STANDLEY TREES AND SHEUBS OF MEXICO 1543 



2. Viguiera sphaerocephala (DC.) Hemsl. Biol. Centr. Amer. Bot. 2: 179. 



1881. 



Leighia sphaerocephala DC. Prodr. 5: 582. 1836. 



Encelia squarrosa Greenm. Proc. Amer. Acad. 39: 112. 1903. 



Viguiera squarrosa Blake, Proc. Amer. Acad. 49: 376. 1913. 



Guerrero; type from Mexico, without definite locality. 



Shrub 5 to 7 meters high; branches sordid-tomentose; leaf blades ovate, 9 to 

 10 cm. long, crenate-dentate, pilosulous beneath; heads cymose-panicled, 5 cm. 

 wide; phyllaries oblong, ciliolate and puberulous, the spreading herbaceous tips 

 as long as the indurate body. 



3. Viguiera maculata (T. S. Brandeg.) Blake, Proc. Amer. Acad. 49: 374. 



1913. 



Encelia maculata T. S. Brandeg. Zoe 5: 259. 1908. 



Oaxaca and Puebla; type from San Luis Tultitlanapa, Puebla. 



Shrub; branches appressed-pubescent; leaf blades ovate or lance-ovate, 5 to 

 12 cm. long, harshly lepidote-strigillose above, hispidulous beneath; heads 2.7 to 

 3.5 cm. wide, in cymose panicles of 3 to 8; involucre 6 to 7 mm. high, the phyllaries 

 with abrupt triangular herbaceous tips. 



4. Viguiera eriophora Greenm. Proc. Amer. Acad. 39: 104. 1903. 

 Oaxaca. 



Shrub; branches canescent-tomentose; leaf blades ovate, 7 to 13.5 cm. long, 

 serrate, tuberculate-hispidulous above, hispidulous-pilosulous beneath; heads 

 2.5 to 5 cm. wide, numerous in trichotomous panicles; involucre S to 10 mm. high. 



5. Viguiera quinqueradiata (Cav.) A. Gray in S. Wats. Proc. Amer. Acad. 22: 



426. 1887. 



Helianthus quinque-radiatus Cav. Icon. PI. 3: 36. pi. 272. 1795. 



Leighia ? leptocephala DC. Prodr. 5: 582. 1836. 



Jalisco; type from Mexico, without definite locality. 



Shrub, 3 to 7 meters high; branchlets puberulous; leaf blades ovate, 3 to 15 cm. 

 long, serrulate or serrate, scabrous above, loosely hispidulous-pilosulous beneath; 

 heads about 2 cm. wide, the disk at first 1 cm. high, 3.5 to 5 mm. thick. "Vara 

 blanca" (Duges). 



6. Viguiera gramraatoglossa DC. Prodr. 5: 580. 1836. 



Encelia hypargyrea Robins. & Greenm. Amer. Journ. Sci. III. 50: 155. 1895. 

 Not V. hypargyrea Greenm. 1903. 



Viguiera argyrophylla Blake, Proc. Amer. Acad. 49: 374. 1913. 



Michoacdn, Puebla, and Oaxaca; type from Tlapujahua, Michoacdn. 



Shrubby (?), 1.6 to 5 meters high; stem densely hispid-pilose; leaf blades 4.4 to 

 8 cm. long, greenish above, densely appressed-silky beneath; heads in cymose 

 panicles of 2 to 8, 2.8 to 5 cm. wide; involucre 8 to 10.5 mm. high, hispid-pilose 

 or subsericeous. 



7. Viguiera bombycina Blake, Contr. Gray Herb. n. ser. 54; 71. 1918. 

 Gymnolomia sericea Klatt, Leopoldina 23: 90. 1887. Not Viguiera sericea 



A. Gray, 1883. 



Puebla; type from Mexico, without definite locality. 



Shrubby; stem subsericeous-pilose, subglabrate; leaf blades 2.5 to 5.3 cm. 

 long, entire, dull green or canescent above, densely silky-pilose with appressed 

 hairs beneath; heads 1 to 3, 4.5 cm. wide; involucre 7 to 8 mm. high, silky-pilose. 



8. Viguiera pringlei Robins. & Greenm. Proc. Amer. Acad. 29: 387. 1894. 

 Tepic and Jalisco; type from Zapotldn, Jalisco. 



Shrub up to 3.3 meters high; stem tuberculate-hispid; leaf blades 4 to 7.3 

 cm. long, subsessile, green and harshly lepidote-tuberculate on both sides, strongly 



