392 COMPOSITAE SCORZONELLA 



UROPAPPUS 



all with dilated base and more or less abrupt acumination : achenes co]-^ 

 umnar, 2 lines long: palese of the pappus deltoid or triangular-ovate, ab- 

 ruptly tipped with an awn or bristle 8 or 9 times longer. Alluvial grounds, 

 British Columbia to Northern California. 



S. leptosepala Nutt 1. c. Microseris leptoscpala Gray. Stems slen- 

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

 atte'nuate-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, British Columbia to California. 



S. Bolanderi Greene 1. c. Microseris Bolanderi Gray. Stems slen- 

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

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

 involucre 6-9 lines high, its bracts all gradually lanceolate attenuate ffom 

 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 California. 



S. Howelli Greene 1. c. Microseris Howetli Gray. A foot or more 

 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, and 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, Southwestern 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 shorter, 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 cal- 

 losity not angled. Paleae of the pappus 5, elongated, flat, hispid 

 and short-awned at the apex. 



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

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

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

 achenes black, slender, tapering above almost to a beak, 6-8 lines long: 

 paleae 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. macrochaetus Greene Pitt, iii, 137. Microseris macrochaeta Gray. 

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

 high, 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. 



