NEW SPECIE9 OF PLANTS. 121 



0. Stevia *callosa, annua; foliis linearibus confer- 

 tis crassiusculis, apice callosis, superioribus alternis ; 

 floribus divaricatis subcorymbosis ; pappus subocto- 

 phyllus erosus brevissimus. 



Habitat. On the gravelly banks of the Arkansa; 

 rare. — Flowering from September to October. 



Observations. Annual. Somewhat scabrous ; 

 stem divaricately branched, brittle. Leaves mostly 

 alternate, sessile, and somewhat succulent, constantly 

 terminating in a yellowish sphacelous or callous point. 

 Peduncles and flowering branchlets glandularly pu- 

 bescent ; the flowers reddish and dispersed, tending, 

 however, to a corymb ; the calix cylindric, consisting 

 of about 8 linear leaflets disposed in a single series. 

 Florets from 10 to 12? quite similar to those of Mar- 

 shallia and Hymenopappus, bearing a slender tube 

 and a funnel formed five-cleft border. Anthers 



Habitat. On the summits of hills, on the plains of 

 Red River and the Missouri. 



Observations. This species which is low, pe- 

 rennial and suffruticose, is remarkable in the structure 

 of the calix, the shortness and peculiar disposition 

 of the stamina, and the almost undivided stigma, in 

 all which characters it approaches the genus Epilo- 

 bium, its flowers also expand in the morning in 

 place of the evening. The present variety produces a 

 stigma which is nearly black ; and a stem consider- 

 ably branched. It continues to flower nearly through- 

 out the summer, experiencing only a temporary ces- 

 sation of vigor in the month of August. 



Cultivated Locality. — The garden of the Univer 

 sity of Pennsylvania. 



1S 



