116 PROCEEDINGS OF THE AMERICAN ACADEMY. 
1} lines long: calyx striate, sparingly silky, entirely obscured by the 
bracts: petals white or nearly so, oblong, obtuse, attenuate below to 
slender claws: stamens 10.— Collected at Las Pinitos, Sonora, at 
6,100 feet, by Mr. Hartman, 14 October, 1890 (no. 133). A species 
with the habit of a Petalostemon rather than a Dalea ; the fresh leaves 
very aromatic when crushed. 
Sepum Lumnoxtrzu. Hoary puberulent: roots fibrous: stems 
herbaceous, decumbent, 5-10 inches high, ancipital, simple below the 
spreading cymose inflorescences : leaves soft pubescent and ciliated ; 
the basal ones crowded, spatulate, 4-6 lines long; the cauline spatu- 
late-oblong, obtuse, somewhat narrowed to a slightly extended base, 
about an inch in length, 2-3 lines broad: flowers numerous, pedicel- 
late, white: sepals lance-oblong, obtusish, 1} lines long, not at all 
extended at the base: petals lanceolate, acute, 2} lines long: carpels 
5, pruinose, erect, attenuate; styles persistent; scales small, truncate, 
bright red; seeds oblong, } line in length. — Collected at Nacory, 
Sonora, at 3,700 feet, by Mr. Hartman, 4 December; 1890 (no. 287) ; 
and at Huchuerachi, Sonora, by Mr. Lloyd, 8 December, 1890 
(no. 389). 
Stcros cortinus. Stem slender, glabrous, furrowed: tendrils 
2-3-parted: leaves thin, 5-lobed, scarcely paler beneath, 14-2} inches 
long, usually narrower, roughened upon both surfaces with minute 
whitish tubercular hairs ; lobes ovate to lanceolate, acute or acuminate, 
sharply dentate or denticulate; the terminal ones often elongated; 
petioles 4-12 lines long: g peduncles 1}-3 inches in length, smooth 
or nearly so; inflorescences slender, usually simple, slightly puberulent 
or quite smooth, 4-1} inches long, 10-35-flowered; pedicels very 
slender, spreading, smooth, equal, slightly thickened at the apex, 13-2 
lines in length : calyx teeth very minute or obsolete: corolla rotate- 
campanulate, 24-3 lines in diameter, finely granular; lobes broadly 
Ovate, obtusish: stamineal column (including the anthers) ? line long: 
? peduncles 2 lines long, smooth; fruits 2-5 in a head, ovate, acumi- 
nate, compressed, nearly 3 lines long, sparingly setose, otherwise nearly 
glabrous; sete 1} lines long.—Collected on hills near Chihuahua, 
by Mr. C. G. Pringle, 23 October, 1885 (no. 568) ; and in the Cafion 
de San Diego, Chihuahua, by Mr. Hartman, 17 September, 1891 
(no. 773), A species near S. Deppei, Don, but with leaves smaller 
and somewhat more acutely lobed; peduncles and inflorescences nearly 
°r quite glabrous; petioles and pedicels shorter; and male flowers a_ 
little small : 
Gatium Wricutu, Gray, var. LaTIFOLIUM. Pubescent below as_ ae 
