Gardner's Yampah

Perideridia gairdneri (H. & A.) Mathias, Brittonia 2 : 244. 1936
? Osmorhiza ! edulis Raf. Med. Fl. 2: 249. 1830.
A tenia Gairdneri H. & A. Bot. Beech. Voy. 349. 1838.
Edosmia Gairdneri T. & G. Fl. N. Am. 1: 612. 1840.
Edosmia montana Nutt.; T. & G. Fl. N. Am. 1: 612, as syn. 1840.
Edosmia praealta Nutt.; T. & G. Fl. N. Am. 1: 612, as syn. 1840.
Carum Gairdneri A. Gray, Proc. Am. Acad. 7: 344. 1868.
Caruw montanum Blankinship, Mont. Agr. Coll. Sci. Stud. 1: 91. 1905.
Carum Garreltii A. Nelson; Coult. & Rose, Contr. U. S. Nat. Herb. 12: 443. 1909.
Atenia montana Rydb. Bull. Torrey Club 40: 67. 1913.
Atenia Garrettii Rydb. Bull. Torrey Club 40: 68. 1913.
Carum erythrorhizum Piper, Proc. Biol. Soc. Wash. 29: 100. 1916.
Ataenia erythrorrhiza H. Wolff in Engler, Pflanzenreich 90 (4 22 ») : 172. 1927.
Slender, from a solitary fusiform tuber or a small fascicle of tubers, 3-12 dm. high; leaves oblong to ovate in general outline, excluding the petioles 1-2 dm. long, pinnate or occasionally bipinnate, the ultimate divisions linear or rarely lanceolate, 2-15 cm. long, entire or rarely lobed or toothed; petioles 4-8 cm. long; peduncles slender, 2-12 cm. long; involucre wanting or of 1-several setaceous bracts; involucel of several linear, scarious or green bractlets, 1-4 mm. long, mostly shorter than the flowers and fruit; rays usually 8-20, 1.5-6 cm. long; pedicels 3-7 mm. long; styles slender, recurved, about 1 mm. long; stylopodium low; fruit orbicular to suborbicular, 2-3 mm. long, 1.5-2.5 mm. broad; oil-tubes solitary in the intervals, 2 on the commissure; seed terete in cross section.
Type locality: California. Lay b° Collie.
Distribution: Alberta, South Dakota, and Montana to British Columbia and Washington, south to Arizona and New Mexico and through the Coast Ranges to Southern California (Heller &* Heller 3412, Sandberg &• Leiberg 414).