14 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Barranca de Consoquitla, Liebmann, no. 108 (hb. Gr.). Guatemala s 

 Valley of Guatemala, Hartweg (hb. Gr.) ; alt. 1550 m,, J. D. Smith, 

 no. 2363 (lib. Gr.) ; Volcan de Fuego, alt. 1550 m., /. I). Smith, no. 

 2856 (hb. Gr.) ; Canizal alt. 1550 m., Heyde Sf Lux, no. 4202 of J. D. 

 Smith's distrib. (hb. Gr.). Yucatan: Merida, Valdez, no. 10; with- 

 out locality, Gaumer, no. 397. Honduras : San Pedro Sula, alt. 250 

 m., Thieme, no. 5236 of J. D. Smith's distrib. (hb. Gr.) ; Gulf of 

 Fonseca, Sinclair (hb. Gr.). Costa Rica : Cartage, Cooper, no. 

 5810 of J. D. Smith's distrib. ; in woods near Terraba, alt. 260 m., 

 Pittier, no. 3705 (hb. Gr.). Panama: Veraguas, Seemann (hb. Gr.). 



16. T. "Wrightii, n. sp. A much-branched shrub ; branchlets sub- 

 appressed-pubescent: leaves lanceolate, 1.5 to 7 cm. long, 0.5 to 2 cm. 

 broad, entire or inconspicuously denticulate, narrowed below into a ses- 

 sile or subsessile base, more or less decurrent on the stem, thickish, 

 appressed-puberulent on both surfaces to essentially glabrous, reticulate- 

 veiny beneath : heads about 1.5 cm. high, loosely disposed in corymbose 

 panicles, 1 1-13-flowered ; bracts of the outer involucre spatulate to obo- 

 vate, 5 to 10 mm. long, 2 to 6 mm. broad ; inner involucre of 8 appressed- 

 pubesceut scales 10 to 11 mm. in length. — Sinaloa : near Mazatlan, 

 January, 1889, W. G. Wright, no. 1224 (hb. Gr.), December, 1894, 

 Lamb, no. 248 (hb. Gr.). Tres Marias Islands : Maria Madre 

 Island, 3 to 25 May, 1897, Nelson, no. 4191 (hb. Gr.). 



III. — REVISION OF THE MEXICAN AND CENTRAL 

 AMERICAN SPECIES OF HIERACIUM. 



B. L. Robinson and J. M. Greenman. 



Through a lack of accurate knowledge of the Mexican Hawk- 

 weeds there has been for many years a tendency to crowd unlike forms 

 into certain of the older and vaguely characterized species. Some years 

 ago the writers made a preliminary revision of the Mexican and Central 

 American species of this genus, but from the uncertainty which still ob- 

 scured the exact application of some of the earlier specific names, it 

 seemed best to withhold the paper from publication pending further in- 

 vestigation. Of late, however, it has been possible to gain considerable 

 new light on the subject, first from numerous specimens, tracings, draw- 

 ings, and authentic fragments obtained by the Gray Herbarium through 

 the purchase of the collection of the late Dr. F. W. Klatt, and second 



