102 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



in section oblong in outline, 5 or 6 angled, the lateral facets con- 

 cave; 5 or 6 nerved, hirsute on the pale nerves, resin dots between 



them; pappus bristles 10-15, 

 fragile, tawny or purplish, nearly 

 smooth, 3 mm. long. 



Hab. "Herb 6 feet high, 

 old fields about Izamal, uncom- 

 mon, October." Gaunter 1002 

 (Pluchea purpurascens Field Col. 

 Mus. Bot. 1:396) "abundant at 

 Chulubmay, March," Jropp, Silam 

 2127, 2412, Chichankanab 2175, 

 2453; near the Caleta, Cozumel, 

 Millspaugh PL Utowance 1532, 

 borders of the lagoons, south of 

 Progreso, 1714. 



Pluchea odorata (L.) Cass. 



Diet. Sci. Nat., 13:3. 

 Conyza odorala L. 



An erect herb, with fruticose base, subangled, softly pubescent 

 stem and branches and alternate, petioled, lanceolate, entire leaves, 

 attenuate at both ends, puberulent above, paler and downy-pubescent 

 below, odorous when crushed. Inflorescence a broad, congested, 

 compound corymb of cymose clusters of 10-20 heads; branchlets and 

 pedicels glandular-tomentose. Heads 6-7 mm. high, 9-10 mm. broad, 

 many flowered. Involucral bracts in 4 series, olivaceous, the outer 

 ovate, obtuse or subacute, glandular puberulent, ciliolate, inner linear- 

 lanceolate, acuminate, the tips erect or spreading, slightly exceeding 

 the pappus. Corollas pale rose color. Achene reddish chestnut, 

 .2 x .9 mm., oblong, narrowed at 

 the base, little oblique; in sec- 

 tion cuneate-5-angled ; faintly 

 5 nerved, hirsute on the nerves, 

 glabrous between them; pappus 

 bristles 10-15, white, minutely 

 barbellate, 3.5-4 mm. long. 



Hab. Merida, Feb. 12, 

 1865, Schott 185, salt swamps at 

 Sisal, Nov. 9, 1865, i; Island 



of Mugeres 1886, Gaumer (Oli- 



ver); streets of Izamal, Jan. 23, 



1895. Millspaugh Armour Ex- 



fed. 176; Merida, Valdez 6; 



Izamal, Gaunter jpp, Pocoboch 



1742, 2343, Calotmul 1743, the 



Caleta, Cozumel, Millspaugh PI. 



Utowana, rfoj, 1512; Ticul, March 6, 1903, Ctzc. et Ed. Seler 3912, 



and Mani March 7, 3914. 



A common shrub, flowering throughout the year, known in Yuca- 



