COMPOSITE. 109 



2. M. pubescens Nutt. : stem climbing, pubescent ; leaves Cordate, 

 acuminate, angularly toothed, and with the calyx pubescent ; lobes di- 

 varicate, equal. 



HAB. Low grounds. Penn. to Car. Sept. If. Flowers pale 

 purple, odorous, in paniculate corymbs which are axillary and 

 terminal. Nearly allied to the preceding, 

 i 



32. CACALIA. Linn. 



Involucre cylindric, oblong, the base only somewhat scaly. 

 Receptacle naked. Pappus hairy. Syngenesia. Mqualis. 



1. C. suaveolens Linn. : stem herbaceous ; leaves petiolate, hastate- 

 nagittate, serrate, smooth, similarly coloured on both sides ; flowers 

 corymbed, erect ; involucre many-flowered. 



HAB. Banks of streams. Penn. to Car. Aug., Sept. "U.^Stem 

 34 feet high. Leaves large. Flowers white, with yellow an- 

 thers. According to Mr. Nuttall it is a Senecio. 



2. C. atriplicifolia Linn. : stem herbaceous ; leaves petioled, smooth, 

 glaucous beneath ; radical ones cordate, toothed ; cauline ones rhom- 

 boidal, somewhat toothed on each side ; flowers corymbed, erec.t i in- 

 volucre 5-flowered. 



HAB. Low ground. Can. to Car. Aug., Sept. 2_. Stem 3 6 

 ^ feet high. Peduncles almost white. Flowers nearly white, in a 

 small terminal corymb. 



3. C. reniformis Wllld. : stem herbaceous ; leaves petioled, amooth, 

 hairy on the veins beneath ; radicaj ones broad-cordate, reniform, re- 

 pand-toothed : cauline oblong, toothed, wedgeform and very entire at 

 base ; corymbs fastigiate ; involucre many-flowered. 



HAB! Low grounds. Penn. to Virg. W. to Miss. Aug., Sept. 

 U.-^Stem 58 feet high. Flowers white. 



33. TUSSILAGO. Linn. 



Involucre simple, swelling ; scales equal,- even with the 

 disk and submembranous. Receptacle naked. Pappus sim- 

 ple. (Flotcers mostly polygamous, dioecious.) Fertile 

 florets ligulate or tubular. Syngenesia. Superflua.. 



1." T.frigida Linn. : .scape with a fastigiate many-flowered thyrse ,- 

 flowers radiate ', leaves roundish, unequally toothed, tomentose be- 

 neath. 



HAB. Mountains. Can. and N. S. June. I. Stem 510 

 iches high. Florets of the ray .white j of the disk pale purple. 



2. T. palmata Ait. : scape with a fastigiate thyrse ; flowers obscurely 

 rayed ; leaves roundish-cordate, half 7-lobed, incisely toothed, tomen- 

 tose beneath. 



HAB. Swamps. Fairhaven, Ver. Islands of Lake Huron. Nutt. 

 N. to Labrador, April, May. 14. The leaves of this specie* 



