Sen.ecio.] 



XXXIX. COMPOSITAE. 



337 



I. Herbaceous, mostly pebennial. Heads yellow. 



1. Herbs with broad radical leaves and naked simple or branched scapes. 



2 series. 



Leaves rugo-ie and hispid above, ootfeony or woolly, lin.-6in. by lin.-3in. 

 Scape glandular . . 



Leaves Jin.-4in. by Jin.-ljin,, rugose and hispid above, glabrate or cottony 

 beneath. Scape cottony . . 



Leaves 2in. -Sin. by lin.-3in. Entire plant snow-white 



Leaves 3in.-6iu. by lin.-4in., woolly on both surfaces. Scape glandular 



Involucral bracts in 



1. 8. lagopus. 



2. S. bellidioides. 



3. S. Haastii. 



4. S. saxifraqoides. 



Heads large. 



2. Scape erect, simple, 

 Aohenes silky or hispid 



'. Heads corymbose. 



3. Branched, leafy, glabrous cottony or woolly. Involucral bracts 



Annual, soft, Jft.-lft. high. Heads corymbose. Rays . . 



Annual, lft.-3ft. high, much branched above. Bays very short 



Scandent. Leaves palmate, 3-7-lobed. Bays . . 



Erect. Leaves pinnatifid or 2-pinnatifid. Flowers in large corymbs 



Lower leaves entire or lobed ; upper lyrately pinnatifid. Heads in a lax 

 spreading corymb 



Annual or biennial. Branches stout, fistulose. Heada corymbose. Bays 



Annual or biennial. Leaves pinnatifid. Bays 10-15 



Perennial, erect, 2tt.-3ft. high, much branched, glabrous. Leaves toothed, 

 lobulate or pinnatifid. Kays 12-20 '. . 



Leaves entire, oblong-ovate to oblong-lanceolate or variously lobed or pinna- 

 tifid, glabrate or tomentose on one or both surfaces. Bays revolute . . 



Stem zigzag. Leaves glaucous, oblong-ovate, amplexicaul. Heads ^in. broad. 

 Bays about 10 . . 



Stem erect, 2ft.-5ft. high. Leaves 2iu.-4in. long, IJin. broad, amplexicaul, 

 broadly oblong ; veins prominent beneath. Heads Jin. broad 



Leaves lanceolate, acute or acuminate 



Stems numerous, lft.-3ft. high, everywhere glaucous. Leaves 2in.-4in. long, 

 oblanceolate to obovate-spathulate, smuate dentate or serrate 



Stems slender, decumbent, 3in.-6in. long, white. Leaves ovate, white beneath 



5. S. Lyallii. 



in 1 series. 



* S. vulgaris. 



* S. sylvaticus. 



* S. mikanioides. 



* S. Jacobaea. 



* S. aquaticus. 



6. S. antipodus. 



7. S. lautus. 



8. S. latif alius. 



9. S. Golensoi. 



10. S. BanksU. 



11. S. pumiceus. 

 var. angustatus. 



12. S. glauAiophyllus. 



13. S. Pottsii. 



II. Shrubs or small trees. Branches and involucres glabrous, tomentose, woolly, or 

 cottony. Heads panicled, corymbose or rarely solitary. 



4. Leaves linear, revolute to the midrib. 

 Head solitary on a leafy peduncle 



5. Glabrous or nearly so. Leaves membranous. 



a. Bay -florets always present. 



Leaves 6in.-12in. long, broadly lanceolate, pinnate or pinnatifid at base, 

 soaberulous above. Heads lin.-2Jin. in diameter. Bays white 



Leaves 2in.-4in. long, oblong to cuneaterhomboid. Heads ljin.-2in. in 



diameter. Bays distant, white 

 Branches flexuose, climbing. Leaves f in.-lin. long, orbicular crenate. Rays 



4-6, yellow 

 Erect, much branched. Leaves |in.-2in. long, ovate or elliptic-oblong, 



toothed. Bay-fiorets 2, yellow 



6. Leaves usually white beneath, very coriaceous (membranous in 19). Heads paniculate or corymbose. 



Leaves membranous, lanceolate-oblong or elliptic-lanceolate. Panicle 12iri.- 



18in. long, narrow. Heads small, numerous. Rays white . . . . 19. S. myrianthos. 



14. S. bifistulosus. 



15. S. Hectori. 



16. S. Eirkii. 



17. S. sciadophiVus. 



18. S. verdicioides. 



Leaves lanceolate or elliptic-oblong, 

 glandular. Bays few 



Panicles snbcorvmbose, terminal, 



20. S. Huntii. 



