

NEW PLANTS FROM MISSOURI. 



107 



slender, strongly hooked, glandular-pubescent or glandular 

 short-pubescent below, glabrate above, those near the top 

 of the bur sometimes considerably longer and sometimes 

 considerably shorter than those near the base; body of the 

 bur never concealed by the prickles; beaks stout, about 

 10 mm. long, at maturity abruptly bent at the middle, 

 inflexed and at length greatly overlapping, hooked at the 

 apex. — Sandy bottoms along the Missouri River in west- 

 ern Missouri. Autumn. 



In the sandy bottoms near Courtney, Missouri, Xan- 

 thium glabratum (DC.) Britton, X. commune Britton, 



isylvanicum Wallr., abound, the last 



and X 



Pen 



two species probably freely 



interoradinor 



The 



pe- 



cies above proposed as new is less common than the 

 others, but is the most distinct of all. The leaves are 

 more acuminate and toothed than is common with the 

 other species, while the bur with its long and irregular 

 prickles and inflexed overlapping beaks forming a circle, 

 presents a markedly peculiar aspect. 



Specimens examined. — Missouri: Courtney, Bush 869, 

 September 13, 1900, 1916, October 5, 1903, type, 1804, 

 1806, October 21, 1902. 



Senecio semicordatus Mack. & Bush,isp. nova. 



Senecio aureus Mack. & Bush, Man. Fl. Jacksoii County, Missouri. 

 207, (1902), not of L. 



i 



Perennial, 5 dm. or less tall, growing in small clumps, 

 usually soon very glabrous all over, with the exception of 

 some pubescence along the margins of the lower portions 

 of the radical leaves, rarely a slight pubescence remain- 

 ing elsewhere ; blades of radical leaves ovate-oblong , very 

 obtuse or rounded at the apex, shallowly cordate, semi- 

 cordate or truncate at base but never deeply cordate, veiny, 

 glabrous, crenate-dentate, typically 5 to 7.5 cm. long, 3.5 

 to 4 cm. wide, the petioles 9 to 15 cm. long; stem-leaves 

 oblong-lanceolate, more or less clasping, the lower about 



