JOHNSTON. — A REVISION OF. THE GENUS FLAVERIA. 291 
++ ++ Inflorescence densely corymbose, terminal on long stalks. 
12. F. vacrnata, Rob. & Greenm. Perennial with stout lignescent 
root: stems several, ascending from a decumbent or even prostrate 
somewhat branched base, terete, striate, purplish, with biliniate short 
grayish woolly pubescence, leafy above, naked below except for the per- 
sistent and sheathing bases of the fallen leaves: internodes very short: 
leaves linear-lanceolate, claspiug at the base, very gradually attenuate, 
often fascicled in the axils, 1(—3)-nerved, rather pale green, finely ciliated 
toward the base: heads small, closely aggregated into terminal solitary 
or corymbose-paniculate glomerules ; these simulating the normal involu- 
crate heads of the order: glomerules .12 to .16 cm. in breadth, subtended 
by a few short recurved foliaceous bracts, and containing 380 or more 
heads: involucral scales 3 to 4 in each head, hyaline: ray-flower soli- 
tary, conspicuous, .5 cm. long, with oblong slightly 2 to 3 toothed yellow 
ligule: dise flowers 5 to 7, yellow: style of Q 3-cleft: achenes black, 
lucid, about 10-nerved, 9 2.25 mm. long, ¥ achene 1.75 mm. long. — 
Rob. & Greenm. Proc. Am. Acad. xxxii. 48 (1896). 2. W. Nelson, 1933, 
between Coixlahuaca and Tamazulapam, Oaxaca, alt. 2,000 to 2,500 m. 
Nov. 1894 
* * Heads 10- to 15-flowered. 
+ Leaves linear to lanceolate, slightly connate. 
++ Ligulate flowers not present, inflorescence usually naked. 
13. F. roneiroiia, Gray. Rather stout, 3 to 9 dm. high, pale: 
leaves glabrous, broadest or not narrowed at the closely sessile base, 5 
to 12.5 em, long, entire or with rare spinulose denticulations: heads in 
regular very ample cymes, which are often destitute of leaves. —Gray, 
Pl. Fendl. 88.  Gymnosperma oppositifolia, DC. Prod. v. 312. — 
Mexico: San Luis Potosi, Parry and Palmer, 498, 1878 (bb. Gr., hb. 
Engel., hb. U. S.), also Pringle, 3767, July, 1891 mE Gr.); Parras, 
Coahuila, Palmer, 685, 1880 (hb. Gr., hb. J. D. S., hb. U. S.); Saltillo, 
Coahuila, Palmer, 304, Sept. 1898 (hb. Gr.) ; alas pile 681, 1880 
(hb. Gr., hb. J. D.S., hb. U. S.); Tehuacan, Ziebmann acc. Hemsl. 
l. c.; Berlandier, witout oaeeras (hb. Gr.) ; Cienega Grande, Gregg, 
105, May, 1847 (hb. Engel.) ; Tamaulipas, Jaumam Valley, Z. W. 
Nelson, 4450, June, 1898 (hb. U. S., hb. Gr.). 
++ ++ Ligulate flowers present, inflorescence usually subtending a small whorl 
f es. x 
14. F. floridana, nov. sp. Herbaceous, erect or ascending, branch- 
ing dichotomous, branches often unequal in length, striate, glabrate: 
