BLAKE—REVISION OF TITHONIA. 431 
hairs and finely hispidulous and gland-dotted; leaves opposite, at least below, usually 
alternate above, the blades 8.5 to 15.5 cm. long, 8 to 16 mm. wide, linear-lanceolate 
to narrowly lance-ovate, long-acuminate, at base slightly broadened and cordate- 
auriculate, obscurely and remotely denticulate, penninerved, rather sparsely hispid- 
pilose and hispidulous with incurved tuberculate-based hairs on both sides and gland- 
dotted, slightly paler below; petioles hispid-pilose, 2 mm. long, or obsolete; peduncles 
naked, slightly fistulose, striate, pubescent like the stem, 8 to 12 cm. long; heads 
3.8 to 6 cm. wide; disk 1.2 cm. high, 1.8 to 2.1 cm, thick; involucre 3-seriate, 7.5 to 
9 mm. high, the two outer series of phyllaries slightly graduated, lanceolate to oblong, 
acutish to acuminate, tuberculate-hispid-pilose, toward tip tuberculate-hispidulous, 
with indurate, ribbed, and vittate base and shorter loose herbaceous apex, the inner- 
most shorter, oblong, indurate to the short deltoid acute mucronulate subherbaceous 
tip; rays about 15, oval-oblong, emarginate, gland-dotted and finely hispidulous 
dorsally, 1.4 to 2.4 cm. long, 4 to 6.5 mm. wide; disk corollas pilose or puberulous at 
base of throat, hispidulous on the teeth, 5 mm. long (tube 0.3 mm.); pales ribbed, 
abruptly short-pointed, tuberculate-hispidulous above, about 8 mm. long; achenes 
plump, obscurely quadrangular, blackish, glabrous, 3.5 mm. long; pappus none. 
Type Locauity; Cerro Colorado, Cofradia, Sinaloa. 
SPECIMENS EXAMINED: 
Stnatoa: Cerro Colorado, Cofradia, November 5, 1904, Brandegee (type collec- 
tion; G, N). Openings in woods, road to La Tigre, San Ignacio, 1918, 
Salazar 446 (N). 
Tithonia auriculata is easily recognized by its narrowly linear-lanceolate or lance- 
ovate, subsessile, auriculate-based leaves. It is perhaps most closely related to 
T. calva laneifolia. 
7. Tithonia pittieri (Greenm.) Blake, Contr. Gray Herb. n. ser. 54: 9. 1918. 
Gymnolomia pittiert Greenm. Proc. Amer. Acad. 39: 101. 1903. 
Herbaceous, the base not seen; stem slender or stoutish, branched, striatulate, 
hispid-pilose with short incurved or ascending hairs with slightly enlarged bases 
and more or less finely hispidulous; leaves opposite below, alternate above, the 
blades of the middle and upper ones 7.3 to 11 cm. long (including the margined portion 
of the petiole), 1.5 to 2.3 cm. wide, lanceolate, acuminate, usually oblique or falcate, 
tapering or somewhat abruptly contracted into a cuneately margined petiole, crenate- 
serrulate (teeth 5 to 13 pairs, very depressed), above dark green, rather dense’ / 
hispidulous with tuberculate-based, more or less persistent hairs and gland-dot’ .d, 
beneath paler or in youth griseous, rather densely incurved-pilose with short .airs 
scarcely enlarged at base, or hispidulous-pilosulous, gland-dotted, triplinerv d and 
somewhat veiny; naked portion of petiole hispid-pilose and gland-dotted, 2 to 4mm. 
long; peduncles fistulose, striate, 2.5 to 11 cm. long, pubescent like the stem; heads 
3.5 to 5.5 cm. wide; disk 8 to 15 mm. high, 1.1 to 2 cm. thick; involucre 4-seriate, 
strongly graduated, 7 to 14 mm. high,the outermost phyllaries oblong or obovate-oval, 
3 to 5 mm. long, obtuse or abruptly subacute, indurate and ribbed below with shorter 
or longer, subherbaceous, appressed or loose tip, rather densely appressed-hispid- 
pilose or hispidulous and ciliate or ciliolate; the next series indurate and ribbed to 
middle or above and sparsely tuberculate-hispidulous, with subherbaceous, densely 
tuberculate-hispidulous and gland-dotted, obtuse or rounded, more or less spreading 
tip; the inner obovate, 3 to 7 mm. wide, indurate and vittate to above the middle 
and there subglabrous, with submembranaceous, densely tuberculate, minutely 
ciliolate and somewhat gland-dotted, broadly rounded or obtuse tip; rays 12, yellow, 
narrowly oblong, emarginate or bidenticulate, 2.3 cm. long, 4 to 5 mm. wide; disk 
corollas yellow, in youth cylindraceous, with very obscure proper tube, hispidulous 
below and on teeth, 5 mm. long, in age developing a short glabrous tube 0.5 to 0.8 mm. 
long; receptacle convex, strongly tuberculate; pales firm, abruptly acute, usually 
with a lateral tooth on each side, ribbed, sparsely tuberculate above, in maturity 
