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NORTH AMERICAN FLORA 



[Volume 34 



Disk less than 1 cm. broad; leaves entire or denticulate; 

 ligules rather abruptly contracted into a slender base. 

 Leaves narrowly linear-lanceolate, entire or merely denticu- 

 late. 

 Pappus fully half as long as the puberulent disk -corollas and 

 fully twice as long as the tube; plant decidedly pubescent. 

 Ligules more than 1 cm. long; disk-corollas 4 mm. long; 



bracts much exceeding the disk. 

 Ligules 6-10 mm. long; disk-corollas 3 mm. long; bracts 

 only a little exceeding the disk. 

 Ray-flowers neutral. 



Heads corymbose; bracts reflexed. 

 Disk yellow. 

 Disk purplish or dark-brown. 



Wings of the upper part of the stem 1 mm. wide or less; upper 

 stem-leaves much smaller than the basal ones. 

 Receptacle 6-7 mm. high; ligules 25-30 mm. long. 

 Receptacle 2.5-3.5 mm. high; ligules 6-15 mm. long. 

 Wings of the upper part of the stem 2 mm. broad or more; 

 upper leaves not conspicuously smaller. 

 Heads solitary or 2 or 3 on long erect peduncles. 



Receptacle ovate-conic; disk subglobose to hemispheric; bracts 

 soon reflexed. 

 Squamellae dissected halfway down into numerous bristle-like 



divisions; disk about 15 mm. wide. 

 Squamellae obovate, entire or slightly erose; disk 18-20 mm. 

 wide. 

 Receptacle and disk convex to depressed-hemispheric; bracts 

 spreading, tardily recurved. 

 Disk yellow. 



Achenes glabrous or glandular-granuliferous. 

 Leaf -blades entire or undulate. 

 Leaf -blades pinnately lobed. 

 Achenes pubescent on the ribs. 



Basal leaves spatulate or broadly oblanceolate, repand- 



denticulate or entire. 

 Basal leaves narrowly linear-oblanceolate, usually lobed 

 or coarsely dentate. 

 Disk purplish or brown. 



24. H. parviflorum. 

 21. H. antumnale. 



22. H. macranthum. 



23. H. montanum. 



24. H. parviflorum. 



25. H. camp'estre. 



26. H. nudiflorum. 



27. H. polyphyllutn. 



28. H . flmbriatum. 



29. H. Curlisii. 



30. H. Helenium. 



31. H. incisum. 



32. H. vernale. 



33. H. pinnalifidum. 



34. H. brevifolium. 



1. Helenium tenuifolium Nutt. Jour. Acad. Phila. 7: 66. 1834. 



Heleniastrum tenuifolium Kuntze, Rev. Gen. 342. 1891. 



A leafy annual; stem fastigiately branched above, 2-4 dm. high, glabrous or with a few- 

 scattered hairs above; leaves glabrous, linear-filiform, entire, 1-5 cm. long, 1-2 mm. wide, 

 not decurrent; heads corymbose; peduncles slender, 5-7 cm. long; involucre about 1 cm. 

 broad; bracts glabrous, thin, long-attenuate from a lanceolate base; receptacle depressed- 

 hemispheric; ray-flowers 5-10, pistillate; ligules cuneate, 5-10 mm. long, 3-5 mm. wide, 

 deeply 3-lobed; disk globose, about 8 mm. broad; corollas 2.5 mm. long; tube a minute ring; 

 throat deeply campanulate; lobes 5, ovate; achenes about 1 mm. long, hispid on the short 

 angles; squamellae ovate, as long as the achenes, the midrib excurrent into an awn nearly 

 as long. 



Type locality: Mississippi. 



Distribution: Virginia to Kansas, Texas, and Florida; Cuba. 



Illustrations: Meehan, Nat. Fl. 2: pi. 10; Bot. Mag. pi. 7721. 



2. Helenium badium (A. Gray) Greene, Pittonia 5: 55. 1902. 



Helenium tenuifolium badium A. Gray; S. Wats. Proc. Am. Acad. 18: 108. 1883. 



A glabrous leafy annual; stem 2-4 dm. high, branched above; lower leaves 4-5 cm. long, 

 pinnatifid into linear divisions, glabrous; upper leaves linear-filiform; heads corymbose; in- 

 volucre about 1 cm. broad; bracts lanceolate, attenuate; receptacle depressed-hemispheric; 

 ray-flowers pistillate; ligules yellow, pubescent, 4-7 mm. long, 3-5 mm. wide; disk globose, 

 5-8 mm. broad; corollas purplish-brown, 2-2.5 mm. long; tube a minute ring; throat campanu- 

 late; achenes scarcely 1 mm. long, hispid on the angles; squamellae ovate, produced into an 

 awn of nearly the same length. 



Type locality: Bluffton, Texas. 

 Distribution: Texas and Oklahoma. 



