JONES. — A REVISION OF THE GENUS ZEXMENIA. 153 
b. Bracts of the involucre subequal or the outer longest, in few series. 
1. Outer bracts the longest, not foliaceous. 
16. Z.crocea, Gray. Much-branched shrub: leaves oblong-ovate, 
subcordate, acuminate, short-petiolate, serrulate, reticulate-veiny, scab- 
rous above, pilose beneath: peduncles often 12 cm. long, generally 
thickened upward, hirsute, terminal and solitary or in a cyme of 3; 
heads 1 to 2 cm. high; involucre 10 to 15 mm, broad, 2-seriate; outer 
bracts oblong-ovate to obovate or spatulate, acute or obtuse, strigose to 
densely hirsute, much longer than the inner: ligules orange-yellow, 
little or not at all exceeding the disk; disk-corollas with long slender 
tubes: achenes of the ray-flowers usually with 1 long awn and 2 short 
teeth ; achenes of the disk-flowers about 5 mm. long, 1 to 2 mm. wide, 
their awns unequal and shorter than the body. — Pl. Wright. i. 114 
(1852); Hemsl. Biol. Cent-Am. Bot. ii. 172; Seemann, Bot. Voy. 
Herald, 305. Z. Stenantha, Hemsl. 1. c. 174 (1881). — Mexico. Spec- 
imens examined, — Moretos: near Cuernavaca, Pringle, no. 6187 ; 
near Yautepec, Pringle, no. 8701; Bourgeau, no. 1204. Oaxaca: 
Huajuapam, Welson, no. 1978. 
17. Z. Savinu, Hemsl. Shrub, diffusely branched, with large leaves 
and marked pubescence: leaves broadly-ovate, shortly petiolate, acute or 
acuminate, serrate, scabrous above, pilose beneath : peduncles about 1 to 
2 cm. long, pilose, bearing a few small bracteal leaves and a solitary 
head; heads few, 10 to 15 mm. high; involucre about 1 cm. broad; 
bracts apparently decussate, the outer 4 strigose, ovate-oblong or spatu- 
late, brownish: ligules conspicuous, yellow, exceeding the disk and 
involucre: achenes of the ray-flowers 3-angled, with 3 stout awl-shaped 
awns, those of the disk-flowers 2-angled, cuneate, 4 mm. long, with 
2 awns.— Biol. Cent.-Am. Bot. ii. 173 (1881).— Central America. 
Specimens examined, —GuateMaLa: Santa Rosa, Heyde $ Lux, nos. 
3358 and 3797 of J. D. Smith’s distrib. 
2. Outer bracts of the involucre not longer than the inner. 
18. Z. rruticosa, Rose. Diffusely branched shrub: leaves lanceo- 
late or ovate, obtuse to subcordate at the base, acute or acuminate at the 
apex, serrate, scabrous above, hispid-pubescent beneath, sessile or shortly 
petioled: peduncles slender, 2 to 4 em. long, somewhat exceeding the 
upper leaves, chiefly terminal, solitary or in cymes of 3; heads about 
1 cm. high; involucre campanulate, 2~3-seriate, 5 to 7 mm. broad; outer 
bracts lax, ovate or lanceolate, hispid, ciliate, acute, somewhat shorter 
than the inner: ray-flowers 5 to 10; ligules lemon-yellow, surpassing 
