STANDLEY TREES AND SHRUBS OF MEXICO 1469 



EuPATORiUM POPOCATEPETLENSE, a binomial cited by Hemslej' (Biol. Centr. 

 Amer. Bot. 2: 99) and by him wrongly accredited to Schlechtendal, was an 

 herbarium name used by Schultz-Bipontinus and applied by him to plants 

 which fall into the much earlier E. lucidum Ortega, Hort. Matr. Dec. 35. 1797. 

 Many specimens have been distributed as E. popocatepetlense by Pringle and 

 others which belong to the plant here called E. ligustrinum villiferum Robinson. 

 , EuPATORiuM scABRELLUM Robinson, Proc. Amer. Acad. 35: 339. 1900. 

 Now referred to tlie genus Ophryospoms, where it becomes 0. scabrellus Robinson, 

 Contr. Gray Herb. n. ser. 75: 4. 1925. 



EuPATORiUM TULANUM Klatt, Abh. Naturf. Ges. Halle 15: 323. 1S82. This 

 is Vernonia liatroides DC. Prodr. 5: 34. 1836. 



17. OPHBYOSPORUS Meyen, Reis. Erd. 1: 402. 1834. 

 (Contributed by Dr. B. L. Robinson.) 



References: Baker in Mart. Fl. Bras. 6^: 186. 1876; Robinson, Proc. Amer. 

 Acad. 42: 17-27. 1906. 



Shrubs or herbs with opposite or (in the Mexican species) chiefly alternate, 

 petiolate leaves and numerous small, 4 to 12-fiowered, homogamous heads 

 borne in panicles or corymbs; corollas white; anthers without membranaceous 

 apical appendage though with the connective sometimes shghtly thickened and 

 expanded between the summits of the anther cells; style branches filiform but 

 perceptibly knobbed at tip. 



A chiefly South American genus of about 25 species. 

 Phj'llaries lance-oblong, mostly acutish, about 2-seriate, scarcely imbricate. 



Heads about 3 mm. long, 5 to 8-flowered 1. O. oratifolius. 



Heads 4.5 to 5 mm. long, about 10-flowered 2. O. scabrellus. 



Phyllaries (except the outermost) elliptic, very obtuse to round- 

 ed at tip, about 3-seriate, much imbricate 3. O. petraeus. 



1. Ophryosporus ovatifolius (DC.) Benth. & Hook. f. ; Hemsl. Biol. Centr. 



Amer. Bot. 2: 79. 1881. 



Nothites ovatifolia DC. Prodr. 5: 187. 1836. 



lEupatorium polyhotryum DC. Prodr. 5: 174. 1836. 



Eupatorium microccphalum A. Gray, Proc. Amer. Acad. 21: 384. 1886. 



Eupatorium microphyllum A. Gray; Dur. & Jacks. Ind. Kew. Suppl. 1: 166. 

 1902. Clerical error for E. microcephalum. 



Typical material of this species, early collected by Haenke in Mexico but with- 

 out indication of locality, has never been precisely matched except by specimens 

 collected by Seemann, also without recorded locality. A plant collected by 

 Brandegee near Culiacdn, Sinaloa, though not quite identical, is probably con- 

 specific. 



Suffruticose, softly grayish-puberulent and beset with sessile, yellowish to 

 orange-brown, res-nous globules; stem slender, terete, flexuous; leaves prev.ailingly 

 alternate, short-petioled, ovate, crenate-serrate, acuminate, pinnately nerved 

 from above the base, firmly membranaceous, 5 to 10 cm. long, 3 to 6 cm. wide; 

 petiole 7 to 12 mm. long; heads 3 to 3.5 mm. long, 5 to 8-flowered, subracemose at 

 tips of branches of a leafy-bracted panicle. 



2. Ophryosporus scabrellus Robinson, Contr. Gray Herb. n. ser. 75: 4. 1925. 

 Eupatorium scabrellum Robinson, Proc. Amer. Acad. 35: 339. 1900. 

 Chihuahua; known only from the original collection, secured near Batopilas 



by Goldman. 



Suffruticose, grayish-puberulent and somewhat glandular-atomiferous; leaves 

 alternate, ovate, acuminate, crenate-serrate, the lower as much as 16 cm. long and 

 13 cm. wide, subcordate at base and with petiole 5 cm. in length; heads 4.5 to 

 5 mm. long, about 10-flowered; phyllaries little imbricate, lance-oblong, distinctly 

 narrowed to an acutish tip. 



