MiCROSERis COMPOSITAE 391 



SCORZONELLA 



hemispherical, inner bracts in one or two series, equal, thin, with 

 membraneous margins, outer very short. Receptacle flat. Achenes 

 terete, 8-10 costate, with a broad basal callosity which is hollowed 

 at the insertion and produced upward into a sharp denticulate 

 scabrous collar-like rim. Paleas of the pappus 4-10, usually 5, 

 mostly short and tapering into a long or short scabrous awn. 



M. Douglasii Gray Proc. Am. Acad, ix, 210. Stems slender, 3-24 

 inches high : leaves chiefly clustered at the base of the stem, linear to 

 spatulate, entire or sparingly laciniate, 1-3 inches long : involucre oblong 

 of 4-10 oblong, obtuse principal bracts and 3-5 very short erose dentate 

 calyculate ones at base : achenes oblong-turbinate, contracted under the 

 summit, 3 lines long: paleas of the pappus, ovate, 2 lines long, tapering 

 abruptly into an awn. Southwestern Oregon to California. 



M. Bigelovii Gray 1. c. Stems slender, 4-12 inches high : leaves lance- 

 olate to linear in outline, entire to laciniately toothed or pinnately parted 

 into linear lobes : involucre campanulate, of 8-10 lanceolate acute or 

 acuminate princpal bracts and several smaller obtuse or barely acute 

 ones at their base: achenes oblong-turbinate, not contracted under the 

 truncate summit, 3 lines long, outermost sometimes villous : paleae of the 

 pappus 5, oblong to lanceolate, gradually tapering to an awn twice or 

 thrice their length. Along the coast, Oregon and California. 



100 SCORZONELLA Nutt. Trans. Am. Phil. Soc. vii, 426. 



MICROSERIS § SCORZONELLA Gray. 



Glabrous perennial herflbs with fusiform biennial roots, lacini- 

 ately cut leaves and long-peduncled heads of yellow flowers that 

 are nodding in bud. Involucre campanulate, its bracts herba- 

 ceous, imbricated in several series, the inner long acuminate, the 

 other shorter and acute. Receptacle flat or convex, foveolate or 

 alveolate. Achenes linear or somewhat turbinate^ 8-10-costate or 

 striate, truncate at summit, the basal callosity acute and not ex- 

 panded, areola lateral. Pappus 5 or 10 ovate or lanceolate paleae 

 tipped with a generally much longer, straight scabrous or bar- 

 bellulate bristle or awn. 



S. procera Greene Bull. Cal. Acad. n. 50. Microseris procera Gray. 

 Stems robust, 2-3 feet high : leaves chiefly oblong apiculate-acuminate, 

 dentate or entire, rarely laciniate-lobed ; larger cauline 6-8 inches long, 

 radical larger : involucre an inch or more high and broad, its bracts in 2 

 or 3 series, the outer ones ovate, the inner ones ovate-lanceolate, all 

 acuminate : achenes nearly columnar 3 lines long, pappus of 10 brownish 

 lanceolate palese with long barbellate awns. Rather common in open 

 places, Washington to California. 



S. pratensis Greene 1. c. 51. Leafy at base only, the scapose pedun- 

 cles 1-2 feet high : leaves linear-lanceolate, long-acuminate, entire, 6-12 

 iriches long: heads an inch high and nearly as broad, bracts of the in- 

 volucre in 3 series, ovate to lanceolate, acuminate : pappus of 10 white or 

 sordid narrowly lanceolate palea with long minutely plumose awns. 

 Moist meadow lands near Ashland, Oregon, and Yreka, California. 



S. laciniata Nutt. Trans. Am. Phil. Soc. vii, 426. Microseris lacin- 

 iatci Gray. Glaucescent : stems rather stout, leafy and branching, 2-3 feet 

 high : leaves laciniate pinnatifid into attenuate lobes, or sometimes entire : 

 radical 4-10 inches long: involucre an inch or less high, its bracts nearly 



