1458 CONTRIBUTIOXS FROM THE NATIONAL HERBARIUM 



72. Eupatorium crassirameum Robinson, Proc. Amer. Acad. 35: 332. 1900. 

 Morelos and Veracruz; type from lava fields near Cuernavaca. 

 Soft-wooded tree 3 to 4 meters high with thick, curved, pale grayish, at anthesis 



leafless branchlets; leaves opposite, broadly ovate, coarsely and undulately or 

 sinuately few-toothed or angled, shortly acuminate, thin, green and glabrous on 

 both surfaces, 10 to 16 cm. long, 8 to 14 cm. wide; petiole about 5 cm. long; heads 

 about 15-flowered, in dense rounded compound corymbs; phyllaries linear-oblong, 

 subacute; corollas purple. 

 A species of unique habit. 



73. Eupatorium desquamans Robinson, Proc. Amer. Acad. 35: 333. 1900. 

 Known only from the original collection, made on the Sierra de San Felipe, 



Oaxaca. 



A low much-branched shrub; branches flexuous, nodulose, leafy chiefly at the 

 tip; buds and young leaves covered with a silvery-gray membranous coating, this 

 breaking away and desquamating; leaves opposite, ovate, obtuse or obtusish at 

 both ends, crenulate, paler beneath, 1 to 1.8 cm. long, 8 to 11 mm. wide; petiole 

 3 to 5 mm. long; heads about 15-flowered, in racemiform corymbs; phyllaries 

 linear, acute, purplish brown, densely beset with sessile glands. 



A little known species, probably rare and local. 



74. Eupatorium rupicola Robins. & Greenm. Proc. Amer. Acad. 32: 42. 1896. 

 Oaxaca; the original collection obtained on dry ledges of the Sierra de San 



Felipe. 



Branching hard-wooded shrub 1.5 to 3 meters high; branchlets slender, purple 

 or brown, leafy, covered with a fine dark incurved puberulence; leaves opposite, 

 petiolate, ovate, acuminate, crenate-serrate, rounded at base, green and smoothish 

 above, somewhat paler, very finely dark-reticulate and on the nerves and larger 

 veins pubescent to tomentellous beneath, 25 to 40 mm. long, 16 to 24 mm. wide; 

 petiole 6 to 8 mm. long; corymbs terminal and on short lateral branchlets, together 

 disposed in elongate leafy-bracted panicles; heads about 16-flowered; phyllaries 

 oblong, obtuse, smoothish, not half as long as the florets; corollas purplish white; 

 achenes subsericeous. 



Another well marked and probablj^ very local species, as yet but slightly known. 



75. Eupatorium viburnoides DC. Prodr. 5: 171. 1836. 



Tamaulipas and Nuevo Leon; type from gorges of the valley of Palmilla, be- 

 tween Victoria and Tula. 



Shrub 1 to 2.4 meters high, sparingly arachnoid-tufted on buds, petioles, axils 

 of leaves, etc.; leaves opposite, large, obovate, obtuse to subacute, cuneate at base, 

 few-toothed to entire, coriaceous, on thick short petioles; heads about 15-flowered, 

 in rather dense corymbs; phyllaries linear-oblong, rounded at tip, smoothish; 

 corollas violet (Berlandier) . 



78. Eupatorium tetragonumi Schrad. Ind. Sem. Hort. Gott. 1830; Linnaea 6: 

 Litt. Ber. 72. 1831. 



Known only from material cultivated at Goettingen from seeds said to have 

 been procured by Schiede in Mexico. 



Said to be suffruticose; stem smooth, erect, weak; branches tetragonal, slightly 

 pubescent toward the summit; leaves opposite, rhombic-ovate, acuminate, ser- 

 rate except toward the obtusely pointed base, thinly membranaceous, smoothish 

 above, sparingly pubescent beneath, green on both surfaces, 7 to 11 cm. long, 

 3 to 5.5 cm. wide; petiole 2.5 to 3 cm. long; heads 12 to 15-flowered; phyllaries 

 linear, attenuate; corollas white; pappus scarcely more than half as long as 

 corolla. 



