ROBINSON AND GREENMAN.— GENUS TRIDAX. T 
Soc. Bot. Fr. xi. 51, t. 1.— Near Sorata, Province of Larecaja, altitude 
2,690 to 3,000 meters, Mandon, no. 289. 
10. T. angustifolia, Benth. & Hook. f. Decumbent and rooting 
at the nodes, pubescent: leaves lance-linear, acute, denticulate or entire: 
involucral scales acutish, pubescent or puberulent on the outer surface ; 
the outer ones inclining to be squarrose : ligules oblong, 2 or 3 lines in 
length. — Gen. ii. 392. — Collected in the Andes of Ecuador by Spruce, 
no. 5582. a 
§ 2. Involucral scales 2-3-seriate, less unequal; the outer often her- 
baceous and acutish. 
* Leaves ovate to linear, pubescent to densely hirsute but not canescent. 
+ Leaves relatively broad, subentire, toothed, or divided into a few rather 
broad lobes. 
++ Pappus longer than or about equalling the achenes. 
= Perennials with ligneous or lignescent base: rays short, nearly orbicular, 
thed. 
ll. T. procumbens, L. More or less densely hirsute with white 
hairs: stems several to many from a woody root or stock, decumbent or 
Procumbent: leaves lanceolate to ovate-lanceolate, acute, sharply repand- 
or sinuate-toothed, cuneate at the base: scales of the involucre oblong, 
acutish, usually villous-hirsute : chaff persistent: rays yellow or (?) white. 
— Spec. ii. 900. Amellus peduinculatus, Ort. fide Willd. Enum. 916. 
Balbisia elongata, Willd. Spec. iii. 2214. B. pedunculata, Hoffmgg. Verz. 
fl. 228. 2B. divaricata, Cass. Ann. Sci. Nat. xxiii. (1831) 90.— The 
ha ti ete ee 
wards, also Pringle, no. 1920; Wartenberg, near Tantoyuca, Ervendberg, 
No. 61; San Luis Potosi, Parry & Palmer, no. 520; Coahuila and 
alisco, Palmer, no. 297; Colima, Palmer, no. 1186; Oaxaca, L. C. 
Smith, no. 423, B. W. Nelson, nos. 2582, 2773; Guatemala, nos. 2870, 
& 4200 of Donnell Smith’s sets. Also on Elliott’s Key, Fla., Simpson, 
ig 5 53; Cuba, Wright, no. 2861. Introduced and now abundant in E. 
and Mauritius. === —SS 
Var. Ovatifolia. Less hirsute, pubescence shorter, finer, and tending 
es become fuscous : base of stem ligneous: leaves ovate, acutish, serrate 
with small subequal obtusish teeth, finely pubescent upon both surfaces, 
8 to 10 lines long, 6 to 8 lines broad, rather abruptly contracted at the 
'4nto short petioles: involucral bracts very broad, mostly obovate. — 
Collecteq by £. W. Nelson in the vicinity of Yalalag, Oaxaca, July, 1894, 
no. 948, Rather well marked in its foliage and possibly a distinct 
Most widely distributed species; Monterey, North Mexico, Haton § Hd- 
Nuevo Leon,” Palmer, nos. 629, 2061 ; Orizaba, Schaffner, Gray, Botteri; 
