434 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
10 Tithonia diversifolia (Hemsl.) A. Gray, Proc. Amer. Acad. 19: 5. 1883. 
Mirasolia diversifolia Hemsl. Biol. Centr. Amer. Bot. 2: 168. pl. 47. 1881. 
Urbanisol tagetifolius var. diversifolius Kuntze, Rev. Gen. Pl. 1: 370. 1891. 
Urbanisol tagetifolius var. diversifolius f. grandiflorus Kuntze, Rev. Gen. Pl. 1: 370. 
1891. 
Urbanisol tagetifolius y flavus Kuntze, Rev. Gen. Pl. 1: 371. 1891. 
Tithonia speciosa Klatt, Bull. Soc. Bot. Belg. 811: 203. 1891, excluding name- 
bringing synonym. Not 7’. speciosa Hook. 1866. 
Tithonia triloba Schultz Bip.; Klatt, Bull. Soc. Bot. Belg. 311: 203. 1891, as 
synonym. 
Stout branching perennial, or perhaps shrubby, 3 to 9 meters high; stem striate, 
sparsely hispid-pilose to sordidly pilose-tomentose, in age usually glabrate; leaves 
alternate, the blades 7 to 20 cm. long, 4 to 18.5 cm. wide, ovate or deltoid-ovate, 
unlobed or usually 3 to 5-lobed, acuminate to attenuate, at base cuneate, rounded, 
or subtruncate, then cuneately narrowed into the petiole, crenate-serrate, tripli- 
nerved, green but rather densely tuberculate-hispidulous with at length deciduous 
hairs above, beneath paler green or subcanescent, everywhere, but particularly along 
the veins, pilosulous or pilose with rather soft hairs and gland-dotted; petioles 
narrowly margined nearly to base, there biauriculate, 2 to 10 cm. long; heads 6 to 
14 cm. wide, on fistulose, striate, sparsely hispid-pilose or subglabrous peduncles 
27 cm. long or less; disk 1.5 to 2.3 cm. high, 1.5 to 4 cm. wide; involucre 4-seriate, 
strongly graduated, 2 cm. high or less, the phyllaries broadly oval, or the outer lance- 
ovate or oval-ovate, broadly round-tipped or the outer acutish or acute, sparsely 
appressed-hispid-pilose or subglabrous, the outermost indurate and vittate nearly 
throughout, with short subherbaceous apex and narrow scarious margin, the inner- 
most with ampliate and elongate submembranaceous apex, all appressed or the inner 
somewhat loose at apex; rays 12 to 14, golden-yellow, elliptic, tridenticulate, 6 cm, 
long or less; disk corollas hispidulous below, 7.5 to 8 mm. long (tube 0.5 to 0.8 mm.); 
pales stiff, abruptly pointed, sparsely hispidulous above, 9 to 11.5 mm. long; achenes 
appressed-pilose, 4.5 to 5.6 mm. long; awns 2, unequal, 2.8 to 4 mm. long; squamellae 
6 to 10, connate below, lacerate at apex, 1.5 to 2.5 mm. long. 
Tyre tocatity: Valley of Orizaba, Veracruz. The species was based by Hemsley 
on Bourgeau 2319, from the Valley of Orizaba; Bourgeau 1562, from the Valley of 
Cérdoba; and plants collected by Fraser and Salvin at Duefias, Guatemala. Of these 
the first is here selected as type. 
ILLustration: Hemsl. Biol. Centr. Amer. Bot. pl. 47. 
SPECIMENS EXAMINED: 
Veracruz: Orizaba, Bottert 483 (G). Valley of Orizaba, May 12, 1866, 
Bourgeau 2319 (type collection; G, K, N). Orizaba, altitude 1,220 meters, 
1891, Seaton 462 (G, N). Valley of Cérdoba, 1865, Bourgeau 1562 (G, K). 
Mirador, Liebmann 603 (sketch, G). Atoyac, 1882, Kerber 161 (N). 
Micuoacdn or GUERRERO: El Ocote, Cerro Pedregoso, 1898, Langlassé 528 
(G, N). 
Oaxaca: Sierra de Clavellinas, altitude 2,590 meters, 1894, Pringle 5806 (G). 
Yucatan: Mérida, 1896, Valdez 93 (G). Without definite locality, Gaumer 
944 (N). 
GUATEMALA: Cubilquitz, altitude 350 meters, 1902, Tiirckheim 8235 (G, N). 
Bank of Cahabén River, between Cajval and Chimaste, altitude 200 meters, 
1905, Ptttier 223 (N). Cob&n, 1907, Tiirckheim II. 1589 (N). Gual&n, 1912, 
Mrs. W. P. Cockerell 50 (N). Guatemala City, 1890, J. D. Smith 2371 
(G, N). Las Cruces, Department of Santa Rosa, altitude 1,830 meters, 
Heyde & Lux 6166 (G, N). Antigua, 1915, Holway 65 (G). San Antonio, 
1916, Holway 526 (G). San Felipe, 1917, Holway 701 (G). Volc4n Fuego, 
1873, Salvin & Godman (K), 
