174 PROCEEDINGS OF THE AMERICAN ACADEMY 
rate, acute at the apex, obtusish at the base, more or less distinctly _ 
3-nerved, pubescent above, canescent-tomentose over the whole sur — 
face beneath, 14-2 inches long, 7-9 lines broad: petioles short, 
pubescent; bracts of the loose corymbose inflorescence small, lance 
linear, 3-4 lines long: heads about a dozen, including rays 68 
inches in diameter: scales of the involucre ovate, acute, the outer — 
somewhat shorter, the inner longer, narrower, more oblong and ’ 
more acute, but scarcely acuminate: rays about 10, white, tube — 
hirsute-pubescent, ligula broadly elliptic, 3-toothed, 3 lines long: — 
disk flowers yellowish white (?), tube hirsute-pubescent, limb > — 
toothed: anthers entire at the base: style tips with short blunt : 
appendages: achenes small, black, oblanceolate in outline, hispid- 
ulous: pappus none. — Mountains near Patzcuaro, Michoacal, — 
November, 1891 -(n. 4099). Distinguished from S. Liebmannt, — 
Schultz Bip. ex char.,* by having heads loosely corymbose, not ; 
solitary, leaves ovate-lanceolate not elliptic, tomentose over whole : 
surface beneath instead of along the nerves. a 
GYMNOLOMIA CANESCENS. Stem striate-furrowed, branched, — 
leafy below, nearly leafless above, clothed with a close gry | 
more or less deciduous pubescence, and sparingly villous: leaves — 
opposite, ovate, subcordate, entire, acute or obtuse, triply nerves — 
2-34 inches long, roughish-pubescent above, canescent beneath i 
with silky appressed hairs; petioles 6-8 lines long: inflorescence? — 
of several slender naked branches, each bearing 1-8 rather closely 
aggregated heads (4-5 lines in diameter): pedicels and bracts 
the involucre canescent, the latter lanceolate, acuminate, rather 
loosely imbricated in 2-3 series, the outer somewhat sbortet: — 
rays 5-7, yellow, not exceeding the disk: chaff ovate-lanceolate, — 
carinate, terminating in acute pubescent points, with or without 
lateral teeth: style branches of the disk flowers with rather at 4 
tenuated tips: achenes dark, mottled with light color: pappys 4 
none. — Brackish marsh, Las Tablas, San Luis Potosi, June, 1 te 
(n. 3611), and alkaline plains, Hacienda de Angostura, San 4° — 
Potosi, June, 1891 (n. 3763). This species differs from the othe 7 
Gymnolomias which I have examined, in having more atten a 
ated style tips, but it appears better placed in this genus thet 
elsewhere. oe 
TITHONIA BRACHYPAPPA. Stem terete, striate, smooth or neatly 
go, branched above: branches terminating in peduncles thicke 
ey et) 
ait 
* Klatt in Leopoldina, XXIITL. 2. 
