COMPOSITE. 203 



obscurely 3-nerved, tapering at each end, nearly sessile, ciliate at base j 



scales of the involucre lanceolate, ciliate. 



HAB. Dry swamps. Can. to Car. Aug. Sept. 1. Stem very 

 tall, branching, rough near the summit. Leaves paler and often 

 nearly smooth beneath. Flowers in a loose terminal panicle. 

 Rays 12 14, not large. 



8. H. altissimus Linn. : leaves alternate, ovate-lanceolate, serrate, 

 scabrous, 3-nerved, tapering towards the summit, petioled ; petioles 

 ciliate ; scales of the involucre lanceolate, ciliate. 



HAB. Mountain meadows. Penn. to Car. July Sept. 1(. 

 Resembles the preceding, but the stem is smooth and purple. 

 Leaves petiolate, broader and almost ovate-lanceolate. Scales of 

 the involucre shorter. Florets of the ray about 16. JVdld.-Pursh 

 says the chaff of the receptacle is green in this species, but 

 black in the preceding. 



9. H. strumosus Linn. : leaves ovate, acuminate, serrate, 3-nerved, 

 scabrous beneath; scales of the involucre linear-lanceolate, ciliate at 

 base. 



HAB. Can. and N. Eng. Aug. Oct. Zf. Pursh. Uuder the 

 above name Mr. Elliott describes a plant found in North-Caroli- 

 ,na ; but it seems doubtful whether it is really the same. Stem 

 tall, slender, sparingly branched and smooth. Leaves lanceolate 

 or ovate-lanceolate, acuminate, serrate, thin, slightly scabrous 

 on both sides, paler beneath. Flowers small, few, terminal. 

 Florets of the ray 8 10. There are probably several species of 

 this genus in the N. S. not now credited to it. 



10. H. decapetalus Linn. : leaves ovate, acuminate, remotely serrate, 

 3-nerved, scabrous ; scales of the involucre ovate-lanceolate, nearly 

 equal, somewhat ciliate. H. macrophyllus Willd. Pursh.? 



HAB. Rocky woods. Can. to Car. Aug. Oct. 2_. Stem 3 4 

 feet high, branching. Leaves alternate above, the petioles cili- 

 ate at base. Flowers large, in terminal panicles. 



11. H. multiflorus Linn. : leaves 3-nerved, scabrous, lower ones cor- 

 date ; upper ones ovate ; florets of the ray numerous; scales of the in- 

 volucre lanceolate. 



HAB. Mountain woods. Penn. to Car. July Sept. If. Stem 

 and peduncles scabrous. Scales of the involucre 40 50, loosely 

 imbricated, not squarrose. 



12. H. tulcrosus Linn. : leaves 3-nerved, scabrous; lower ones cor- 

 date-ovate ; upper ones ovate- acuminate ; petioles ciliate. 



HAB. Fields. N. S. July Sept. -If. Root tuberous. Stem 

 4 8 feet high. Naturalized in various parts of the N. S. 



Jerusalem Artichoke. 



37. HELIOPSIS. Pers. 



Involucre imbricate ; scales subovate, nearly equal. Rays 

 large and linear. Receptacle chaffy, conic ; chaff lanceolate. 

 Seeds 4-angled. Pappus none. Syngenesia. Superflua. 



