COMPOSITE. 161 



M. scandens Willd. : stem climbing, smooth ; leaves petioled, hastate- 

 cordate, acuminate, repand-toothed ; corymbs panicled, clustered. Eupa- 

 torium scandens Linn. 



Low grounds. Can. to Flor. July Sept. 1\.. Stem 3 6 feet long, branch- 

 ing, striate. Leaves with a somewhat triangular outline. Flowers in numerous 

 compound cymose panicles, purplish- white. M. pubescens Muhl, which is prob- 

 ably only a variety of this species, is confined to the Southern States. 



Common Climbing Hempweed. 



9. NARDOSMIA. D. C. Sweet Colt's-foot. 

 (From the Greek vapSos, spikenard, and 00-^*7, odor.') 



Heads many-flowered, somewhat dioecious. STERILE FL. 

 Flowers of the 'ray in a single series, pistillate, ligulate'; of the 

 disk numerous, perfect but infertile, with the corolla tubular and 

 5-toothed. FERTILE FL. Flowers of the ray in several series, 

 pistillate, mostly ligulate ; those of the disk few. Involucre in 

 a single series. Receptacle flat, naked. Achenia smooth. 



1. N. frigida Hook. : leaves cordate, unequally coarsely and obtusely 

 toothed, somewhat lobed, smooth above, white-tomentose beneath; the 

 lobes divergent at base. Tussilago frigida Pursh. 



Mountain woods. N. H. Ver. and Mass. Aret. Amer. from lat. 66. May. 

 7J.. Scape 5 10 inches high. Heads in a fastigiate thyrse ; rays white ; disk 

 purple. Northern Sweet Colt's-foot. 



2. N. palmata Hook. : leaves reniform or roundish-cordate, palmately 

 5 7-lobed, tomentose beneath ; segments coarsely toothed, often incised or 

 somewhat lobed. Tussilago palmata Ait. 



Swamps. Ver. to Penn. N. to Labrador. W. to Oregon. April, May. %.- 

 Scape 620 inches high, stout, clothed with numerous sheathing scales. Leaves 

 often resembling those of Podophyttum peltatum. Heads in a corymbose thyrse. 



Palmated Sweet Colt's-foot. 



10. TUSSILAGO. Town. Colt's-foot. 

 (From the Latin tussis, a cough ; for the cure of which the plant is esteemed.) 



Heads many-flowered, heterogamous. Flowers of the ray in 

 several series, pistillate ; those of the disk few, staminate, tu- 

 bular, 5-toothed. Receptacle naked. Involucre of one series, 

 the scales oblong-obtuse. Achenia of the ray oblong-cylindric, 

 smooth ; of the disk abortive. Pappus of the ray in many 

 series ; of the disk in a single series, capillary. 



T. Farfara Linn. 



Wet places and low meadows. N. S. March, April. f l\.. Scape 410 

 inches high, clothed with oblong brownish scales. Leaves cordate, angular, 

 toothed, smoothish above, the lower surface and the long petiole white-tomen- 

 tose. Terminal head about three-fourths of an inch in diameter. Introduced 

 and naturalized in several parts of the Northern States. Common CoU's-foot. 





