WOOTON AND STANDLEY—NEW PLANTS FROM NEW MEXICO. 149 
Type in the U. S. National Herbarium, no, 498146, collected on Trujillo 
Creek, Sierra County, at an altitude of 2400 meters, September 14, 1904, by 
O. B. Metcalfe (no. 1864). 
ADDITIONAL SPECIMENS EXAMINED: New Mexico—Organ Mountains, Septem- 
ber 10, 1899, Wooton. Arizona—Sonoita Valley, 1874, Rothrock 642; near Fort 
Huachuca, 1894, Wileor 481; Bowie, 1884, Jones 4308; pass of the Chiricahua 
Mountains, 1851, Wright 1981. Trexas—Limpio Canyon, 1889, Nealley 659. 
Mexico—Near Durango, 1896, Palmer 484. 
The material from southern New Mexico and Arizona has mostly been re- 
ferred to Mentzelia aspera, a West Indian species with larger flowers, the 
outer row of filaments petaloid, the leaves acuminate and with more finely 
toothed margins and longer petioles. The Mexican representatives have been 
referred to Mentzelia hispida Willd., which has much larger flowers and leaves. 
Some of the Texas specimens have been called Mentzelia oligosperma, but that 
is a tuberous-rooted perennial with different leaves and habit. 
Mentzelia monosperma Wooton & Standley, sp. nov. 
Tuberous-rooted perennial with divaricately branched stems 30 to 40 em. 
high, forming a plant of as great or greater diameter; cortex on young stems 
yellowish green, hispid, becoming smooth, white, and papery; leaves broadly 
ovate in outline, obscurely 8-lobed, with a few coarse, sinuate teeth, broadly 
cuneate at the base, on petioles 2 or 8 mm. long, almost sessile above, acute 
or obtuse, bright green; flowers solitary, resembling those of M. oligosperma 
but smaller and with broader, shorter petals and calyx lobes; outer row of 
filaments about twice as wide as the inner ones; fruit clavate, woody when 
mature, about 1 cm. long, with a single large seed 38 mm. long, this elliptic- 
oblong more or less triangular in cross section, dull brownish, finely striate with 
undulating lines. 
Type in the U. S. National Herbarium, no. 690230, collected in the Organ 
Mountains, August 29, 1894, by E. O. Wooton. 
ADDITIONAL SPECIMENS EXAMINED: Thirty-five miles west of Roswell, 1900, 
Earle 521. 
In root and seed characters this plant is very similar to Mentzelia oligo- 
sperma, to which it has been referred. The flowers and habit of the plant are 
different from those of that species. It has been collected only once in the 
type locality, therefore is probably very rare. 
Nuttallia gypsea Wooton & Standley, sp. nov. 
Tufted, herbaceous perennial, 20 to 40 em. high, branching freely above, 
leafy to the top; cortex white and smooth below, scabrous above; leaves green, 
oblong in outline, 2 to 4 em. long, about 1 cm. wide or less, pinnately divided 
into linear, mostly obtuse segments barely 1 mm. wide, short-petiolate, never 
elasping or auriculate at the base, rough with scattered, recurved, stout, white, 
barbed hairs swollen at the bases; flowers small, on short, terminal pedicels, 
subtended by 1 or 2 small, linear bracts; hypanthium campanulate, 3 to 4 
- mm. long; sepals ovate-lanceolate, acuminate in bud, about 5 mm. long, becoming 
triangular-subulate; petals lanceolate, broader than the 5 inner staminodia, 
pale yellow, tapering to the base, acute, 12 to 15 mm. long, 2 to 38 mm. wide; 
stamens numerous, the outer filaments somewhat dilated, about as long as the 
petals, the inner ones shorter; capsules almost hemispheric, about 7 mm. long; 
seeds numerous, flat, winged, minutely tuberculate. 
Type in the U. S. National Herbarium, no. 564614, collected on pure gypsum 
near Lakewood, August 6, 1909, by E. O. Wooton. 
