JOHNSTON. — A REVISION OF THE GENUS FLAVERIA. 287 



= = Ligule oval, reflexed. 



a. Leaves lanceolate, bracts 3 (sometimes 4 or 6). 



6. Leaves serrate, inflorescence leafy, not compact; stem glabrous or villous at 



nodes, stout. 



4. P. campestris, rov. sp. Herbaceous : stem erect, branching 

 dichotomously, green or rubescent, glabrous or villous at nodes : leaves 

 linear to lanceolate, serrulate, 3-nerved, narrowing at base, slightly con- 

 nate, 2.5 to 6.5 cm. long, 1 to 2.5 cm. wide : inflorescence densely 

 cymose, cymes corymbose-paniculate, involucral bracts 3 nearly equal, 

 .5 cm. long; outer bracts usually 2 unequal, .1 to .6 cm. long, linear- 

 liinceolate : flowers usually one 9 and 3 to 4 ^ ; corolla tube slightly 

 villous, lamina of 9 large, oval, reflexed, nearly equalling 9 achene, 

 which is .3 cm. long; achene of ^ .25 cm. long. — Missouri: Court- 

 ney,^. F. Busk, 51, Sept. 1890 (hb. U. S.). Kansas: Pawnee Rock, 

 A. Gordon, Sept. 1895 (hb. Engel.) ; Argentine, K. Mackenzie, Sept. 

 1895 (hb. M. B. G.) ; M. A. Carleton, 740, 1896 (hb. Gr., hb. U. S.) ; 

 Belvidere, S. F. Ward, 1897 (hb. Gr., hb. U. S.) ; Wichita, B. B. Smyth, 

 240, 1890, low sandy dunes and flats near river (hb. U. S.) ; Medicine 

 Lodge, Smyth, 292, 1890, low prairies (hb. U. S.). Indian Territory: 

 Cherokee Outlet, Carleton, 505, Sept. 1891 (hb. U. S.). Texas : Mus- 

 tang Spring, V. Havard^ 13 (hb. U. S.); Baylor County, Reverchon, 22, 

 1879 (hb. Gr.) ; banks of the Brazos, Seymour, Reverchon, 506, 1879 

 (hb. J. D. S., lib. U. S.) ; alkali flat, Big Spring, Howard County, V. 

 Havard, 13, Sept. 1881 (hb. Gr.) ; Antelope Hills of the Canadian, 

 Bigelow, 1853-4 (hb. U. S.); Cimarroon Creek, low \)Ta.\v\es, A. Fendler, 

 536 (hb.Gr., hb. Engel.). Colorado: Pueblo, i?. W. Woodward, IS^2 

 (hb. Gr.); Huerfano, G. Fngebnann, Sept. 1881 (hb. Engel.). 



6. b. Leaves remotely denticulate, tapering at base; inflorescence naked, compact; 

 upper stem usually pubescent, stout ; outer bracts large. 



5. F. ANGUSTIFOLIA, Pers. Herb erect, 30 to 90 cm. high, branch- 

 ing dichotomous, upper part puberulent, branching little up to the 

 inflorescence which is coryrabiform or almost umbellate : leaves linear- 

 lanceolate, 2.5 to 11.5 cm. long, 2.2 to 4 cm. wide, obsoletely denticulate 

 or entire, glabrous: inflorescence naked, densely glomerate: bracts usu- 

 ally 3, rarely 4 or 6 ; two outside bracts conspicuous, unequal : 1 9 and 

 3 to 5 5, sometimes 6 to 8 ^ and no 9; corolla tube villous: achenes 

 about equal. — Pers. Syn. ii. 489 (1807). Mllleria angustifoUa, Cav. Ic. 

 Pi. iii. 12, t. 223 (1795). F. integrifolia, Moc. & Sesse, ace. to DC. 

 Prod. V. 635. F. elata, Klatt, Leopold, xxiii. 146 (1887). F. contrayerba, 



