258 American Midland Naturalist Monograph No. 2 



17. Antennaria Gaertn. — Everlasting 



1. Rosette leaves comparatively small, usually less than 3 cm. long, 1 -ribbed, 

 or indistinctly 3-ribbed. 



2. Rosette leaves obovate, abruptly contracted below the middle into a petiole- 

 like base; roadsides and open woods. May-June ....A. neodtoica Greene 



2. Rosette leaves cuneate-spatulate, gradually tapering to the sessile base; dry 



soil on open wooded slopes. Apr.-May A. neglecta Greene 



1. Rosette leaves larger, distmctly 3-ribbed, 3-12 cm. long. 



3. Upper surface of leaves dark green and glabrous or nearly so from the 



beginning; dry soil in open woods and on bluffs. Apr.-May 



A. parl'mi'i Fern. 



3. Upper surface of leaves tomentose, tardily glabrate in age. 



4. Heads small, the involucres of the pistillate plants 5-7 mm. high; 



wooded slopes, common. Apr.-May A. plantaginijolia Hook. 



4. Heads larger, the involucres of the pistillate plants 8-10 mm. high. 



5. Rosette leaves rhombic-obovate, widest at or below the middle, usual- 

 ly acutish at the apex; pastures and open woods, common. Apr.- 

 May A. fallax Greene 



5. Rosette leaves spatulate or obovate, widest above the middle, rounded 



at the apex. Cook Co. [A. occidentalis of auth., not Greene} 



A. munda Fern. 



18. Gnaphalium L. — Cudweed 



1. Heads in cymose or paniculate clusters; pappus-bristles not united. 

 2. Stems 30-90 cm. tall, simple below; bracts white; achenes smooth. 



3. Leaves not decurrent; plants not glandular; outer bracts obtuse; fields, 

 roadsides, and open woods, common. Aug. -Oct. Sometimes mistaken 

 for Anaphalis margaritacca (L.) B. & H., which is not known to 



occur in 111. [G. polyccphaluni Michx.} G. obttisifolium L. 



3. Leaves decurrent; stem glandular-pubescent; bracts acute; sandy soil in 



woods and fields, rare. July-Sept G. macounii Greene 



2. Stems 5-25 cm. tall, diffusely branched near the base; bracts brownish; 



achenes scabrous; dried mud, and along ditches, local. June-Aug 



G. iiliginosuni L. 



1. Heads in a narrow spike-like panicle; pappus-bristles united at base, falling 

 away in a ring; leaves glabrate above; fields and open woods, local. May- 

 July G. piirpureum L. 



Tribe 6. Iniileae 



19. Inula L. — Elecampane 



7. helcnmm L. Roadsides, fields, and open woods, occasional; introd. from 

 Eur. July-Aug. 



