88 Phytologia (Aug 2004) 86(2) 



eChi, Coa, Nue, Tam, San, Que, Hid, Mex and adjacent U.S.A., dry 

 calcareous hills, and rocky slopes 300-2000 m; Apr-Sep. 



Much resembling W. scabra but the plants more branched from the 

 base and the leaves mostly smaller, narrower and lacking the minute 

 uncinate hairs on the undersurface which distinguish that species; the 

 heads are also borne singly on very elongate peduncles (mostly 15-30 

 cm long); chromosome number, n = ca 26 pairs. 



Strother (1991) considered this taxon to be a variety of his W. 

 acapulcensis (= W. scabra in the present account) but it appears to be 

 amply distinct, at least I discern no intergradation of the characters which 

 distinguish between these. Wedelia hispida superficially resembles W. 

 chihuahuana of w Chi but the former is readily distinguished by its 

 coarsely and evenly pubescent leaves and larger solitary heads. 



WEDELIA INERS (Blake) Strother, Syst. Bot. 33: 72. 1991. 

 Zexmenia iners Blake 



Cps, e Oax?, and Guatemala southwards, tropical forests, often 

 weedy along streams and wet thickets, 50-900 m; all seasons. 



Erect annuals to 60 cm high, the stems arising from rather delicate 

 well-defined tap-roots; leaves mostly 3-11 cm long, 1-4 cm wide; 

 petioles 0.5-1.5 cm long; blades broadly ovate to lanceolate; ray florets 

 5, pistillate, fertile, the ligules white to pale yellow, mostly 1-4 mm long; 

 chromosome numbers, n = 11, ca 22 pairs (Strother, 1991). 



A very distinct taxon, having the vestiture of W. scabra but readily 

 distinguished by its annual habit and heads with small ray florets. 



WEDELIA JUXTLAHUACANA B. L. Turner, sp. nov. 



Similis Wedeliae hintoniorum B. L. Turner, sed radii lutei sunt (vice 

 alborum aut salmoneorum), et folia ovalia sunt (latissima prope medium 

 vice oblanceolatorum vel linearium-oblanceolatorum, latissimorum 

 super medium). 



