1462 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



6 to 20 cm. wide, closely beset with stipitate glands; heads 10 to 24-flowered; 

 phyllaries linear, attenuate, purple, gland-dotted. 



Some specimens from Zacuapan in the State of Veracruz (Purpus 7078) appear 

 to be only a much smoother form of this species. 



89. Eupatorium hidalgense Robinson, Contr. Gray Herb. n. ser. 75: 8. 1925. 

 Hidalgo; type from Sierra de Pachuca. 



Shrub 1 to 1.5 meters high; stems and spreading branches terete, dark gray to 

 almost black; branchlets dark purple, crisped-puberulent; leaves opposite, 

 rhombic-oblong, narrowed to an obtuse or rounded tip, subcuneate at base, entire 

 or nearly so, essentially glabrous, green above, pale and dark-punctate beneath, 

 1.5 to 3 cm. long, 1 to 1.5 cm. wide; petiole 2 to 5 mm. long; cor\'mbs terminal, 

 rather dense, flattish to distinctly convex, 3 to 6 cm. wide, often numerous and 

 comVjined into a compound leafy inflorescence; heads 8 to 10 mm. high; phyllaries 

 linear, narrowed to an obtuse tip, green or purple-tinged, not half the length of 

 the florets; corollas white; pappus usually purplish toward the base. 



90. Eupatorium rhomboideum H. B. K. Nov. Gen. & Sp. 4: 127. 1820. 

 Eupatorium calaniinthaefolium /3 pluridentatum DC. Prodr. 5: 171. 1836. 

 Mexico and Federal District; type collected between Tianguillo and Toluca. 

 Shrub 0.9 to 1.5 meters high; stems and ascending branches round; branchlets 



somewhat hexagonal, puberulent; leaves opposite, rhombic-ovate, obtusish, cre- 

 nate except toward the cuneate to obtuse base, puberulent, 3-nerved, 2 to 3 (or 5) 

 cm. long, 1.5 to 2.5 (or 3.5) cm. wide; corymbs multiple or dense, strongly convex 

 to ovoid; heads about 1 cm. high; phyllaries oblong-lanceolate, acute, pubescent; 

 corollas much exserted, purple-tinged. 



91. Eupatorium irrasum Robinson, Contr. Gray Herb. n. ser. 75: 8. 1925. 

 Eupatorium calaminthaejolium var. irrasum Robinson, Contr. Gray. Herb. 



n. ser. 68: 11. 1923. 



Oaxaca and Puebla; type from the Cordillera of Oaxaca. 



A rather densely branched shrub; leaves very small, ovate, obtuse, serrate, con- 

 spicuously discolorous, puberulent and dull green above, canescent-tomentose 

 beneath, only 7 to 10 mm. long and 4 to 7 mm. wide; corymbs numerous, few- 

 headed; phyllaries lance-linear, acute, mostly purple-tinged, densely pubescent; 

 corollas purple. 



92. Eupatorium porriginosum Robinson, Contr. Gray Herb. n. ser. 75: 11. 

 1925. 



Hidalgo, Federal District, and Oaxaca; type from bluffs of a barranca above 

 Metepec Station, Hidalgo. 



Copiously branched, small-leaved shrub 0.9 to 1.5 meters high; stems terete, 

 at length glabrous; branches and branchlets crisped-puberulent; leaves opposite, 

 oval, entire or nearly so, obtuse to rounded at each end, membranaceous, slightly 

 paler beneath, sparingly puberulent and punctate on both surfaces, nearly always 

 slightly mottled on the upper as if obscurelj^ lepidote, 1 to 2 cm. long, 7 to 15 mm. 

 wide; corymbs few-headed, umbelliform, numerous; pedicels 1 to 1.8 cm. long, 

 often exceeding the heads; phyllaries narrowly lanceolate, about half the length 

 of the florets; corollas purple or white. 



93. Eupatorium wrightii A. Gray, PI. Wright. 1: 87. 1852. 

 Kyrstenia parvifolia Greene, Leaflets 1: 12. 1903. 

 Chihuahua, Coahuila, and San Luis Potosi. Texas. 



Much-branched grayish-puberulent or -pulverulent shrub 20 to 60 cm. high; 

 stems terete; cortex gray; leaves opposite, broadly oval, rounded to subacute at 

 apex, mostly rounded at base, entire or nearly so, membranaceous to chartace- 

 ous, the cauline 1.8 to 3 cm. long, nearly as wide, the rameal often very numerous 

 and much smaller; corymbs small but numerous, often forming irregular com- 

 pound inflorescences; heads about 12-flowered; phyllaries lance-oblong, acute,, 

 green; corollas white. 



