1442 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Leaves 6 to 10 cm. long, acute to rounded at base, 

 arachnoid-tufted in axils of veins beneath. 



85. E. mairetianum. 

 Leaves 3 to 4.5 cm. long, truncate to cordate at base, 



not arachnoid-tufted 113. E. pringlei. 



Inflorescence a flattish to moderately convex corymb. 

 Heads 20 to 40-fiowered; phyllaries 0.5 to 1.2 mm. 

 wide; pappus simple. 

 Phyllaries 4 to 5 mm. long, scarcely half length of 

 mature florets, deep purple. 



86. E. subpenninerviuni. 

 Phyllaries 6 to 8 mm. long, decidedly more than 

 half as long as mature florets, acutish to 

 attenuate. 

 Pubescence pale to whitish, that on the inflores- 

 cence gland-tipped; phyllaries pale green, 

 hispid with white hairs, not dark-dotted. 



87. E. vernale. 

 Pubescence purple, fading to rusty, that on in- 

 florescence gland-tipped; phyllaries dark 

 purple and dotted with dark sessile glands. 

 88. E. chiapense. 

 Heads about 60-flowered; phyllaries 1.5 to 1.8 mm. 



wide; pappus double 114. E. chapalense. 



AA. Receptacle hairy. Section Hebeclinium. 



Leaves lance-linear to narrowly ovate or oblong, not half as wide as long, 

 pinnate-veined. 

 Heads about 8 mm. high; corymbs rather dense, 4 to 5 cm. wide; leaves 

 glabrous, attenuate, remotely cuspidate-denticulate. 



115. E. tuerckheimii. 

 Heads 10 to 12 mm. high; corymbs lax, 8 to 12 cm. wide; leaves grayish- 

 puberulent on both surfaces, closely serrulate-denticulate. 



116. E. ehrenbergii. 

 Leaves ovate, more than half as wide as long, palmately nerved. 



117. E. perornatum. 

 1. Eupatorium sagittatum A. Gray, PI. Wright. 1: 88. 1852. 



Sonora and Sinaloa; type, though said to be from California, presumably 

 from coastal Sonora. 



Slender-stemmed, intricately branched shrub, 1 to 2 meters high; leaves 

 petiolate, lanceolate or ovate, sagittate, tomentellous on both surfaces, mostly 

 2 to 3 cm. long and half as wide; heads about 35-flowered, 1 cm. long, on some- 

 what clavate pedicels in open corymbs; corollas lilac. 



la. Eupatorium sagittatum var. deltophyllum Robinson, Proc. Amer. 

 Acad. 42: 45. 1906. 

 Sinaloa; type from Culiacdn. 



Leaves much broader, deltoid, sometimes wider than long. Otherwise like 

 the typical form. 



2. Eupatorium pulchellum H. B. K. Nov. Gen. & Sp. 4: 119. pi. 345. 1820. 

 Chihuahua to Puebla and Jalisco; type from shore of Lake Tezcuco, State of 

 Mexico. 



Scarcely woody, upright, leafy-stemmed, simple to the corymbose inflorescence, 

 0.6 to 1.5 meters high; leaves alternate, oblong-lanceolate to ovate, serrate, 

 3-nerved from near the base; heads verj^ numerous in a dense, round-topped or 

 flattish, compound panicle; corollas purple. 



