SENECIO COMPOSITE 377 



** *+ Plants mostly in clumps or tufts, or from tufted or creeping 

 rootstocks : stems commonly robust, 1-5 feet high, bearing mostly 

 numerous heads in a cyme : leaves from entire to dentate, none really 

 cordate, nor with permanent tomentum : usually more or less woolly- 

 pubescent when > oung, often quite glabrate and green at flowering 

 time : heads many-flowered : rays 8-12, conspicuous. 



S. Colnmbianns Greene Pitt, iii, 170. S. lugens in part of authors, not 

 of Richardson. Floccose-wcolly when young, at length glabrate : stems 

 stout, 2-4 feet high, from a fascicle of coarse fibrous loots: leaves thick, 

 very variable, from oblong to lanceolate, variously dentate to serrulate ; 

 the lower petioled; the upper sessile by a broad base: heads numerous, in 

 an ample cymose panicle: involucre campanulate, 6-8 lines high; its num- 

 erous bracts lanceolate, acute or acuminate, with or \\iihout black tips: 

 rays yellow, 6-8 lines long, oblong to oblanceolate. Common on plains 

 and hills, Brit. Columbia to California and Nebraska. 



S. exaltatus Nutt Trans. Am. Phil. Soc. vii, 410. Sparingly villous 

 when young, at length glabrous: stems stout, 2-3 feet high, simple, naked 

 above: leaves thick, equally crenate-denticulate; the radical and lower cau- 

 line broadly lanceolate-oblong, obtuse, on long petioles ; the upper lanceo- 

 late, acute, partly clasping, serrate : heads small, numerous, in a compound 

 fastigiate cyme: bracts of the involucre linear, with pubescent purplish 

 or black tips : rays 6-8. oblong, short: achenes glabrous. Plains of the 

 Columbia. Oregon and Washington. S. lugens var. ochroleucus Gray ap- 

 pears to be a nearly white-flowered form of this. 



S. cordatus Nutt. 1. c. More or less pubescent, especially toward the 

 base of the stem: stem solitaty. 2-6 feet h : gh, from a fascicle of fibrous 

 roots, sulcate angled : lower leaves cordate-ovate, repandly serrulate or 

 nearly entire, obtuse, on long petioles; the upper lanceolate, clasping, ser- 

 rate : heads numerous, in a nearly simple corymb : bracts of the involucre 

 about 15, linear, with pubescent black tips frays 5-6, oblong. On sandy 

 hills Sauvie Island near the mouth of the Willamette River 



S. Orcganns. Glabrous throughout: stems rather slender, 2-3 feet 

 high, from a somewhat woody caudex: leaves from spatulate to linear, 

 usually narrowly lanceolate, narrowed below to a slender petiole with a 

 dilated base, acutish to acuminate, more or less remotely denticulate; 

 the lowest ones, including the pet ole, 4-8 inches long; the upper ones 

 reduced to sessile subulate or setaceous bracts: heads 8-20, in a close 

 umbel the rays of which elongate forming a loose cymose panicle in fruit : 

 bracts of the involucre linear-lanceolate or linear, acuminate, with black 

 tips : rays yellow, spatulate, 4-6 lines long : achenes about 2 lines long, 

 glabrous. In marshes bordering Lake La Dish, Marion Co. Oregon. 



S. fcetidns. Glabrous: stems stout, 2-3 feet high, from a short hard 

 caudex, bearing an ample umbellate cyme of middlesized heads: leaves 

 thin, lanceolate, finely denticulate; the lowest 48 inches long including 

 the petiole, acute, tapering below to a short petiole; upper ones sessile 

 by a broad base, reduced upward to small bracts : involucre 6 lines high, 

 its very numerous linear bracts very acute, green or yellowish, often spar- 

 ingly hispidulous : rays 8-12, yellow : achenes short, glabrous. In swales, 

 Klickitat Valley Washington. This plant has a very unpleasant odor, 

 and my specimens that have been in my herbarium 20 years have not 

 lost it. 



-M- +- -n- Leaves crowded on the matted rootstock nearly veinles : 

 achenes glabrous. 



S. valerianella Greene Pitt, iv, 109. Glabrous: stems slender, de- 

 cumbent at base, 4-6 inches long, from slender densely tufted rootstocks: 

 leaves from round-obovoid to almost orbicular, about 8 lines in diameter, 



