STANDLEY TREES AND SHRUBS OF MEXICO 1541 



Veracruz to Oaxaca and Yucatdn; type from Valley of Orizaba, Veracruz. 

 Guatemala to Costa Rica; established in Ceylon and India. 



Stout perennial herb, or perhaps shrubby, 3 to 9 meters high; stem hispid- 

 pilose to sordidly pilose-tomentose, glabrate; leaf blades ovate or deltoid-ovate, 

 7 to 20 cm. long, green above, paler or subcanescent beneath; heads 6 to 14 cm. 

 wide; pappus of 2 awns and several squamellae. "Jalacate," "guasmara," 

 ''mirasol" (El Salvador). 



2a. Tithonia diversifolia glabriuscula Blake, Contr. U. S. Nat. Herb. 20: 

 435. 1921. 

 Veracruz and Oaxaca; type from Tuxtepec, Oaxaca. 

 Stem essentially glabrous; leaves very sparsely pubescent beneath. 

 3. Tithonia scaberrima Benth. in Oerst. Nat. For. Kjobenhavn Vid. Medd. 

 1852: 91. 1852. 

 Tithonia platylepis Schultz Bip.; Benth. & Hook. Gen. PI. 2: 368. 1873, as 



synonym. 

 Mirasolia scaberrima Benth. & Hook.; Hemsl. Biol. Centr. Amer. Bot. 2: 



168. 1881. 

 Gymnolomia platylepis A. Gray, Proc. Amer. Acad. 19: 5. 1883. 

 Gymnolomia decurrens Klatt, Leopoldina 23: 90. 1889. 

 Perimeniopsis perfoUata Schultz Bip.; Klatt, Leopoldina 23: 90. 1889, as 



synonym. 

 Tithonia glaberrima Kuntze, Rev. Gen. PL 1: 371. 1891. 

 Gymnolomia scaberrima Greenm. Field Mus. Bot. 2: 268. 1907. 

 Veracruz to Chiapas. Guatemala to Costa Rica; type from vicinity of 

 Chinotega, Segovia, Nicaragua. 



Herbaceous or suffrutescent, 1.3 to 5 meters high; stem densely spreading- 

 pilose or hispid-pilose, or sometimes incurved-hispid; leaf blades ovate or lance- 

 ovate, 8.5 to 17 cm. long, 2.5 to 9.8 cm. wide, acuminate, scabrous above, pale 

 or canescent beneath with dense spreading hairs; heads 5 to 7 cm. wide; phyl- 

 laries broadly rounded; pappus none. "Pulagaste," "mirasol" (El Salvador). 

 In El Salvador the leaves are used in baths for fevers and colds. 



61. VIGUIERA H. B. K. Nov. Gen. & Sp. 4: 224. pi. 379. 1820. 

 Reference: Blake, A revision of the genus Viguiera, Contr. Gray Herb. n. 

 ser. 54: 1-205. pi. 1-3. 1918. 



Herbs or shrubs; leaves opposite, at least below; heads small to large, yellow 

 (in our species), radiate; involucre 2 to 7-seriate, graduate or subequal, the 

 phyllaries usually with indurate base and herbaceous tip; rays neutral; achenes 

 thickened; pappus persistent, of 2 awns and several free or united squamellae, or 

 wanting. 

 Leaves pinnatilobate. 



Leaf lobes attenuate 19- V. stenoloba. 



Leaf lobes blunt (the terminal one sometimes acute) . 



Leaves densely and softly tomentose beneath 17. V. zaluzanioides. 



■ Leaves not densely tomentose beneath. 



Leaves several-lobed, subcanescent beneath 16. V. pinnatilobata. 



Leaves hastately 3-lobed, scarcely subcanescent beneath. 



18. V. tripartita. 



Leaves entire to laciniate. 



Leaves small (the blades 0.7 to 2.5 cm. long), canescent at least beneath; 

 heads solitary. 

 Pappus none; achene glabrous 22. V. greggii. 



