476 



COMPOSITAE. 



[Vol. III. 



Heads 4"-6" high; involucre with several short outer bracts. 

 Leaves pinnatifid; plant viscid-pubescent; achenes glabrous. 

 Basal leaves obovate, orbicular, or spalulate, merely dentate. 



21. S. Tulgaris. 



22. S. viscosus. 

 Varieties of Nos. 9, 10 and 15. 



I. Senecio Pseudo- Arnica Less. Sea- 

 beach Senecio. (Fig. 4033.) 



Arnica ma li lima L. Sp. PI. SS4. 1753. Not 5. 



maritinius L. 

 Senecio Pseudo-Arnica Less. Linnaea, 6: 240. 1S31. 



Perennial, somewhat fleshy; stem stout, mostly 

 simple, \erx leafy, 6'-3° high. Leaves oblong-ob- 

 ovate, or the lower spatulate, acute or obtuse at the 

 apex, 4'-S' long, 'i'-2' wide, densely tomentose 

 beneath, at least when young, repand-dentate or 

 denticulate, narrowed to a sessile and partly clasp- 

 ing base, or the lowest into margined petioles; 

 heads solitary, or several 1 2-7 i ami corymbose, 

 stout-peduiicled, i,'j'-2' broad, nearly i' high; in- 

 volucre broadly campauulate, its bracts lanceolate, 

 acuminate, mostly tomentose, commonly with sev- 

 eral subulate spreading ones at the base; rays 12- 

 15, linear, 3-toothed, conspicuous; disk-corollas 

 5-lobed; achenes glabrous; pappus dull. 



On sea-beaches and rocks near tht- sea. Maine, New 

 Brunswick and the lower St. Lawrence to Labrador 

 and the .Arctic Sea. .\lso in .\laska and northern 

 Asia. July-.\ug. 



2. Senecio frigidus Less. Arctic Senecio. 

 (Fig. 4034.) 



Senecio frigidus Less. Linnaea, 6: 239. 1S31. 



Perennial, more or less tomentose, or becoming 



glabrous vpheu old; stem slender, 6'-i2' high, 



bearing a solitary head (rarely 2 or 3) y^'-i' broad. 



Basal and lower leaves spatulate or obovate, i'-2' 



long, petioled, obtuse, repand-dentate or entire; 



stem-leaves oblong to linear-lanceolate, obtuse or 



acute, sessile, mostly entire, smaller; involucre 



broadly campanulate, its bracts lanceolate, acute, 



■with no exterior smaller ones; rays 10-16, 5"-io" 



long, 3-toothed, linear-oblong, or cuneate at the 



base; achenes glabrous or sparingly pubescent; 



pappus white. 



Labrador and arctic -America to Alaska. Also in 

 northeastern Asia. Summer. 



3. Senecio integerrimus Xutt. 

 Entire- leaved Groundsel. (Fig. 4035.) 



Senecio integerrimus Nutt. Gen. 2: 165. iSiS. 



Perennial, more or less woolly when young, 

 glabrous or nearly so when old; stem stout, 

 i°-4° high. Leaves entire, or sparingly dentic- 

 ulate, somewhat fleshy, the lower and basal ones 

 oval or oblong, obtuse or obtusish at the apex, 

 3'-6' long, I'-iJi' wide, petioled, the upper 

 linear or lanceolate, acute, the uppermost very 

 small; heads numerous, corymbose, long-pedun- 

 cled, 6"-io" broad; involucre nearly cylindric, 

 4"-5" high, its principal bracts linear, acumi- 

 nate, green, usually with a few subulate outer 

 ones; rays S-12, linear-oblong; achenes nearly 

 glabrous, pappus white. 



Minnesota and JIanitoba to Wyoming and British 

 Columbia. June-July. 



