STANDLEY TEEES AND SHRL^BS OF MEXICO 1517 



Shrub; leaf blades 9 to 13 cm. long, acuminate, cuneate at base, petiolate, 

 villous-tomentose beneath, particularly on the veins; heads about 4 mm. high, 

 in dense glomerules. 



2. Desmanthodium fruticosum Greenm. Proc. Amer. Acad. 40: 37. 1904. 

 Jahsco and Michoacdn or Guerrero; type from Zapotldn, Jalisco. 



Shrubby below, 1.5 meters high; leaves elliptic or ovate, 4 to 9 cm. long, 

 quintuplinerved above the base, sordid-puberulous on the veins beneath; heads 

 tiny, 3 to 4 mm. high. 



3. Desmanthodium perfoliatum Benth. in Hook. Icon. PL 12: 15. pi. 1116. 



1873. 



Flaveria perfoliata Klatt, Leopoldina 23: 146. 1887. 



Oaxaca. 



Shrubby, with herbaceous branches, glaucescent, 3 to 6 meters high; leaves 

 rhombic-lanceolate to obovate, 6 to 12.5 cm. long, penninerved or weakly trip- 

 linerved, glabrous or with a few minute hairs along costa beneath; heads 5 to 7 

 mm. high. 



38. CLIBADIUM Allamand; L. Mant. PI. 161. 1771. 

 Reference: O. E. Schuiz, Beitrage zur Kenntnis der Gattung Clibadium, 

 Bot. Jahrb. Engl. 46: 613-628. 1912. 



Shrubby; leaves opposite, serrate; heads numerous, small, disciform, whitish, 

 cymose-panicled; phyllaries few, dryish; pistillate flowers subtended by pales, 

 their corollas slender-tubular, denticulate; disk flowers hermaphrodite, sterile, 

 without pales (in ours), their corollas 5-toothed; achenes abovoid, obcompressed, 

 epappose. 



Some species of this genus are used in tropical America as fish poisons. 

 Heads 5 to 6 mm. high; phyllaries ciliate, denselj' strigillose at least above 



achenes 2.8 to 3 mm. long 1. C. arboreum. 



Heads 3.5 to 4 mm. high; phyllaries ciliate, otherwise essentially glabrous; 

 achenes 1.8 to 2 mm. long 2. C. pueblanum, 



1. Clibadium arboreum Donn. Smith, Bot. Gaz. 14: 26. 1889. 

 Clibadium asperum Hemsl. Biol. Centr. Amer. Bot. 2: 142. 1881, in part. 



Not C. asperum DC. 1836. 



Clibadium donnell-smithii Coulter, Bot. Gaz. 16: 98. 1891. 



Veracruz. Guatemala; type from Pansamald, Guatemala. 



Shrubby, 3 meters high; stem densely pubescent; leaf blades ovate or broad- 

 ovate, 10 to 23 cm. long, 5 to 19 cm. wide, long-petioled; pistillate flowers 3 to 6, 

 hermaphrodite 9 to 11. 



2. Clibadium pueblanum Blake, Contr. U. S. Nat. Herb. 22: 601. 1924. 

 Known only from the type locality, Pahuatldn, Puebla. 



Similar; leaf blades 10.5 to 14.5 cm. long; pistillate flowers 6 or 7, hermaphro- 

 dite 7 or 8. 



39. GUARDIOLA Cerv.; Humb. & Bonpl. "PL Aequin. 1: 143. pi. 4i. 1808." 



Reference: Robinson, Revision of the genus Guardiola, Bull. Torrey Club 

 26: 232-235. 1899. 



Suffrutescent or herbaceous, with opposite leaves and small, terminal, solitary 

 to cymose-panicled, yellow heads; involucre cylindric to campanulate, of few 

 subequal subherbaceous thin-margined many-nerved phyllaries; rays small, 

 fertile, the disk sterile; achenes columnar or columnar-obovoid, epappose. 

 Phyllaries carinate, about 12 mm. high; leaves deltoid-ovate — 1. Q. carinata. 

 Phyllaries not carinate, 7 to 9 mm. high; leaves narrowly lanceolate. 



Leaves cuneate at base 2. Q. angustifolia. 



Leaves hastate at base 3. G. stenodonta 



