BLAKE.— ENCELIA AND RELATED GENERA. 389 
e © Leaves merely puberulent beneath except along the veins; scales gland- 
ular-hispid. 
10. S. Chaseae (Millsp.) Blake, n. comb. Herbaceous, the base 
unknown; stem and branches striate, glandular-hispid particularly 
in the inflorescence; only the lower leaves opposite, thin, ovate-deltoid, 
acute, broadly wedge-shaped at base, crenate-dentate with blunt 
teeth, above granular-scabrous, beneath rather softly puberulent and 
somewhat pilose along the veins, 5-6 cm. long, 3-5.5 em. wide, nar- 
rowed into margined glandular-setose petioles 1.5 cm. or less long, the 
upper sessile and oblong-lanceolate; heads corymbose-paniculate, 
1-1.2 em. high; scales somewhat triseriate, the outer ovate-lanceolate, 
glandular-hispid, shorter than the lance-oblong inner ones which are 
glandular on back and ciliate toward tip; rays sometimes wanting, 
when present 8-10, yellow, elliptic, 4-7 mm. long; disk-corollas 5.5 
mm. long, pubescent, yellow; pales 8-9 mm. long, broad, the margin 
denticulate, green-ribbed, hispidulous on the keel; achenes 6-7 mm. 
long, 3.54 mm. broad, appressed-pubescent and short-ciliate, bearing 
two upwardly ciliate awns about half their length. 
Encelia Chaseae Millsp. in Millsp. & Chase, Field Col. Mus. Pub. 
Bot. iii. 125, pl. (1904). 
Specimens examined: Yucatan: ruins of Kobah, 26 Nov. 1865, 
Schott 911 (ryPE no. 176020, Field Mus.); “herb, 5 feet high, common 
at Izamal, Oct.,” Gaumer 910 (FG); Chichankanab, Gawmer 2045 
(F); San Anselmo, Gawmer 2046 (F). 
++ ++ Involucral scales subequal, or the outer if shorter linear-lanceolate to 
lance-oblong. 
= Leaves ovate or ovate-deltoid, unlobed except in S. foetida, the lobes when 
present broad. 
x Leaves not silky-pubescent beneath. 
° Involucral scales herbaceous throughout, scarcely striate; the usually lobed 
es generally broadly auriculate-clasping at base of petiole; achenes 
small, .5 mm. long. 
ll. S. foetida (Cav.) Blake, n. comb. Annual, erect, often much 
branched, the stem usually purplish, glandular-puberulent and hispid 
with tuberculate-based hairs; lower leaves opposite, the upper often 
alternate, ovate or deltoid, often 3-lobed, particularly the upper, 
crenate-dentate, acute at apex, broadly cuneate or cordate at base, 
hispid with tuberculate-based hairs longer along the veins, the blade 
5-14 cm. long, 3-12 em. wide, the petioles usually margined, often 
broadly so, and generally auriculate-clasping at base; heads numerous, 
_ panicled, the peduncles glandular-hispid; heads 1 cm. high, radiate; 
