STANDLEY TREES AND SHRUBS OF MEXICO 1455 



59. Eupatorium ligustrinum DC. Prodr. 5: 181. 1836. 



Eupatorium micranthum Lag. as doubtfully interpreted by Less. Linnaea 5: 

 138. 1830. Probably not E. micranthum Lag. Gen. & Sp. Nov. 25. 1816. 



Eupatorium semialatum Benth. PL Hartw. 76. 1S40. 



Eupatorium myriadenium Schauer, Linnaea 19: 721. 1847. 



Eupatorium iveinmannianum Regel & Koern. Ind. Sem. Hort. Petrop. 1857: 

 41. 1857. 



Eupatorium biceps Ivlotzsch; Vatke, Bot. Zeit. 30: 719. 1872. (A brief paper 

 indicating many horticultural synonyms of this species.) 



Eupatorium popocatapetlense Schlecht.; Hemsl. Biol. Centr. Amer. Bot. 2: 99. 

 1881. 



Eupatorium erythropappum Robinson, Proc. Bost. Soc. Nat. Hist. 31: 248. 

 1904. 



Tamaulipas, San Luis Potosi, Hidalgo, Veracruz, and Chiapas; type from 

 Tamaulipas. Guatemala and Costa Rica. 



Attractive shrub 1.2 to 5 meters high; leaves oblong, acuminate, serrately few- 

 toothed, cuneate and often somewhat crisped and revolute toward the base, 

 feather-veined, thickish-membranaceous, mostly 4 to 9 cm. long and 2 to 4 cm. 

 wide, usually beset beneath with glistening globules; corymbs convex, fastigiate, 

 many-headed; heads 4 to 8-flowered; phj-llaries linear, gland-dotted, scarcely 

 half the length of the florets; corollas white; pappus often deep rose. 



A highly valued greenhouse plant long cultivated under many horticultural 

 names and running into some more or less striking though apparently inconstant 

 forms. Of these the following seems to justify botanical recognition. 

 59a. Eupatorium ligustrinum var. villiferum Robinson, Contr. Gray Herb, 

 n. ser. 75: 10. 1925. 



Coahuila and San Luis Potosi; type from mountains near Carneros Pass. 



Young branches, petioles, etc., spreading-villous as well as finely puberulent; 

 leaves pubescent on both surfaces. 



The leaves in this pubescent form show in venation some transition to the fol- 

 lowing species, being pinnately 5-nerved from above the base rather than regularly 

 pinnate-veined. 



60. Eupatorium saltillense Robinson, Proc. Amer. Acad. 43: 34. 1907. 

 Coahuila and Nuevo Leon; type collection secured at Saltillo. 

 Opposite-branched shrub 0.9 to 1.5 meters high; leaves ovate, obtuse, undulate 



to serrate-dentate, the blade decurrent on the upper part of the petiole and there 

 tending to be revolute and ruffled, sparsely or only obsoletely hirtellous, subcon- 

 colorous, of firmly membranaceous texture, distinctly 3-ribbed from well above the 

 base, punctate beneath, 4 to 6 cm. long, 2 to 4 cm. wide; corymbs many-headed, 

 convex, 4 to 10 cm. wide, puberulent; heads about 5-flowered; corollas white or 

 pink-tinged; pappus roseate. 



Except in its pronouncedly 3-nerved leaves, very close to E. ligustrinum, of 

 which it may prove a mere variety. 



61. Eupatorium hederaefolium A. Gray, Mem. Amer. Acad. n. ser. 4: 65. 

 1849. 



Known only from the type collection, secured at Cosihuiriachi, in the Sierra 

 Madre west of Chihuahua. 



Shrub 1 to 1.3 meters high; branches opposite, terete, ascending, slender; 

 branchlets purple; leaves opposite, long-petioled, reniform-ovate, rounded at 

 tip, coarsely crenate, openly cordate at base, about 4 cm. long and wide, paler 

 beneath, membranaceous; heads 10 to 12-fiowered, in dense terminal sessile 

 corymbs; phyllaries oblong, crisped-puberulent. 

 57020—26 10 



