GREENMAN. — NEW ANGIOSPERMS FROM MEXICO. 93 



Vernonia vernicosa, Klatt, var. comosa. Stem striate, densely- 

 pubescent : leaves pubescent on botb surfaces with subappressed-hirsute 

 hairs, somewhat glabrate above: other characters of the species. — Costa 

 Rica. Buissons a Matamber jn-es Nicoya, January, 1900, Ad. Tonduz, 

 no. 13,607 (hb. Gr., and hb. Inst. Phys.-Geog. Co^t. Ri.). 



Eupatoriastrum, n. gen. of Composites (Ageratece). Heads homog- 

 amous, many-flowered. Involucre campanulate ; bracts 2-3-seriate. 

 Receptacle convex, chaff-bearing throughout. Corollas equal, regular, 

 shallowly 5-toothed. Pappus of numerous minutely barbellate setae, 

 disposed in a single row. Achenes linear-oblong, 5-angled. Leaves 

 opjjosite, petiolate, palmately nerved. Inflorescence in terminal leafy 

 panicles. 



E. Nelsonii. Stem striate, slightly puberulent, somewhat stramineous 

 in color : leaves petiolate, remote, broadly ovate, 1 to 2 dm. or more 

 long, 4 to 16 cm. broad, 5-7-nerved from or just above the base, acute or 

 short-acuininate, denticulate to shallowly dentate, rounded at the base, 

 conspicuously netted-veined, sparingly pubescent with scattered crisp 

 hirsutish hairs on both surfaces; petioles 1 to 3 cm. long: heads 1 to 1.5 

 cm. high, on axillary pedunculate and terminal clusters forming a leafy 

 panicle : involucral scales lance-oblong, acute, externally pubescent : 

 receptacle chaffy throughout with narrow pales slightly broadened toward 

 the tip : corolla a little constricted above the slightly ampliated tube : 

 pappus about equalling the corolla : achenes hirtellous-puberulent along 

 the angles. — Mexico. State of Oaxaca : Santa Efigenia, altitude 150 

 m., 18 July, 1895, E. W. Nelson, no. 2827 (hb. Gr., and hb. U. S. Nat. 

 Mus.). 



In habit and in the character of the paleaceous receptacle this plant 

 resembles Schistocarpha, but the style-branches are distinctly those of the 

 subtribe Ageratece, and closely resemble the style-branches in Eupatorium 

 near which genus it is provisionally placed. 



Stevia collodes. Shrub: ultimate branches reddish, puberulent: 

 leaves linear, or linear-lanceolate, 1.5 to 3.5 cm. long, 1.5 to 3 mm. 

 broad, obtuse, entire, glabrous on both surfaces : inflorescence terminat- 

 ing the stems and branches in few-headed umbellate-cymes : heads about 

 12 mm. liigh : involucral scales linear, 8 to 9 mm. long, acuminate, acute, 

 obtusely keeled on the back and, as well as the leaves and young branches, 

 glandular-viscid : flowers much exceeding the involucre: pappus coroni- 

 form, consisting of minute scales : corolla white, or slightly reddish-tinged, 

 with a long slender glandular tube, and a rather deeply 5-lobed limb: 

 achenes about 4 mm. long, slightly puberulent along the angles. — 



