140 PROCEEDINGS OF THE AMERICAN ACADEMY 



achenes triangular-obovate, over a line long, transversely rugose. — 

 Valley near Irapuata, Guanajuato ; Sept., 1889 (u. 2821). Near 

 M. montanum. 



Melampodium (Unxia) bibracteatuji. Annual, glabrous, a foot 

 high; leaves oblong to oblauceolate, acute, sparingly toothed, |- to H 

 inches long: heads sessile; outer involucre of two foliaceous broadly 

 ovate opposite bracts, 3 lines long, the inner saccate, closely enclosing 

 and conformable to the achenes, thin and somewhat reticulated, un- 

 a^jpendaged : disk-flowers 5, sterile; ray-flowers 5, the yellowish ligule 

 very short (^ line long or less) : achenes obliquely obovate and com- 

 pressed, smooth and coriaceous, a line long; pappus none. — In fields 

 at Del Rio, State of Mexico; August, 1890 (n. 3230). 



TiTHONiA MACROPiiYLLA. Leaves thin, scabrous above and on the 

 veins beneath, the cauline large (about a foot long) with a broadly 

 ovate blade cuneate from a shallow sinus and decurrent into the winged 

 petiole, deeply 3-lobed, the lobes narrowly acuminate and serrate ; 

 uppermost leaves much smaller, ovate, not lobed : peduncles and heads 

 sparingly pubescent; outer involucral scales foliaceous, narrowly lan- 

 ceolate, acuminate, an inch long or more, the inner somewhat shorter 

 and broader: rays orange, l^- inches long: achenes appressed-silky, 

 4 lines long ; pappus of two awns and a crown of six broad and very 

 obtuse denticulate scales half as long. — Barranca, near Guadalajara ; 

 Sept., 1889 (n. 2798). 



ViGUiERA LEPTOCAULis. Annual; stem erect, slender, 3 or 4 

 feet high, sparingly branched and somewhat strigose above, glabrous 

 below : leaves opposite, narrowly lanceolate, abruptly cuneate to a 

 short petiole, attenuate upward from near the base, sparsely serru- 

 late, very scabrous above, 4 inches long : heads solitary on the few 

 branches; involucral scales linear-lanceolate, long-acuminate: ray- 

 flowers sterile ; ligules orange, an inch long : achenes glabrous, com- 

 pressed, bearing a single caducous attenuate chaffy palea dilated and 

 lacerate at base. — In the Sierra Madre near Monterey: July, 1888 

 (n. 2247). 



OroPAPPUS ACUMiNATDS. Tall, scabrous: leaves opposite on slen- 

 der petioles (3 to 6 lines long), ovate- to oblongdanceolate, narrowly 

 long-acuminate, rounded or subcordate at base, distantly glandular- 

 serrulate, very scabrous above and scabrous-hirsute on the veins be- 

 neath, 3 to G inches long by | to H broad: heads in terminal and 

 axillary pedunculate corymbs, broad and many-flowered, radiate, 3 

 lines high ; involucral scales in several series, short, narrow, somewhat 

 squarrosely tipped: ligules small (1^ lines long) : achenes of the ray 



