90 Phytologia (Aug 2004) 86(2) 



This species superficially resembles the widespread W. scabra but 

 differs in its smaller, herbaceous, habit, softly pubescent foliage, lacerate 

 leaves, etc. 



WEDELIA MEXICANA (Sch.-Bip.) McVaugh, Contr. Univ. Michigan 

 Herb. 9:462. 1972. 



Aspilia mexicana (Sch.-Bip.) Hemsl. 



Wedelia tegetis Strother (in part) 



Wirtgenia mexicana Sch.-Bip. 



Sin and adjacent Dur, pine-oak woodland along hiway 40, talus 

 slopes, 1500-2500; Oct-Nov. 



Perennial herbs 15-30 cm high; stems weakly ascending to 

 procumbent, hirsutulous; leaves opposite throughout, mostly 2-3 cm 

 long, 8-12 mm wide; petioles 5-10 mm long; blades ovate, weakly 3- 

 nervate, roughly hispid above and below, the hairs recurved but not 

 uncinate; the margins serrulate to nearly entire; heads radiate, single 

 and terminal, the peduncles 1-3 cm long; involucres 5-6 mm high, 2-3 

 seriate, the bracts subequal; ray florets 5-8, the ligules 5-8 mm long; 

 achenes 3.0-3.5 mm long, pubescent, the pappus a crown of scales ca 0.5 

 mm high; chromosome number n = 12 pairs {May field 1061 TEX). 



McVaugh (1984) knew this taxon only from the type collection; 

 several additional collections have been examined from the Sin-Dur 

 border (TEX) along highway 40, west of Durango City. Strother (1991) 

 applied the name W. tegetis to all of this material, except for the type of W. 

 mexicana, which he retained as distinct, although its type was probably 

 collected in the same region as his W. tegetis (Turner 1992a,b). Strother 

 also included in his concept of W. tegetis, white-rayed specimens with 

 relatively large heads from n Nay. I include these within my concept of 

 W. grayi. 



WEDELIA PIMANA B. L. Turner, Phytologia 72: 116. 1992. 



Chi, waterfall at Nabogame, grassy areas, 1 800 m; Aug. 



