124 NORTH AMERICAN FLORA [Volume 34 



mm. broad, yellow or brown; corollas 1.5 mm. long; tube a mere ring; achenes about 1 mm. 

 long; squamellae rounded-ovate, obtuse, nearly half as long as the achenes. 



Type locality: Between Lando and Bexar, "Mexico" [now Texas]. 

 Distribution: Texas and Coahuila. 



7. Helenium amphibolum A. Gray, Proc. Am. Acad. 9: 202. 1874. 



Heleniaslrum amphibolum Kuntze, Rev. Gen. 342. 1891. 



A stout annual; stem 5-8 dm. high, glabrous, angled; lower leaves oblanceolate or oblong, 

 6-10 cm. long, toothed or laciniate-pinnatifid; upper leaves narrowly lanceolate to linear, 

 entire, glabrous; heads corymbose; peduncles 3-5 cm. long; involucral bracts linear-subulate; 

 ray-flowers pistillate ; ligules wholly yellow or with purplish bases, 6-7 mm. long, 4-5 mm. 

 wide; disk 7-10 mm. broad at maturity, fuscous; corollas nearly 2 mm. long; tube a minute 

 ring; throat elongate-campanulate; achenes 1 mm. long; squamellae minute, rounded. 



Type locality: Monterey, "Chihuahua" [Nuevo Leon]. 

 Distribution: Texas to Coahuila and Tamaulipas. 



8. Helenium ooclinium A. Gray, Proc. Am. Acad. 9: 202. 1874. 



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



A freely branching annual; stem 3-6 dm. high, glabrous, angled; leaves lanceolate, often 

 narrowly so, the lower more or less dentate, the upper ones small; heads corymbose; peduncles 

 3-8 cm. long; bracts lance-subulate; ray-flowers pistillate; ligules yellow, 5-10 mm. long, 

 4-6 mm. wide; disk slightly longer than broad, fuscous or brownish-yellow, 8-10 mm. broad; 

 corollas 2 mm. long; tube a mere ring; throat deeply campanulate; achenes fully 1 mm. long, 

 hispid on the angles; squamellae ovate, obtuse, 0.6-0.8 mm. long. 



Type locality: In the Nazas Valley, Bolson de Mapimi, "Chihuahua" [probably Coahuila], 

 Distribution: Texas to San Luis Potosi and Durango. 



9. Helenium Thurberi A. Gray, Proc. Am. Acad. 19: 32. 1883. 



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



A branched annual; stem 5-10 dm. high, puberulent, winged; lower leaves oblanceolate, 

 5-8 cm. long, more or less puberulent, sharply dentate; upper leaves narrowly lanceolate 

 or linear-lanceolate, entire; heads discoid, corymbose; peduncles slender, 5-10 cm. long; 

 involucral bracts lance-subulate, 5-7 mm. long; disk globose or slightly ovoid, 7-8 mm. broad, 

 fuscous; corollas less than 1.5 mm. long; tube minute; throat campanulate; achenes 1 mm. long, 

 hirsute on the angles; squamellae rounded-ovate, obtuse, one-third as long as the corolla. 



Type locality: Southern Arizona. 

 Distribution: Arizona to Chihuahua and Tepic. 



10. Helenium mexicanum H. B. K. Nov. Gen. & Sp. 4: 299. 1820. 



Helenium varium Schrad. Ind. Sem. Goett. 1830: 3. 1830. — Linnaea 6: Litt. 72. 1831. 

 Helenium brachyglossum Ave-Lall.; Rach, Ind. Sem. Hort. Petrop. 1858: 38, as synonym. 1859. 

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



A slender annual; stem 4-7 dm. high, glabrous, slightly winged; leaves linear, 4-6 cm. 

 long, glabrous or sparingly pilose above; heads solitary or 2-4, long-peduncled; peduncles 

 5-15 cm. long; bracts subulate, 5 mm. long; ray-flowers fertile; ligules yellow, 10-14 mm. 

 long, deeply lobed; disk 15-18 mm. broad, yellowish-brown; corollas 3 mm. long; tube very 

 short; achenes 2 mm. long, hirsute on the ribs; squamellae ovate, 1 mm. long, acute or apiculate. 



Type locality: Mexico. 

 Distribution: Southern Mexico. 



11. Helenium puberulum DC. Prodr. 5: 667. 1836. 



Cephalophora decurrens Less. Linnaea 6: 517. 1831. 



Helenium pubescens H. & A. Bot. Beech. Voy. 355. 1838. Not //. pubescens Ait. 1789. 



Helenium californicum Link, Ind. Sem. Hort. Berol. 1840: 21. 1840. 



? Helenium Rosilla Turcz. Bull. Soc. Nat. Mosc. 24': 186. 1841. 



