Donnelismithia serrata

Donnelismithia serrata (Coult. & Rose) Math. & Const
Bull. Torrey Club 68: 123. 1941.
Museniopsis serrata Coult. & Rose, Contr. U. S. Nat. Herb. 3: 304. 1895. Velaea serrata Drude in E. & P. Nat. Pfl. 3»: 170. 1898.
Perennial from a taproot, 4—10 dm. high, the foliage scaberulous; leaves ovate-deltoid in general outline, excluding the petioles 5-15 cm. long, 2-3-ternate, the leaflets ovate-lanceolate to ovate, 1-4 cm. long, 1-3 cm. broad, distinct or the terminal confluent, petiolulate to sessile, acute at the apex, cuneate at the base, coarsely serrate and pinnately incised or lobed, the lobes acute and callous-tipped, scaberulous on both surfaces, the veins, the margins, and the rachis; petioles 5-15 cm. long; uppermost cauline leaves with linear to filiform, often elongate divisions; peduncles alternate or verticillate, 2.5-8 (or 12) cm. long; involucre wanting; involucel wanting; rays 4 or 5, 25-45 (or 60) mm. long; fertile pedicels 2-8, 3-6 mm. long, longer than the sterile pedicels, slightly webbed at the base; flowers yellow; stylopodium depressed, not evident; fruit nearly orbicular, 2-3 mm. long, cordate at the base, truncate at the apex, glabrous, the ribs low, filiform, evident; oil-tubes 3 or 4 in the intervals, 6-8 on the commissure; seed-face deeply sulcate.
Type locality: "From the Cuesta de San Juan del Estado and from the continental divide near Las Sedas," Oaxaca, Pringle 5542.
Distribution: Puebla to Oaxaca; Guerrero (Purpus 6514).