Mackenzie and Bush — New Plants from Missouri. 87 



River, Greene County, Trelease, 503, July 28, 1897 ; St. Louis County, 

 Olatfelter, 1895. — IixiNOis: Wady Petra, V. H. CAasc, Sept. 24,1897.— 

 Kansas: Quindaro, Wyandotte County, Mackemie, Z\x\y 11,1897. — Iowa: 

 Iowa City, Eitchcock, 1886. 



Solid AGO longipetiolata n. sp. 



An erect slendertufted perennial, 3-6 dm. high ; stems closely 

 and finely short-canescent, but not whitened ; leaves linear-ob- 

 lanceolate, the lower and those on sterile shoots tapering into a 

 long petiole, the upper sessile or nearly so ; lower leaves (in- 

 cluding petiole) 5-18 cm. long, the upper gradually becoming 

 shorter, 3-11 mm. wide at the widest part, the lower usually 

 short-crenate, the upper entire, green, but appressed-pubescent 

 on both sides, 3-nerved, the mid-nerve prominent, the lateral 

 often obscure ; leaves often bearing small leaves in their axils 

 simulating stipules ; cyme 2.5-7.5 cm. long, rarely 15 cm. 

 long, usually flat-topped and strongly one-sided, either bearing 

 one long curving branch with smaller branches at base, or 

 rarely bearing several curving branches ; heads 5-7.75 mm. 

 high on bracteolate pedicels ; ray flowers 3-9, with rays 2 

 mm. long; disk flowers 8-12; involucral bracts in several 

 rows, appressed, acutish and thickened at the end; achenes 

 strongly pubescent. — Plate XVI. 



Type locality: Lee's Summit, Jackson County, Missouri; 

 collected by K. K. Mackenzie, No. 425, September 19, 1901; 

 type in Herb. K. K. Mackenzie, duplicate in Herb. Missouri 

 Botanical Garden. 



This species is common in rocky woods and barrens from 

 Michigan and Wisconsin through Iowa, Illinois, Missouri, 

 Kansas and Indian Territory to Texas. Distinguished from 

 S. nemoralis Ait. by the very long and narrow, more entire, 

 linear-oblanceolate leaves, its larger heads and longer rays, 

 more imbricated involucre, with sharper scales, lower height, 

 more simple inflorescence and much more pubescent achenes. 



Specimens examined. — Missouri : Type specimens as cited under type 

 locality; Lee's Summit, Jackson County, Bush, 1, Oct. 6, 1883 (marked 

 ''radula'}^''); Monteer, Shannon County, Bush, 11.34, Oct. 23,1901; St. 

 Louis, Engelmann, Aug., 1842 (marked S. nemoralis ?) ; Eagle Rock, Barry 

 County, Bush, 74, Sept. 21, 1896; Martin City, Jackson County, ^ac^-enzie, 

 477, Sept, 18, 1901. — Illinois: American Bottom, Barber's, Engelmann, 

 Aug., 1842; American Bottom, Barber's, Engelmann, Sept., 1843 (marked 



