PURSLANE FAMILY 133 



2. Lewisia Tweedyi (A. Gray) Robinson. Tweedy's Lewisia. Fig. 1645. 



Calandrinia Tweedyi A. Gray, Proc. Amer. Acad. 22: 277. 1887. 

 Oreobroma Tweedyi Howell, Erythea 1 : 33. 1893. 



Lewisia Tweedyi Robinson in A. Gray. Syn. Fl. N. Amer. I 1 : 268. 1897. 

 Lewisia aurantiaca A. Nels. Univ. Wyo. Pub. Bot. 1: 63. 1924. 



Glabrous perennial with fleshy, usually branching root and short, thick caudex. Leaves basal, 

 obovate, entire, sometimes emarginate at apex, 7-15 cm. long, 2.5-3.5 cm. broad, the petiole about 

 equaling the blade; flowering scapes several, equaling or surpassing the leaves, with broadly 

 lanceolate scarious bracts below the inflorescence and subtending the branches ; inflorescence 

 racemose 1-3-flowered; sepals 9-10 mm. long, rounded oval, scarious; petals 10-12, ovate, acute 

 at base, white or yellow, 2.5-3 cm. long, stamens about 15, half the length of the petals, ovules 

 25-30 ; 'capsule ovate, 9 mm. long, firm-walled ; seeds 12-20, granulate, dark, scarcely shining, 

 with conspicuous scale-like aril. 



Rocky slopes, Arid Transition Zone; Chelan County, Washington. Type locality: Wenatchee Mountains, 

 Washington. May-July. 



3. Lewisia oppositifolia (S. Wats.) Robinson. Opposite-leaved Lewisia. 



Fig. 1646. 



Calandrinia oppositifolia S. Wats. Proc. Amer. Acad. 20: 355. 1885. 



Oreobroma oppositifolium Howell, Erythea 1 : 32. 1893. 



Lewisia oppositifolia Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 268. 1897. 



Caulescent perennial 10-17 cm. high with a thickened, often branching root and short caudex. 

 Basal leaves few, linear-spatulate, 5-10 cm. long; stem leaves similar, 1-2 pairs near the base of 

 the stem ; stems 1-4 from each root ; inflorescence subumbellate, 2-6-flowered, the subtending 

 bracts entire or sometimes erose at the apex; pedicels 2.5-5 cm. long; sepals orbicular, 5-8 mm. 

 long irregularly fimbriate-dentate, glandless, not conspicuously veiny in age ; petals white or 

 pinkish, 9-12 mm. long; stamens many; stigmas deeply cleft; ovules 18-25; capsule ovoid, 5 mm. 

 high; seeds 6-15, dark, shining. 



Rocky ground, Transition Zone; Josephine County, Oregon, to Del Norte County, California. Type locality: 

 Waldo, Oregon. March-May. 



4. Lewisia Cotyledon (S. Wats.) Robinson. Siskiyou Lewisia. Fig. 1647. 



Calandrinia Cotyledon S. Wats. Proc. Amer. Acad. 20: 255. 1885. 

 Oreobroma Cotyledon Howell, Erythea 1 : 32. 1893. 



Lewisia Cotyledon Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 268. 1897. 

 Lewisia Finchae Purdy, Leaflets West. Bot. 1 : 20. 1932. 



Perennial with thickened roots and heavy caudex 1-2 cm. thick. Leaves basal, many, 3.5-11 

 cm. long, spatulate, margins entire to undulate, sometimes apiculate at the apex, but little crisped, 

 petiole broadened at the base ; stems several, 6-30 cm. high with 2-4 alternate or opposite toothed 

 bracts below the inflorescence; inflorescence short-paniculate, branches subtended by toothed 

 glandular bracts; flowers many, short-petioled ; sepals 5-6 mm. long, 3.5-6 mm. broad, many- 

 nerved, obtuse to truncate, each nerve ending with a dark gland-tipped tooth; petals 8-10, white 

 tinged with rose or salmon turning rose with age, obovate to spatulate, 12-15 mm. long; stamens 

 5-8, shorter than the petals, slightly united at the base ; ovules 13-20 ; capsule ovoid, 5-6 mm. high ; 

 seeds 8-15, dark, shining. 



Rocky soil or in rock crevices, Transition and Canadian Zones; mountains of southwestern Oregon and north- 

 western California. Type locality: headwaters of the Illinois River, California. April-May. 



Lewisia Cotyledon var. Howellii (S. Wats.) Jepson, Fl. Calif. 479. 1914. (Oreobroma Heckneri Mor- 

 ton.) Leaf margins conspicuously crisped or fimbriate-toothed and panicles 6-12-flowered. Josephine County, 

 Oregon, south to Trinity County, California. 



5. Lewisia Leana (Porter) Robinson. Lee's Lewisia. Fig. 1648. 



Calandrinia Leana Porter, Bot. Gaz. 1 : 49. 1876. 



Oreobroma Leanum Howell, Erythea 1: 31. 1893. 



Lewisia Leana Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 267. 1897. 



Perennial with branching roots and thick, fleshy caudex. Leaves many, fleshy, terete or nearly 

 so, acute, 1.5-3 cm. long; stems 1-4, 11-18 cm. long, jointed at the base, occasionally with lacimate 

 glandular-toothed bracts below the panicle ; divaricate branches of the inflorescence bracteate ; 

 flowers many ; petals 5-6 . 5 mm. long, obovate, magenta or white streaked with red ; sepals 1 . 5-2 

 mm. long, truncate, lacerose-dentate, the teeth with dark glands; stamens 4-8, about the length 

 of the petals ; ovules 5-6, sometimes 3 ; capsule thin, ovate, 4-5 mm. long ; seeds 3, rarely more, 

 2-2.5 mm. long, dark brown, shining. 



On rocks, Boreal Zone; mountains of southwestern Oregon and northwestern California. Type locality: 

 Siskiyou Mountains. June-Aug. 



6. Lewisia columbiana (Howell) Robinson. Columbia Lewisia. Fig. 1649. 



Calandrinia columbiana Howell in A. Gray, Proc. Amer. Acad. 22: 277. 1887. 

 Oreobroma columbianum Howell, Erythea 1: 32. 1893. 

 Lewisia columbiana Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 269. 1897. 

 Lewisia Eastwoodiana Purdy, Leaflets West. Bot. 1: 20. 1932. 



Perennial with thick root and short caudex. Basal leaves fleshy, 3-8 cm. long, flat, narrowly 

 oblanceolate ; stem leaves few, bracteate; stems several, 12-30 cm. high; inflorescence looselv 



