1636 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



involucre usually 21, glabrous or slightly puberulent; ray flowers about 15, rays 

 deep orange-colored; disk flowers numerous, 60 or more; achenes puberulent. 



DOUBTFUL SPECIES. 

 Senecio chenopodioides H. B. K. Nov. Gen. & Sp. 4: 179. 1820. This 

 species, which was based on specimens collected at Campeche, Mexico, is of 

 doubtful status. Its relationship, however, is with S. confusus. 



109. GOCHNATIA H. B. K. Nov. Gen. & Sp. 4: 19. pi. 309. 1820. 

 Shrubs; leaves alternate, entire or toothed; heads usually glomerate, discoid; 

 involucre many-seriate, graduate, of indurate phyllaries; corollas all equally 

 5-lobed; achenes pubescent; pappus of numerous stiffish bristles; anthers long- 

 caudate at base. 

 Leaves green and merely puberulous beneath. 



Leaves entire 1. G. arborescens. 



Leaves serrulate 2. Q. glomeriflora. 



Leaves canescent or griseous-tomentose beneath. 



Heads about 18-flowered 3. G. purpusi. 



Heads 4 to 6-flowered. 



Leaves grajish green on both sides, pubescent above 4. G. smithii. 



Leaves bright green and glabrous above (at least at maturity), canesceut- 

 tomentose beneath. 

 Leaves elliptic-lanceolate or elliptic, acute or acutish, 2 to 5 cm. long. 



5. G. hypoleuca. 

 Leaves oval, rounded or obtuse at ape.K, 4.5 to 20 mm. long. 



6. G. obtusata. 



1. Gochnatia arborescens T. S. Brandeg. Zoe 5: 163. 1903. 

 Cape region of Baja California; type from Can6n de Santa Maria. 

 Arborescent, 3 to 4 meters high, the trunk 20 to 30 cm. thick; stem puberulous; 



leaf blades ovate, 3.5 to 6.5 cm. long, 2.5 to 4.5 cm. wide, short-petioled, obtuse; 

 heads thick-cylindric, 1.8 cm. high, 13 to "20 "-flowered, crowded at tips of 

 branches; involucre about 10-seriate, graduate, 1.5 cm. high, the phyllaries 

 stramineous, arachnoid-ciliate, otherwise glabrous. 



2. Gochnatia glomeriflora A. Gray, Proc. Amer. Acad. 19: 57. 1883. 

 Perezia capitata S. Wats. Proc. Amer. Acad. 25: 156. 1890. 



Jalisco and Morelos; type from Cuernavaca, Morelos. 



Suffrutescent (?), about 2.5 meters high; stem glandular-puberulous; leaves 

 subsessile, ovate to suborbicular, 5 to 11 cm. long, 2.5 to 8.8 cm. wide, acute to 

 acuminate, cordate at base, subcoriaceous, venose-reticulate; heads 1.3 cm. high, 

 clustered in the leaf axils, "4" or 5-flowered; phyllaries acuminate. 



3. Gochnatia purpusi T. S. Brandeg. Zoe 5: 240. 1906. 

 Known only from the type locality, Tehuacdn, Puebla. 



Shrub; stem and lower leaf surface (at first also the upper) densely cinereous- 

 tomentose; leaves subsessile, elliptic, 1.8 to 3 cm. long, 5 to 14 mm. wide, crenate- 

 denticulate or subentire, coriaceous; heads in terminal glomerules, about 12 

 mm. high, about 18-flowered; involucre lanate-tomentose. 



4. Gochnatia smithii Robins. & Greenm. Proc. Amer. Acad. 32: 50. 1896. 

 Oaxaca; type from Cuicatlan. 



Shrubby; young branches tomentulose-puberulous; leaves petioled, the blades 

 lanceolate or lance-oblong, about 4 cm. long, 1.2 to 1.8 cm. wide, entire, griseously 

 tomentose-pilose beneath; heads about 13 mm. high, in dense glomerules, 6- 

 flowered; involucre about 7 mm. high, the phyllaries mostly obtuse, ciliolate. 



