SENECIONIDE.E. 211 



4. A. biennis, Willd. Annual, erect, virgate, 1 — 3 ft. high, leafy to the 

 summit: herbage deep green, glabrous and tastetess, nearly: leaves 1 — 

 2-pinnately parted into lanceolate or broadly linear laeiniate or toothed 

 lobes, or the uppermost only pinnatifid: heads small, in close glomerules 

 on the spioiform short branches and main stems: achenes with small 

 epigynous disk and no pappus. — Mostly in or near cultivated ground, at 

 West Berkeley, etc. Aug.— Oct. 



5. A. heterophylla, Nutt. Strictly erect, 3 — 5 ft. high, simple and 

 leafy up to the short naked dense panicle; herbage bitter and aro- 

 matic: leaves white beneath with cottony tomenttim, green and glabrale 

 above, 2 — 4 in. long, lanceolate or broader, acute, often laciniately toothed 

 or cleft, as often entire, of firm texture : heads very numerous, 2 lines 

 high, seldom as broad. — Very common in low. rich land, along streams, 

 etc. July — Oct. 



Suborder 9, Senecionide/E. 



Plants herbaceous or suffrutescent, mostly with watery juice, but pun- 

 gent; some genera bitter and aromatic. Bracts of involucre herbaceous, 

 in 1 or 2 series. Receptacle naked. Anthers not caudate; sometimes 

 sagittate. Style-branches of perfect flowers obtuse or truncate; in some 

 penicillate. Pappus of capillary bristles. 



Heads subdioecioae; flowers whitish Petasites 64 



Heads large; flowers yellow; 



Leaves palmaliiid Oacaliopsis 65 



" ovate or rounded, or pinnatifid; 



Pappus brownish, not copious Arnica 66 



• " white, fine and copious Senecio 67 



Heads small, mostly cylindric; flowers yellow Seneoio 67 



64. PETASITES, Tourn. Perennial herbs, with creeping rootstocks 

 sending up early scapiform leaf y-bracted flowering stems, and later ample 

 long-petioled radical leaves which are cottony-tomentose at least when 

 young. Flowers whitish or purplish, in a racemose corymb, subdice- 

 cious. Achenes narrow, 5 — 10-costate. Pappus elongating in age, very 

 soft' and white. 



1. P. palmata (Ait.), Gray. Leaves of round-reniform outline, 7 — 10 

 in. broad, palmately 7 — 11-cleft to beyond the middle, these appearing . 

 later than the very early flowering stems. — Wet mountain woods, at 

 Taylorville, Marin Oo,, etc. PI. March. 



65. CACALIOPSIS, A. Gray. Floccose-woolly stout perennial, with 

 ample palmatifld leaves appearing before the flowers. Stem stout, with 

 few large rayless heads of yellow flowers. Involucre campanulate, of 

 many lanceolate-linear acuminate bracts. Corolla with cylindraceous 

 throat longer than the slender tube. Style puberulent below the flatfish 

 branches. Achenes 10-striate. Pappus copious, soft, white. 



