1566 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Shrub; branches sparsely erect-hirsute, glabrate; petioles 5 to 7 mm. long; 

 blades ovate or lanceolate, 6 to 10 cm. long, 1.5 to 3 cm. wide, acuminate, cuneate 

 at base, smoothish above, sparsely strigose on the veins beneath; heads ternate, 

 the pedicels 8 to 22 mm. long; involucre 9 mm. high, the outermost phyllaries 

 lanceolate or lance-ovate, acuminate, the inner broader, obtuse. 



7. Zexmenia fruticosa Rose, Contr. U. S. Nat. Herb. 1: 103. 1891. 

 Known only from the type locality. Alamos, Sonora. 



Shrub 2.5 meters high; branches sparsely strigillose; leaves short-petioled, 

 lanceolate to ovate, 5 to 10 cm. long, 1.4 to 2.8 cm. wide, acuminate, serrate, 

 scabrous, hispid beneath; heads 1 to 5, cymose, the pedicels 1.2 to 5.8 cm. long; 

 involucre 8 to 10 mm. high, the outer phyllaries lanceolate or ovate, acute, 

 strigose, the inner longer, strigillose and ciliate. 



8. Zexmenia frutescena (Mill.) Blake, Contr. Gray Herb. n. ser. 52: 50. 1917. 

 Bidens fruticosa L. Sp. PI. 833. 1753. Not Z exmenia fruticosa Rose, 1891. 

 Verbesina fruticosa L. Sp. PI. ed. 2. 1271. 1763, in part. 



Bidens frutescens Mill. Gard. Diet. ed. 8. Bidens no. 4. 1768. 



Zexmenia costaricensis Benth. in Oerst. Nat. For. Kjobenhavn Vid. Medd. 

 1852: 95. 1852. 



Zexmenia nicaraguensis C. Muell. in Walp. Ann. Hot. 5: 226. 1858. 



Narvalina fruticosa Urban, Symb. Antill. 5: 265. 1907, as to name-bringing 

 synonym only. 



Zexmenia purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 75. 1914. 



Zexmenia frutescens genuina Blake, Contr. Gray Herb. n. ser. 52: 51. 1917. 



Chiapas. Guatemala to Panama; type from "Cartagena." 



Shrubby or "arborescent," up to 8 meters high; branches glabrous or some- 

 what pubescent and glabrate; leaf blades ovate, 6 to 16 cm. long, 2 to 6.5 cm. 

 wide, acuminate, cuneate at base, serrate, rough above, from nearly glabrous to 

 strigose or hispidulous beneath; heads medium-sized, usually numerous in umbel- 

 liform cymes, the pedicels hispidulous, usually 2 to 5 cm. long; involucre 7 to 12 

 mm. high, few-seriate, subequal or somewhat graduate, the phyllaries mostly 

 oblong and obtuse, the outer sometimes ovate and acute or acuminate. " Tisate" 

 (El Salvador) ; "facisc6n" (Guatemala). 



In El Salvador the white ashes derived from the wood are used by spinning 

 women to keep the fingers smooth. In Guatemala the plant is said to furnish 

 a medicine for infantile fevers. The species has been reported from Yucatdn 

 with the name "sactah" or "zactah." 



9. Zexmenia aggregata Blake, Contr. U. S. Nat. Herb. 22: 634. 1924. 

 Known only from the type locality, Santa Catarina, Oaxaca. 



Shrub; branchlets densely spreading-hirsute; petioles 4 to 6 mm. long; blades 

 ovate, 4 to 5.5 cm. long, 1.8 to 2.5 cm. wide, acuminate, cuneate at base, ser- 

 rulate, rough above, rather softh' hirsute-pilose beneath; heads in close umbel- 

 llform C3"mes, the pedicels denselj' spreading-hirsute, 1.4 cm. long or less; involucre 

 9 to 10.5 mm. high, the phyllaries subequal, lance-ovate, hispid-pilose, with 

 acuminate herbaceous tips. 



10. Zexmenia gracilis W. W. Jones, Proc. Amer. Acad. 41: 154. 1905. 

 Colima (type localit30 and Michoacdn or Guerrero. 



Shrub 2 to 3 meters high; branches sparsely strigillose; petioles 1 to 1.5 cm. 

 long; blades lanceolate to ovate, 5 to 11.5 cm. long, 2 to 4 cm. wide, acuminate, 

 at base acuminate to rounded, serrate, sparsely tuberculate-strigose above, 

 sparsely strigillose beneath; heads in terminal umbelliform cymes of 3 to 7, also 

 solitary in the upper axils, the pedicels 1.5 to 8 cm. long, strigillose; involucre 

 7 to 9 mm. high, graduate, the outer and middle phyllaries lanceolate or lance- 

 ovate, with mostly spreading, acuminate, herbaceous tips. 



