APRIL, 1904. PLANTS YUCATAN^ MILLSPAUGH & CHASE. 



9 1 



cate; in section sharply 5 angled, the facets nearly plane: strongly 

 5 nerved, the nerves sparingly weak barbed; pappus of 5 lanceolate, 

 erose-dentate, aristate scales, 

 1.5-1.8 mm. long. 



Hab. Common, Merida, 

 Jan. 4, 1865, Schott 208 (Ager- 

 atum conyzoides Field Col. Mus. 

 Bot. 1:394); Cozumel, 1885, 

 Gaumer (Oliver,* type locality); 

 campo about Izamal, Jan. 13, 

 1895, Millspaugh Armour Exped. 

 72 (Ageratum corymbosum Field 

 Col. Mus. Bot. 1:51); Merida, 

 Valdez 13 {Ageratum conyzoides 

 Ibid. 1:323); open lands, Izamal, 

 Jan. to Dec., Gaumer 395 (Ager- 

 atum corymbosum Ibid.) robust ,, 

 plants with unusually large H/ t 

 leaves 2508, San Anselmo, 1735, 

 Chichankanab, 1736, Izamal, Ccec. et Ed. Seler 3925. 



Called DICIILCHAY "efficacious herb" by the Mayas; "BAKELUS" 

 by Yucatecs; and "FLOR DE SAN JUAN" in Spanish. The herb is 

 )ound upon the temples by the natives to check epistaxis. 



EUPATORIUM L. Sp. PL, 836. 



Heads homogamous, discoid, flowers perfect, fertile, tubular. 

 Involucre oblong, ovoid or campanulate, of numerous membranaceous 

 bracts, imbricated in few to many series, outer gradually shorter. 

 Receptacle naked, plane, convex or conic. Achene 5 angled, little or 

 not at all compressed; pappus of numerous upwardly scabrous bristles 

 in i series. Herbs, shrubs, or small trees; heads few to many flow- 

 ered, disposed in corymbose or cymose panicles. 



Achene with 5 intermediate nerves 

 Achene simply 5 nerved: 

 Base long attenuate 

 Base abruptly attenuate: 

 Achene 2.2 mm. 

 Achene 4-5 mm. 

 Base not attenuate: 

 Pappus persistent 

 Pappus caducous 



albicaule. 

 daleoides 



aromatisans 

 conyzoides 



pycnocephalum 

 Guadalupense 



Lupatorium daleoides (DC.) Hemsl. Biol. Cent. Am. Bot., 2:95. 



Critonia daleoides DC. 



A shrub or small tree with grayish bark, branches terete, smooth; 

 leaves opposite, petioled, elliptic-oblong, acute, serrate or subentire, 

 glabrous, with pubescent veins, dark green and glossy. Inflor- 



*Cited in Supplement to Biol. Cent. Am. by Prof. D. Oliver; this collection of Dr. Gaumer's, 

 made in 1885 and 1886, on Cozumel, Holbox, and Mugeres Islands, is in Kew herbarium; a few 

 specimens also in Herb, gray; Herb. U. S. Natl. Mus.; and Hb. Torrey, N. Y. Bot. Garden. 



