128 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
sepals purplish, stellate-pubescent ; petals yellow, as long as the sepals, narrowly 
oblanceolate or spatulate; fruiting racemes, rachis, pedicels, and siliques perfectly 
glabrous; pedicels about 10 mm, long, divergent or slightly ascending; siliques 
5 or 6 mm. long, oblong, acute at both ends; seeds in two rows. 
Type in the U. 8. National Herbarium, no. 564228, collected in the Organ 
Mountains, March 21, 1907, by E. O. Wooton and Paul C. Standley. The speci- 
mens were collected in an arroyo at the foot of the mountains not far from 
Van Pattens Camp. They grew among the rocks and about the edges of cliffs. 
ADDITIONAL SPECIMENS EXAMINED: Van Pattens, April 25, 1895, Wooton; Fil- 
more Canyon, April 18, 1903, Wooton; Bishops Cap, March 30, 1895, Wooton; 
Bishops Cap, 1908, Wooton 3815. 
The species is most closely related to 8. halictorum, but is distinguished by 
its habit, its strictly glabrous racemes, and the slightly smaller fruit. So far 
as our material shows, it is restricted to the Organ Mountains, where it is the 
common and almost the only Sophia, though it is not nearly as abundant as the 
nearly related species of the adjacent Mesilla Valley. It occurs in the Upper 
Sonoran Zone. 
Thelypodium vernale Wooton & Standley, sp. nov. 
Probably biennial, glabrous, about 40 em. high; stems slender, branched 
throughout, glaucous, purplish near the base, the branches strongly ascending; 
cauline leaves triangular-lanceolate, attenuate, 385 to 50 mm. long, slightly 
glaucous, entire, somewhat undulate, auriculate-clasping at the base, the lobes 
obtuse, 5 to 7 mm. long; pedicels ascending, slender, about 5 mm. long; sepals 
narrowly oblong, obtuse, 2.5 mm. long, green or tinged with purple; petals 
white, slightly tinged with purple, narrowly oblong, tapering gradually toward 
the base, the whole 5 mm. long or less; pods slender, 40 to 60 mm. long, some- 
what divergent, arcuate; septum without a midrib; style truncate, not bilobate. 
Type in the U. S. National Herbarium, no. 690257, collected in the low moun- 
tains west of San Antonio, Socorro County, April 14, 1908, by E. O, Wooton 
(no. 3847). . 
This slightly resembles 7, sagittatum, but the flowers are much smaller, the 
leaves more acute, and the whole plant much smaller and more slender. 
CAPPARIDACEAE. 
Peritoma breviflorum Wooton & Standley, sp. nov. 
Slender annual, 40 to 50 cm. high, simple at the base, above with numerous 
ascending or spreading branches; stems green, glabrous; leaflets 3, elliptic or 
narrowly elliptic-oblanceolate, green, glabrous, abruptly acute; terminal racemes 
very short, 4 to 6 cm. long, slender, villous: bracts small, 3 mm. long or less, 
nearly linear, attenuate; pedicels slender, 4 to 7 mm. long; calyx united at the 
base, persistent, the lobes narrowly triangular, acute, yellowish green: petals 
deep yellow, small, 2.5 to 4 mm. long, oblong-obovate, obtuse, entire, abruptly 
contracted at the base into a very short claw; stamens 6, only slightly exceeding 
the petals; capsules oblong, 15 to 20 mm. long, acutish, glabrous, torulose, on a 
slender stipe 4 mm. long; seeds 6 or fewer, ovoid, 3.5 mm. long, brownish, irreg- 
ularly tuberculate; style very short, about 0.5 mm. long. 
Type in the U. S. National Herbarium, no, 686249, collected on the dry, stony 
hills about Shiprock, July 25, 1911, by Paul C. Standley (no. 7282). Upper 
Sonoran Zone; altitude about 1425 meters. 
The plant is fairly abundant in the region along the low mesas bordering the 
valley of the San Juan River. It is associated with various species of Atriplex 
and other plants characteristic of alkaline situations. It is similar to P. luteum, 
but the flowers are only half as large, the petals relatively broader and with 
