or so high: leaves from linear to lanceolate and from entire to 

 attenuate-pinnatifid, all attenuate: heads comparatively small and few- 

 flowered ; involucre 6-10 lines high, of 6-12 lanceolate acuminate principal 

 bracts and a few small, ovate, abruptly acuminate ones at their base: 

 achenes slender-columnar : paleae of the pappus ovate-lanceolate, or nar- 

 rower, tapering gradually from the base: into an awn or 4 or 5 times as 

 long. Moist ground, Brit ; sh Columbia to California. 



S. Bolanderi Greene 1. c Microseris Bolanderi Gray. Stems slender, 

 1-2 feet high : leaves from narrowly linear- lanceolate to somewhat spatu- 

 late, entire or with a few small salient linear lobes, 6-12 inches long: in- 

 volucre 6-9 lines high, its bracts all gradually lanceolate-attenuate from a 

 broadish base, or some small outermost abruptly acuminate: paleae of 

 the pappus little exceeding the breadth of the'achene, broadly ovate, 

 mostly obtuse, tipped by the long slender awn. In swamps near the 

 coast, Washington to Cali ornia. 



S. Howelli Greene 1. c. Microsesis Howellii Gray. A foot or mote 

 high from a fusiform root slender bearing solitary or 2 or 3 heads : leaves 

 elongated-linear and attenuate, some bearing a few attenuate reflexed 

 lobes: involucre half-inch high, narrow, 15-20 flowered, its bracts all acu 

 minate; the inner oblong-lanceolate, aud all nearly equal; the outer much 

 shorter and mostly ovate achenes 3 lines long, narrower at base: pappus of 

 8 or 10 conspicuous and firm lanceolate paleae 2-3 lines long, tipped with 

 a denticulate-scabrous awn of hardly greater length. Hillsides about 

 Waldo, southeastern Oregon. 



101 UROPAPPUS Nutt. 1. c. 425. 

 MICROSERIS CALAIS Gray. 



Subcaulescent annuals with laciniately lobed or pinnatifid 

 leaves and erect heads of yellow flowers on long scape-like strict 

 and erect peduncles which are thickened above. Involucre cam- 

 panulate, its numerous bracts imbricated in 2 or more series, the 

 outer successively shprter, all thin and scarious margined. Re- 

 ceptacle flat, more or less alveolate-chaffy in the centre. Achenes 

 terete, 8-10-costate, glabrous with scabrous costa, the basal call- 

 osity not angled. Palese of the pappus 5, elongated, flat, hispid 

 and short-awned at the apex. 



U. linearifolins Nutt. 1. c. Microseris linearifolia Gray. Scapes or 

 peduncles 6-24 inches high: leaves linear, coarsely few-toothed or pinnati- 

 fid, 2-6 inches long, more or less villous-pubescent when young: achenes 

 black, slender, tapering above almost to a beak. 6-8 lines long: palese of 

 the pappus silvery- white, linear oblong 4-8 lines long, deeply notched 

 above and bearing slender awns barely half their length. Dry 'hillsides, 

 Brit. Columbia to California and New Mexico. 



U. macrochsetus Greene Pitt, iii, 137. Microseris macroch&ta Gray. 

 " Scapes or peduncles sometimes 2 feet high : involucre narrow, 8-10 lines 

 h'gh, its bracts attenuate-acuminate : palese of the pappus thin, small, cleft 

 quite to the middle from the first, bearing a long and weak awn. South- 

 west Idaho to California. " 



