88 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



terminal panicle of elongated racemes bearing the fertile heads on the 



lower part and the sterile heads drooping on short, slender, hispid 



pedicels along the upper part; 



rachis slender, hispid. Fertile 



heads sessile in opposite clusters 



of 6-10, subtended by foliaceous 



hispid bracts. Mature involucre 



(or fruit, shown magnified 5 



diameters in figure) 1.8x3.6-4 



mm., oval-obovoid, bearing a 



stout obtuse beak and 3 or 4 



short acute tubercles, a faint 



transverse ridge below them, 



the fruit glandular-dotted above 



and clothed with long white 



hairs, glabrate or nearly so at 



the base. Achene black, 1.7 x 2 



mm., ovoid-globose, abruptly 



acute; in section triangular, the 



facets convex, glabrous. 



Hab. Cozumel 1885, Gaumer (Oliver); "very abundant at the 

 port of Silam, April," Gaumer 680 ; "prostrate on the sands, always 

 extending itself toward the beach, sometimes 6 meters," northeast 

 point of Cozumel, Millspaugh PL Utowana 1577, coast dunes at 

 Progreso, 



DISTREPTUS Cass. Bull. Soc. Philom., 1817, p. 66. 



Heads homogamous, flowers perfect, fertile, tubular. Involucre 

 oblong, of herbaceous bracts imbricated in 2 series, unequal. Recep- 

 tacle naked, plane. Achene dorsally compressed, 10 ribbed; pappus 



of several unequal awns and 

 scales, the lateral pair of awns 

 longest and twice reflexed. 

 Perennial herbs, heads few 

 flowered, usually aggregated in 

 small glomerules. 



Distreptus spicatus (Juss.) 

 Cass. Bull. Soc. Philom., 

 1817, p. 66. 



Elephantopus spicatus Juss. 

 An erect, branching herb, 

 with terete, striate, sparsely 

 pilose stems and branches, and 

 alternate, sessile, elliptic or 

 linear, dentate or subentire, 

 sparsely pilose leaves. Inflo- 

 rescence of axillary, interrupted 



spikes, 15-25 cm. long, arranged in a leafy panicle. Heads 4 flowered, 

 solitary or 2 or 3 in a sessile narrow glomerule subtended by a pair of 



