1422 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



6. Ageratum scabriusculum (Benth.) Hemsl. Biol. Centr. Amer. Bot. 2: 



83. 1881. 

 Coelestina scabriuscula Benth. in Oerst. Nat. For. Kjobenhavn Vid. Medd. 



1852: 72. 1852. 

 Carelia scabriuscula Kuntze, Rev. Gen. PI. 1: 325. 1891. 



Western Mexico (between San Bias and Tepic) to Costa Rica; type from Volcdn 

 El Viejo, Costa Rica. 



Herbaceous or suffruticose, decumbent; leaf blades ovate, 2 to 5 cm. long, 1 to 

 3.5 cm. wide, crenate-serrate, shining above, beneath duller green, sparsely 

 puberulous along the veins; corollas glabrous, bluish; pappus usually dentate. 



7. Ageratum lucidum Robinson, Proc. Amer. Acad. 36: 475. 1901. 

 Morelos; type from Sierra de TopaxtMn, near Cuernavaca. 



Frutescent, up to 50 cm. high; leaf blades ovate, 1.5 to 6 cm. long, 7 to 25 

 mm. wide, obtuse or acute, firm, shining above, beneath light-punctate, sparsely 

 puberulous along the veins; heads broader than high, rather large; corollas white, 

 glandular; pappus subentire. 



8. Ageratum. salicifolium Hemsl. Biol. Centr. Amer. Bot. 2: 83. 1881. 

 Ageratum striclum Hemsl. Biol. Centr. Amer. Bot. 2: 83. 1881. 

 Carelia salicifolia Kuntze, Rev. Gen. PI. 1: 325. 1891. 



Carelia striata Kuntze, Rev. Gen. PI. 1: 325. 1891. 



Jalisco to Morelos; type collected between San Bias and Tepic. 



Herbaceous or fruticose, up to 1.3 meters high; leaves short-petioled, the 

 blades narrowly lanceolate, 4.5 to 11 cm. long, 0.5 to 1.7 cm. wide, attenuate, 

 remotely serrate or subentire, green both sides, beneath sparsely puberulous 

 along the veins and densely dotted with yellowish glands; corollas whitish, 

 glandular-dotted; achenes 1.5 to 2 mm. long. 



8a. Ageratum salicifolium annectens Blake, Contr. U. S. Nat. Herb. 22: 

 588. 1924. 



Known only from the type locality, near Cuernavaca, Morelos. 



Receptacle paleaceous except in center, the pales linear-subulate. 



10. OXYLOBUS Moc; A. Gray, Proc. Amer. Acad. 15: 25. 1879. 



Reference: Robinson, Revision of the genus Oxylobus, Proc. Amer. Acad. 

 49: 483-487. 1913. 



Fruticose or suffrutescent, densely glandular-pubescent; leaves opposite, 

 subcoriaceous, not punctate; heads cymose-panicled; involucre subequal, the 

 phj'llaries subherbaceous, ribbed; receptacle naked; achenes 5-angled; pappus of 

 5 to 10 unequal, deeply lacerate squamellae. 



The genus contains only the following species. 

 Stem leafy throughout. 



Leaves elliptic, entire or subentire, 2 to 10 mm. wide 1. O. arbutifolius. 



Leaves oval or oval-ovate, crenate, 10 to 18 mm. wide. _ 2. O. glanduliferus. 

 Leaves chiefly basal, obovate, those of the stem few and remote. 



3. O. adscendens. 

 1. Oxylobus arbutifolius (H. B. K.) A. Gray, Proc. Amer. Acad. 15: 26. 

 1879. 



Ageratum arbutifolium H. B. K. Nov. Gen. & Sp. 4: 149. 1820. 



Phania arbutifolia DC. Prodr. 5: 115. 1836. 



Phania trinervia DC. Prodr. 5: 115. 1836. 



Oxylobus trinervius Moc; DC. Prodr. 5: 115. 1836, as synonym. 



Carelia arbutifolia Kuntze, Rev. Gen. PI. 1: 325. 1891. 



High mountains, Puebla; type from Mount Nauhcampatepetl or Cofre de 

 Perote, altitude about 3,110 meters. 



