Lomatium hallii (S. Wats.) Coult. & Rose

Lomatium nelsonianum F. Macbr. Contr. Gray Herb. 53: 15. 1918.
Plants short-caulescent, 2.5-4 dm. high; leaves ovate in general outline, excluding the petioles up to 2.5 (?) dm. long, ternately to ternate-pinnately decompound, the ultimate divisions linear or filiform (?), about 3 mm. long, less than 0.5 mm. broad, glabrous or sparingly hispid (?); petioles 2.5-5 cm. long, sheathing at the base; peduncles exceeding the leaves; involucel of filiform, sparingly hispid bractlets, up to one-half the length of the pedicels; rays 8-15, ascending, 2.5-7 cm. long, unequal; pedicels 8-16 mm. long, minutely pubescent to glabrate, spreading, the umbellets 15-20-flowered; flowers yellow (?); fruit oblong-oval, 7-9 mm. long, 4-6.5 mm. broad, glabrous, the wings slightly narrower than the body; oil-tubes 3 in the intervals, 6 on the commissure.
Type locality: "Dry rocky hillside near Mule Creek, Curry County, Oregon," J. C. Nelson 1419 (in part).
Distribution: Known only from the region of the type collection (which is apparently a mixture of this and of L. dissectum) {Leach 3419).

Lomatium hallii (S. Wats.) Coult. & Rose, Contr. U. S. Nat Herb. 7: 224. 1900.
Peucedanum nudicaule A. Gray, Proc. Am. Acad. 8: 385. 1872. Not Smyrnium nudicaule Pursh,
1814. Peucedanum Hallii S. Wats. Proc. Am. Acad. 11: 141. 1876.
Peucedanum microcarpum Howell; Coult. & Rose, Rev. N. Am. Umbell. 65. 1888. Lomatium Leibergi Coult. & Rose, Contr. U. S. Nat. Herb. 7: 224. 1900. Lomatium microcarpum Coult. & Rose. Contr. U. S. Nat. Herb. 7: 230. 1900. Cogswellia Hallii M. E. Jones, Contr. W. Bot. 12: 35. 1908. Cogswellia microcarpa M. E. Jones. Contr. W. Bot. 12: 35. 1908. Cogswellia Leibergii M. E. Jones, Contr. W. Bot. 12: 35. 1908.
Plants short-caulescent, 2-3.5 dm. high, glabrous except for an occasional slight scaberulence in the inflorescence; leaves oblong in general outline, excluding the petioles 4.5-10 cm. long, tripinuate, the ultimate divisions (except the uppermost) distinct, linear or oblong, 2-4 mm. long, less than 1 mm. broad, entire, apiculate; petioles 3-6 cm. long, sheathing to about the middle, purplish, scarious-margined ; peduncles exceeding the leaves; involucel of linearlanceolate, acuminate bractlets, equaling the flowers; rays 9-17, spreading, 1.3-5 cm. long, unequal, glabrous or scaberulous below; pedicels 4—7 mm. long, glabrous or scaberulous, the umbellets about 30-flowered; flowers yellow; fruit oblong, 5-7 mm. long, about 3 mm. broad, the wings about one-half the width of the body; oiltubes 2 or 3 in the intervals, 5 on the commissure.
Type locality: Oregon, probably Silver Creek, Marion County, Hall 211. Distribution: Western slope of the Cascade Mountains, Oregon (Thompson 10,174, Constance, Henderson & Rollins 1471).

Lomatium hallii là một loài thực vật có hoa trong họ Hoa tán. Loài này được (S. Watson) J.M. Coult. & Rose mô tả khoa học đầu tiên năm 1900.