HITCHCOCK — PLANTS OF AMES, IOWA. 499 



LlATRIS CYLINDRACEA, Michx. Fl. 



Prairie ; frequent. 

 L. SCARIOSA, (L.) Willd. Spec. iii. p. \63o. — Ser^-atula seariosa, 

 L Spec. 



Prairie; abundant. 

 L. PYCNOSTACHYA, Michx. Fl, 

 Low prairie; abundant. , 



SOI^IDAGO. 



^. Inflorescence in the axils of feather-veined leaves. 

 S, IjAtifolia, L. Spec. 



Rich woods ; frequent. 



Stem smooth, angled, more or less zigzag; leaves ovate, large and thin, or upper 

 smaller and lanceolate, all tapering into margined petioles, sharply and deeply ser- 

 rate, pubescent beneath. 



* * Inflorescence a terminal panicle. 

 •1- Leaves not triple- ribbed. 

 ++ Racemes not secund. 



S. SPECIOSA, Nutt., var. angustata, Torr. & Gray, Fl. ii. p. 205. 

 Prairie; infrequent. 



Stems strict, 2 to 3 feet high; leaves entire or nearly so, lower spatulate, upper 

 narrowl}' elliptical, becoming small and bract-like in the inflorescence. 



True S. speciosa, Kutt. is abundant in eastern Iowa, but I have not seen it here. 

 It should be sought along the borders of upland woods. 



++ ++ Racemes secund. {S. yietnorolis might be sought here.) 



S. ulmifolia, Muhl. in Willd. Spec. iii. 

 Woods; common. 



Leaves thin, elliptical, pointed at both ends, sharply serrate, or sometimes the 

 upper entire; branches of panicle long, slender and recurving. Qiiite variable. (For 

 note on S. lateriflora, Ait., see Gray, Proc. Amer. Acad. xvii. p. iSo.) 



-!- ■*- Leaves more or less triple-ribbed. 

 ++ Stem smooth, at least up to panicle. 



S. MissouETENSis, Nutt. Jour. Acad. Phil. vii. 183^. 

 Prairie; common. 



Low, seldom more than 3 feet high; glabrous throughout; leaves narrow, thick 

 and rather rigid, entire or sparingly denticulate. Flowering earlier than the other 

 species. 



S. SEROTiNA, Ait. Hort. Kew. 



Open ground or along fences and roadsides; common. 

 Tall, glabrous up to the ample panicle; leaves large and sharply serrate, 



Var. GIGANTEA, (Ait.) Gray, Proc. Amer. Acad. xvii. 18S2. — 

 5. gigantea. Ait. Hort. Kew. 

 Open ground ; not uncommon. 

 Around .North Hull and elsewhere. Leaves'more or less pubescent beneath. 



