104 COMMON CANADIAN WILD PLANTS. 



9. Tauace'tiun. Flowers yellow, in numerous corymbed heads. 

 Scales of the involucre dry, imbricated. Pappus 5-lobed. 

 Leaves dissected. 



10. Arlomis i.-i. .Flowers yellowish or dull purplish, in numerous 



small heads which are panicled or racemed. Scales of the 

 involucre with dry and scarious margins, imbricated. Achenes 

 with narrow top. 



****Pappus of all the florets bristly. Receptacle naked. 



11. Erechtl'tes. Flowers whitish. Scales of the involucre in a 



single row, linear, with a few bractlets at the base. Corolla of the 

 marginal florets very slender. Pappus copious, of fine soft 

 white hairs. Heads corymbed. Erect and coarse herbs. 



12. Gnapha'llum. Flowers whitish or yellowish. Scales of the 



involucre yellowish-white, in many rows, dry and scarious, 

 woolly at the base. Outer corollas slender. Pappus a single 

 row of tough bnstles. Flocculent- woolly herbs. 



13. Antenna'rla. Very much like Gnaphalium in appearance, being 



white-woolly, but the heads are usually dicecious, and the 

 bristles of the pappus thicker in the sterile florets. 



+- -f- All the florets in the head perfect. 



13. Antenna' ria, with dioecious heads, may be looked for here. See 



previous paragraph. 



Bldens. One or two species have no rays. See No. 41. 

 Sene'cio. One species is without rays. See No. 19. 



14. Lia'triH. Flowers handsome, rose-purple. Receptacle naked. 



Pappus of long and slender bristles, plumose or rough. A.chenes 

 slender, 10-ribbed. Lobes of the corolla slender. Stem wand- 

 like, leafy, from a corm or tuber. Leaves narrow or grass-like. 



15. Verno'uia. Flowers purple. Scales of the involucre (with us) 



with slender bristly tips. Receptacle naked. Pappus, double, 

 Jhe outer minute, the inner capillary. Branches of the style 

 long and slender, minutely bristly. 



16. Eupato'rlum. Flowers white or purple. Receptacle naked. 



Pappus of slender hair-like bristles, smooth or nearly so. 

 Achenes 5-angled. Heads in corymbs. Leaves whorled, or 

 connate, or opposite. 



* * *- Marginal florets pistillate and fertile, those in the centre of 

 the head staminate and sterile. Receptacle chaffy. Pappus 

 wanting. 



