APRIL, 1904. PLANTS YUCATAN^: MILLSPAUGH & CHASE. 



99 



neous, i x 2.2-2.5 mm -, rhomboid-oblong, narrowed at the base; in sec- 

 tion lozenge-shaped; 10 nerved, glabrate when mature, undeveloped 

 achenes usually sparsely pubes- 

 cent; pappus bristles tawny, 

 barbellate, 5 mm. long. 



Hab. Brought to Yucatan 

 by Dr. Gaumer in 1889, now 

 wild all about his enclosures, 

 a perpetual bloomer, Izamal 

 Gaumer 857. {Aster Novi-Belgii 

 L. Field Col. Mus. Bot. 1:323.) 



LEPTILON Raf. Am. Month. 



Mag., 2:268. 



Heads heterogamous, radi- 

 ate, rays pistillate, fertile, ligu- 

 late, inconspicuous, in several 

 series; disk flowers perfect, fertile, tubular. Involucre campanulate, 

 of narrow bracts imbricated in 2-3 series, the outer shorter. Recep- 

 tacle naked, plane. Achene laterally compressed; pappus of numerous 

 fragile bristles in i series. Annual or biennial herbs with small heads, 

 racemose or panicled. 



Leptilon Canadense (L.) Britton & Brown 111. Fl. , 3:391. 

 Erigeron Canadensis L. 



A strict, erect annual, with striate-sulcate stem, sparsely hispid 

 or glabrate, and alternate, sessile, linear, subentire, hispid-ciliate 

 leaves. Inflorescence an elongated panicle; branches and pedicels 

 angled, subsulcate, sparsely pubescent. Heads 5 mm. high, 6-8 mm. 

 broad, about 40 flowered. Involucral bracts linear-lanceolate, acute, 



loose, with spreading tips. Rays 

 white, shorter than the pappus, 

 erect; disk corollas 4 lobed. 

 Achene pale brown, .4 x 1.3 mm. ; 

 oblong, narrowed at the base, 

 rounded at the summit; in sec- 

 tion lozenge-shaped; strongly 

 2 ribbed, somewhat translucent 

 between the ribs, hirsute; pap- 

 pus bristles pale tawny, minutely 

 barbellate, 3 mm. long. 



Hab. Charcas at Celestun, 

 May 12, 1865, Schott 362 {Erig- 

 eron Canadensis L. Field Col. 

 Mus. Bot. i :395); Cozumel, 1885, 

 Gaumer fide Oliver {Erigeron 

 Canadensis L. Ibid. 1:52); fre- 

 quent in waste places about Izamal, 3 feet high, July to Dec., Gaumer 

 846, 1996 {Erigeron Canadensis L. Ibid. 1:323). 



