390 COMPOSITE. Senecio. 



S. Cardamine, GREENE. Scapes a span or two high, slender, bearing solitary or 2 or 3 

 small (about 4 lilies high) heads, and below one or two very small oblong-cordate clasping 

 pinnatifid-deutate bract-like leaves : radical leaves orbicular-cordate, repand-crenate, thiimish, 

 inch or two in diameter, on long slender petioles : rays about 8, pale yellow. Bull. Torr. 

 Club, viii. 98. New Mexico, on the higher slopes of the Mogollou Mountains, Greene. 



d. Stems low (2 to 6 inches high) and slender, 1-2-cephalous, few-leaved : leaves mostly lyrate- 

 piimatittd. High northern species. 



S. resedifolius, LESS. Glabrous or soon glabrate : stems simple : earlier radical leaves 

 roundish or subcordate, crenate or creuately lobed, later ones lyrate-pinnatifid, sleuder- 

 petioled, all or the terminal lobes crenate-iucised : heads 4 or 5 lines high : involucre very 

 obscurely bracteolate : rays 5 lines long : style-branches commonly with slender cusp : 

 akenes either papillose-hirsute or glabrous. Less, in Linn. vi. 243 ; Hook. Fl. i. 333, t. 117 ; 

 Torr. Gray, Fl. ii. 445. Cineraria li/rata, Ledeb. Fl. Alt. iv. 102; Reicheub. Ic. Bot. 

 Crit. ii. t. 101. From Great Bear Lake, &c., near the Arctic Circle, to Kotzebue Sound and 

 the Aleutian Islands. (N. Asia.) 



Var. Columbiensis. Heads rayless: stems often sparingly branched and 2-4- 

 leaved. Mucklung River, British Columbia, Mr. Mackay. 



e. Stems a foot or two high (or in reduced forms lower), bearing some leaves and corymbosely 

 cymose (only when depauperate solitary) heads: involucre sparingly or inconspicuously calycu- 

 late, or nearly naked at base: foliage various. Not arctic nor alpine, except perhaps one vari- 

 ety of S. aureus: usually some floccose tomentum, at least when young. 



1. Leaves all entire, rarely a tooth or a few obscure denticulations, and narrowed at base. 



S. fastigiatus, NUTT. Cinereous with a fine and close paunose tomentum, or glabrate : 

 stems strict, simple, 1 or 2 feet high, terminated by a fastigiate cyme of several heads, or 

 sometimes with branches terminated by single and rather larger heads : leaves lanceolate 

 or spatulate-lanceolate, obtuse, about 2 inches long ; upper often linear ; lower cauline and 

 the sometimes oblong radical tapering into slender petioles : heads 4 or 5 lines high : rays 

 conspicuous: akenes glabrous. Trans. Am. Phil. Soc. vii. 410; Torr. & Gray, Fl. ii. 439. 

 Plains of Oregon, Washington Terr., and adjacent Idaho ; first coll. by Nuttall. 



Var. LayneSB. Stems disposed to branch, and the branches to bear 2 or 3 or some- 

 times solitary heads, of half-inch in height : leaves mostly apiculate-acute. S. Laynece, 

 Greene in Bull. Torr. Club, x. 87. Sweetwater Creek, El Dorado Co., California, Mrs. K. 

 Layne-Curran. 



2. Leaves from entire or serrate to pinnatifid in the same species, none pinnately divided : rays 

 occasionally wanting. Species of perhaps impossible limitation. 



S. canus, HOOK. Permanently canescent with pannose tomentum, or at length flocculent, 

 but rarely at all glabrate : stems from a span to a foot or rarely 2 feet high : leaves some- 

 times all undivided or even entire, the radical and lower from spatulate to oblong or round- 

 ish-oval (half-inch to thrice that length) and slender-petioled, sometimes laciuiate-toothed 

 or pinnatifid (either the upper or lower ones, or both) : heads 4 or 5 lines high: akenes 

 very glabrous (in figure of Hooker hispidulous on the angles) : style-tips usually with central 

 cusp. Fl. i. 333, t. 116 ; Torr. & Gray, 1. c. ; Gray, Bot. Calif, i. 412. S. integrifolius, Nutt. 

 Gen. ii. 165. Cineraria integrifolia minor, Pursh, Fl. ii. 528. S. Purshianus, Nutt. Trans. 

 Am. Phil. Soc. vii. 412. S. Howcllii, Greene, Bull. Torr. Club, viii. 98. Rocky banks, 

 Saskatchewan and Dakota to the mountains of Colorado, west to Brit. Columbia, Oregon, 

 Nevada, and the Sierra Nevada as far as Kern Co., California. A notable and dubious 

 form, low and stout, with comparatively large heads and always undivided leaves, abounds in 

 the mountains of Colorado, at the upper limit of trees. 



S. tomentosus, MICHX. Canesceut or cinereous with a close or at length floccose and 

 more or less deciduous wool: stems rather stout, commonly 2 feet high : leaves thickish, ob- 

 long, crenate or sometimes entire ; the larger radical ones ample, 5 or 6 inches long, on 

 elongated stout petioles and with stout midrib ; cauliue similar and smaller or lyrate-pin- 

 natifid, often few and small : heads, &c., of the next species : akenes always hispidulous, at 

 least on the angles. Fl. ii. 119; Ell. Sk. ii. 329; Torr. & Gray, Fl. ii. 443. S. integri- 

 folius, var. heterophyllus, Nutt. Gen. ii. 165. Cineraria hetcrophi///a, Pursh, Fl. ii. 528. 

 Open or sparsely wooded moist ground, Delaware to Florida and Arkansas ; first coll. by 

 Michaux. 



