766 PATAGONIAN EXPEDITIONS: BOTANY. 



</3. Receptacle chaffy or naked. Involucral-scales 2 oo-seriate, imbricate, dry, orapi- 

 cally scarious. Style-branches mostly truncate. Pappus none, or coroniform 

 or shortly paleaceous. Leaves alternate, mostly dissected. (Genera 48-52.) 



VII. ANTHEMIDE,E, p. 770. 

 [c. Anthers basally entire, or sagittate, not tailed. (S. Afr. and Austral.) 



X. ARCTOTIDE.E.] 



c2. Anthers basally mucronate, subcaudate. Involucral scales i 2-seriate, subequal 

 (rarely 2 3-seriate, unequal). Style-branches flat-truncate. Receptacle usually 

 naked. Pappus none or woolly, or fugacious from the large achenes. Leaves 

 mostly alternate, rarely dissected. Disk mostly yellow or orange, ray homochro- 

 mous or white. (Genus 56.) IX. CALENDULE/E, p. 771. 



^3. Anthers tailed. Style-branches apically rounded or truncate, not appendaged. Pap- 

 pus mostly setose, sometimes paleaceous or none. 



d. Flowers often ligulate in the ray, tubular and shortly 4 5-merous in the disk. 

 Heads often small and rays none. Anthers apically appendaged. Involucral 

 scales mostly oo-seriate, scarious or herbaceous. Receptacle sometimes palea- 

 ceous. Leaves mostly alternate and entire. (Genera 22-32.) 



IV. INULE.E, p. 768. 



d2. Flowers bilabiate (outer lip 3-, inner 2-merous, both revolute) or deeply 5- 

 cleft, often ligulate in the ray. Involucral -bracts oo-seriate, imbricate (rarely 

 I -2-seriate). Receptacle mostly naked. Leaves mostly alternate, sometimes 

 spinescent, rarely dissected. (Genera 61-79.) XII. MUTISIE^E, p. 771. 



A2. Flowers all ligulate, the ligules 5 -toothed. Plants with milky juice. Anthers mostly tailed 

 and apically appendaged. Involucral-scales i 2-few-seriate, or calyculate. Leaves 

 alternate or basal. (Genera 80-84.) XIII. CICHORIE/E, p. 772. 



II. KEY TO THE GENERA. 



Tribe I. Vernoniece. (Genus I.) Vernonia, p. 773. 



Tribe II. Eupatorica. (Genera 2-4), p. 773. 

 A. Pappus of 2-many pales or awns. Involucral scales 5-6. Anthers appendaged. Achenes 



with 3-5 ribs. Heads with 5 (or 3-4) flowers. 2. Stevia, p. 773. 



A2. Pappus of many bristles, rough, not flexuose, persisting. 



b. Involucral scales 6-many. Pappus bristles free or forming a basal ring. Heads mostly 



many-flowered. 3. Eupatorium, p. 774. 



b2. Involucral scales 4, sometimes with short, outer scales. Heads 4-flowered. Mostly 

 winding herbs or shrubs. 4. Willugbaa {Mikania), p. 777. 



Tribe III. Astercce. (Genera 5-21), p. 778. 

 A. Heads usually with ligulate homochromous rays. 



b. Pappus of 2-8 deciduous awns or small scales. Ray-flowers female, ligulate, or none. 



5. Grindelia, p. 778. 



b2. Pappus mostly of scales (short and with a long awn, or long and narrow), or a short 

 crown, or obsolete. Heads panicled or corymbed or terminating the branches. In- 

 volucre long-campanulate, its scales membranous, not dry on edges, few seriate. 



6. Guticrrezia, p. 779. 



