122 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



lobed. Receptacle convex, becoming conoid; scales oblanceolate, 

 abruptly acuminate, rigid, striate, hispid on the mid-nerve and at the 

 summit. Achene mottled light and dark brown, 1.5 x 3 mm., cuneate; 

 in section lozenge-shape; the truncate summit densely pubescent and 

 bordered by a minute, fimbriate margin; pappus bristles 2-4, .5-2 mm. 

 long, always fallen from the mature achene. 



Hab. Merida, May 30, 1865, Schott 164 {Melanthera hastata 

 Michx. Field Col. Mus. Bot. 1:395); on the beach rifear the Lagoona 

 Colombia, Cozumel, Jan. 7, 1895, Millspaugh Armour Exped. ji, scrub 

 lands about Izamal, Jan. 775 (Amellus aspera Ibid. 1 1323); sunny hills, 

 March n, 1903, C<zc. et Ed. Seler 3928; Cozumel, 1885, 1886; 

 Gaumer (Oliver Amellus aspera Ibid. 1 152) ; "herb, 6 feet high, abundant 

 in old fields, July to March, Izamal, Gaumer 404, Chichankanab 1492, 

 1747, San Anselmo 1748; "open dry ground, center of the Island of 

 Cozumel," Millspaugh PL Utowance 1545, old fields near Progreso, 1723. 



SPILANTHES Jacq. Enun. PI. Carib., 8. 



Heads heterogamous, radiate; rays pistillate, fertile, ligulate; disk 

 flowers perfect, fertile, tubular (or homogamous, rays wanting). 

 Involucre wide campanulate, of subequal bracts imbricated in 2 series. 

 Receptacle convex or elongated, chaffy; scales complicate, loosely 

 enfolding the achenes and deciduous with them. Achenes of ray flow- 

 ers dorsally compressed, 3 angled, of disk flowers laterally compressed; 

 angles ciliate; pappus of 2 or 3 slender awns or bristles or none. 

 Annual herbs with small heads of yellow flowers. 



Achene ciliate on the angles 



hyaline ciliate on the angles 



filipes 

 uliginosa 



Spilanthes uligniosa Swartz, Prod., no. 



A branching perennial with short petioled, oval-oblong, scabrous 



leaves and solitary heads on slender, 

 sparsely pubescent peduncles, 4-7 

 cm. long. Heads in our specimens 

 4 mm. high, 5 mm. broad; rays 

 5-6, disk flowers numerous. In- 

 volucre turbinate, bracts imbricated 

 in 2 series subequal, appressed, 

 ovate, acute, sparsely glandular- 

 pubescent. Rays 2 mm. long, 

 spreading, orange yellow, broadly 

 oblong, 2-3 dentate or subentire; 

 disk flowers orange. Receptacle 

 awl-shaped; scales 2.7 mm. con- 

 duplicate and keeled below, plane 

 at the summit, obtuse, orange 

 tipped, pubescent above, loosely 



clasping the achene and falling with it. Achene black, .7 x 1.3 mm., 

 obovate-oblong ; in section unsymmetrically biconvex, the angles prom- 

 inent; angles with a pale cartilaginous border which dissolves into stiff 

 hairs forming a ciliate margin, a tuft of similar hairs on the sides near the 



