402 OXALIDACEAE 



Club 34:264 (1907), typo loc. Onofre Mts., Abrams 3274. 0. pilosa Nutt.; T. & G. Fl. 1:212 

 (1838), t}T)e loc. Santa Barbara, Nuttall. Xanthoxalis pilosa Small, N. Am. Fl. 25:54 (1907). 

 Var. ATROPURPUREA Planch. Fl. Scrres 12 :t. 1205 (1857) ; Jepson, Man. 588 (1925), 



2. 0. suksdorfii Trel. Stems trailing or decumbent, these and the stolons aris- 

 ing from the crown of a taproot, i/o to 1 foot long; herbage thinly pilose, or the 

 leaflets subglabrous except for the ciliate margins; leaflets I/2 to 1 inch wide; 

 peduncles 2 (or 3) -flowered ; pedicels 8 to 11 lines long ; sepals obtuse ; petals bright 

 yellow, 7 to 8 lines long; flowers of 3 kinds as to styles and stamens: (a) short 

 stamens about half the length of the long stamens, the styles intermediate; (b) 

 short and long stamens nearly equal, half as long as the styles; (c) styles shorter 

 than the short stamens ; capsule oblong, 5 lines long. 



Shady woods, 1000 to 2000 feet : northern Humboldt Co. North to Washing- 

 ton. July-Aug. 



Locg, — Berrys Mtn., Redwood Creek, Tracy 8796. Oregon: Tamba Ranch, Chetco River, 

 Curry Co., Jepson 9366a, Tracy 5897. 



Kefs. — OxALis SUKSDORFH Trel. Mem. Bost. Soc. Nat. Hist. 4:89 (1888). 0. pumila Nutt.; 

 T. & G. Fl. 1 :212 (1838), type loc. "forests of the Rocky Mts. and Oregon", Nuttall; not O. pumila 

 Urv. (1826). Xanthoxalis suksdorfii Small, N. Am. Fl. 25:53 (1907). 



OxALis CERNUA Thunb. Diss. Oxalis 14 (1781), type from South Africa, Root-stocks bearing 

 bulblets at the nodes; petals bright yellow, % to 1^4 inches long. — Occasionally escaped from 

 gardens to cultivated fields. 



3. 0. oregana Nutt. Redwood Sorrel. Scapes and leaves from a creeping 

 rootstock ; leaflets pubescent or subglabrous, the scapes and petioles more or less 

 rusty-villous ; scapes 2 to 7 inches high, 2-bracted near the top, commonly 1- 

 flowered ; leaflets broadly obcordate, broader than long, 1 to 1% inches long ; petals 

 oblong-obovate, slightly retuse or obtuse, pink, white, lavender or rose-color, often 

 vemed with purple, 9 to 12 lines long ; styles exceeding the long stamens ; capsules 

 obovoid to round-ovoid, 8 to 6 lines long. 



Shady woods, 50 to 2000 feet : Redwood belt from the Santa Lucia Mts, to Del 

 Norte Co. North to Washington. Mar.-May. 



Biol. note. — Oxalis oregana is one of the most characteristic plants of the forest floor under 

 Redwood. There is a mean of shade which is most agreeable to it and where, often, it forms pure 

 carpets of great extent. In such situations the leaflets stand horizontally at mid-day, but where 

 a break in the canopy permits sunlight the leaflets fold down on their midribs parasol-like. In 

 extremely dense Redwood stands 250 to 300 feet high the species is sometimes absent. The anthers 

 of the five short stamens are borne opposite the yellow dots on the lower part of the petals and 

 thus stand over the entrance way to the honey-gland which lies in the creased or channeled claw. 

 The margins of the claws are connivent. 



Locs. — Lucia, Monterey Co., Jepson; Little Sur River, Monterey Co., Davy 7315; Greninger 

 Creek, w. of Gilroy, Jepson 9686;- Big Basin, Santa Cruz Mts., Jepson; Kings Mt., San Mateo 

 Co., C. F. Baker 325 ; Mill Valley, Mt. Tamalpais, Jepson 13,547 ; Papermill Creek, Marin Co., 

 Jepson 10,310a; Pt. Reyes, Greene; Comptche, B. A. Walker 269; Willits, Docia Patchett; Hub- 

 bards sta., Humboldt Co., Jepson; Wilder Ridge, Humboldt Co., Jepson; Bull Creek, Humboldt 

 Co., Jepson 16,432 ; High Prairie Creek near Bald Mt., Humboldt Co., Tracy 4940; Nobles Ranch, 

 New River, Jepson; Mud Spr. near Hupa, Jepson. 



Var. tracyi Jepson. Petals white, often veined with pink, relatively narrow, obtuse, 4 to 7 

 lines long. — Humboldt Co. and north to Curry Co., Oregon. 



Refs.— Oxalis oregana Nutt. ; T. & G. Fl. 1 :211 (1838), type loc. shady woods of the Colum- 

 bia River, Nuttall; Jepson, Fl. W. Mid. Cal. 246 (1901), ed. 2, 241 (1911), Man. 588, fig. 582 

 (1925). 0. macra Small, N. Am. Fl. 25:26 (1907), type loc. Santa Lucia Mts., B. A. Plaskett. 

 Var. tracyi Jepson, Man. 588 (1925), type loc. Tamba Ranch, Chetco River, sw. Ore., Jepson 9366. 



4. 0. trilliifolia Hook. Columbia Oxalis. Scapes and leaves all basal from 

 a fleshy-scaly rootstock ; scapes as long as the leaves, 5 to 10 inches high, umbellately 

 3 to 6-flowered; leaflets thin, 1 to II/2 inches long; petals nearly white, deeply 

 notched, 3 to 6 lines long; styles longer than the long stamens; capsules linear, 

 10 to 15 lines long. 



Montane meadows, or along streamlets, 500 to 6000 feet : northern Humboldt 

 Co. North to Washington. May-June. 



