Part 2, 1915] CARDUACEAE: HELENIEAE 141 



Doubtful species 



Gaillardia amara Raf. Fl. Ludov. 69. 1817. This is wholly indeterminable, probably 

 not a Gaillardia at all. 



Subtribe 14. FLAVERIANAE. Heads in corymbiform cymes, 1-10- 

 flowered, usually radiate but the rays inconspicuous.- Involucre elliptic or 

 campanulate; bracts 1-8, subtended by 1 or 2 small calyculate ones (or these 

 rarely wanting). Ray-flowers 1-5; ligules small, yellow. Disk-flowers yellow ; 

 corolla-tube glandular, equaling or longer than the campanulate or funnel- 

 form throat. Achenes oblong-ellipsoid, 8-10-ribbed. Pappus squamellate or 

 wanting. 



Ligules 3-5, spreading; pappus of more or less united squamellae or squamellae 



and bristles. 70. Sartwellia. 



Ligule 1, ascending, or wanting; pappus wanting or of 2-4 distinct squamellae. 71. Flaveria. 



70. SARTWELLIA A. Gray, PI. Wright. 1: 122. 1852. 



Slender perennial herbs. Leaves narrowly linear, opposite. Heads radiate, 10-20- 

 flowered, in corymbiform cymes. Involucre campanulate; bracts 5 or 6, oval or elliptic, 

 yellowish. Receptacle glabrous. Ray-flowers 3-5; ligules oval, 5-toothed, spreading, yellow. 

 Disk-flowers 9-15; corolla-tube about equaling the turbinate throat; style-branches short, 

 compressed, truncate. Achenes 10-ribbed, almost cylindric; pappus of erose squamellae 

 wholly united into a crown, or else only united at the base, 5 in number and with 5 alternat- 

 ing bristles. 



Type species, Sartwellia Flaveriae A. Gray. 



Pappus-squamellae wholly united into a fimbriate crown; plant glabrous. 1. 5. Flaveriae. 

 Pappus-squamellae 5, with 5 alternating bristles, united only at the base. 



Plant glabrous; squamellae about 1 mm. long. 2. 5. mexicana. 



Plant puberulent; squamellae about 0.5 mm. long. 3. 5. pubernla. 



1. Sartwellia Flaveriae A. Gray, PI. Wright. 1: 122. 1852. 



An erect perennial herb; stems several, about 3 dm. high, glabrous; leaves narrowly 



linear, 3-5 cm. long, 1 mm. wide or less, glabrous; heads 12-17-flowered; involucre 2.5-3 mm. 



high; bracts 5 or 6, oval, membranous, glabrous; ray-flowers 3-5; ligules oval, 1.5 mm. long, 1 



mm. wide; disk-corollas 2 mm. long; tube glandular-puberulent; achenes 2 mm. long, hispi- 



dulous; pappus-squamellae wholly united into an erose crown, 0.5 mm. long. 



Type locality: Prairies of the Rio Seco, Texas. 

 Distribution: Western Texas, New Mexico. 

 Illustration: A. Gray, PI. Wright. 1: pi. 6. 



2. Sartwellia mexicana A. Gray; (S. Wats. Proc. Am. Acad. 18: 

 107, hyponym. 1882), Proc. Am. Acad. 19: 34. 1884. 



An erect perennial herb; stem 3-4 dm. high, branched above, glabrous; leaves narrowly 

 linear, 3-5 cm. long, less than 1 mm. wide, glabrous; heads about 10-flowered; involucre 

 glabrous, 2 mm. high; bracts 5 or 6, oval; ray-flowers 3-5; ligules oval, 1 mm. long; disk- 

 corollas 2 mm. long; tube glabrous; achenes 1 mm. long, hispidulous on the ribs; pappus of 

 5 oblong erose squamellae, 1 mm. long, and alternating with them 5 hispidulous bristles about 

 half longer, all united at the very base. 



Type locality: Near Monclova and San Lorenzo de Laguna, south of Parras, Coahuila. 

 Distribution: Coahuila and Zacatecas. 



3. Sartwellia puberula Rydberg, sp. nov. 



An erect perennial (?) herb; stem 3 dm. high or more, densely puberulent; leaves nar- 

 rowly linear, about 5 cm. long, 1-1.5 mm. broad, densely puberulent; heads 12-20-flowered; 

 involucre puberulent, scarcely 2 mm. high; bracts 5, elliptic; ray-flowers 3-5; ligules 1-5 

 mm. long; disk-corollas fully 2.5 mm. long; tube puberulent; achenes 1 mm. long, hirsute; 



