Rhysopterus plurijugus Coult. & Rose

Rhysopterus plurijugus Coult. & Rose, Contr. U. S. Nat Herb. 7: 186. 1900.
Cymopterus plurijugus M. E. Jones, Contr. W. Bot. 12: 25. 1908.
Plants, including the pseudoscape, 10-15 cm. high, the pseudoscape 4-13 cm. long; leaves ovate-oblong in general outline, excluding the petioles 1-4 cm. long, 1.5-5 cm. broad, the ultimate lobes 1-4 mm. long and about as broad, mueronulate; petioles 5-30 mm. long; rays several, stout, 5-14 mm. long; bractlets of the involucel ovate-oblong, acute, mueronulate, frequently searious-margined; fruit ovoid to orbicular, 3 L 4 mm. long, 2-3 mm. broad, sometimes purplishtinged, the ribs equal.
Type locality : ' ' Black serpentine dykes around a peak rising from Malheur Valley about 1 2 km. west of confluence of Cottonwood Creek and Malheur, near Harper Ranch, Oregon," Leiberg 2240.
Distribution: Southeastern Oregon (Peck 6448).

Cymopterus corrugatus M. EJones, Am. Nat. 17: 973. 1883
Rhysopterus corrugatus Coult. & Rose, Contr. U. S. Nat. Herb. 7: 187. 1900.
Plants acaulescent or subcaulescent with the development of a pseudoscape, glabrous, 3-10.5 cm. high; leaves oblong-ovate in general outline, excluding the petioles 0.5-4 cm. long, about as broad, pinnate, pallid, coriaceous or somewhat fleshy, the leaflets pinnately lobed, the lobes 2-3-lbbulate, obtuse, apiculate; petioles 1-4 cm. long; peduncles shorter than or equaling the leaves; involucre wanting; involucel of scarious to submembranaceous, entire bractlets, acute at the apex, shorter than the flowers; fertile rays 4-10, somewhat spreading, 2-10 mm. long; pedicels 2-3 mm. long; flowers white; fruit ovoid-oblong, 3-5 mm. long, about 2 mm. broad, the wings constricted at the base, thin and corrugated, narrower than the body ; dorsal wings 3, similar to the lateral; oil-tubes solitary in the intervals, 2-4 on the commissure; seedface concave.
Type locality: Humboldt Lake (near Rose Creek), Nevada. M. E. Jones 3886. Distribution: Western Nevada and adjacent Oregon (Kennedy 872, Mason 4604, Mathias 1244).