PURSLANE FAMILY' 475 



row, long-petioled; cauline leaves narrowly to oblong-lanceolate, sessile, 1 to 



2 inches long; racemes 1, or sometimes 2 or 3, sessile or short-peduncled, 5 to 

 17-flowered, the pedicels bractless except the lowest ; petals pink with darker 

 veins, or nearly white, often with a .yellow dot at base, emarginate or obtuse, 



3 to 4 lines long; pedicels recurved in fruit. 



Montane, 4500 to 7000 feet, northern Sierra Nevada north to Modoc Co., 

 thence west to Humboldt Co. North to British Columbia and east to Utah. 



Locs. Cisco, Kellogg; Mt. Lassen, Jepson 4089; Susanville, Austin fy Bruce; Forestdale, 

 Modoc Co., Baker; Shackleford Canon, w. Siskiyou Co., Chandler; Marble Mt., Jepson 2836 

 (sometimes with 6 petals and 6 stamens; one flower had 8 petals, 2 of them % united, stamens 

 <5) ; Trinity Summit, Jepson 2104. 



Refs. CLAYTONIA LANCEOLATA Pursh, Fl. 1: 175 (1814), type loc. Bitterroot Mts., Idaho, 

 Lewis; Gray, Am. Jour. Sci. ser. 2, 33: 407 (1862). Var. sessilifolia Nelson, Bull. Torr. Club, 

 27: 259 (1900). C. caroliniana var. sessilifolia Torr.; Brew. & Wats. Bot. Cal. 1: 76 (1876). 



5. LEWISIA Pursh. 



Acaulescent fleshy perennials with very thick farinaceous roots bearing 

 rosulate clusters of leaves and 1 to many-flowered scapes. Flowers often 

 large and handsome. Sepals 2 to 8, herbaceous, persistent. Petals 5 to 16, 

 varying from white to red. Stamens 5 to numerous. Style-branches 3 to 8, 

 filiform, stigmatic their whole length. Capsule circumscissile near the base, 

 the upper deciduous part more or less valvate-cleft from the base. Seeds sev- 

 eral to many. Species 11, western North America. (In honor of Capt. Lewis 

 of the Lewis & Clark expedition across the continent, who collected the type 

 species.) 



The flower-parts in the species of this genus are very variable in number 

 even on the same plant, more so than in any other genus of this family. The 

 flower diagnoses which follow are chiefly based on notes made in the field, 

 many counts having been made of flower parts on individual plants. 



Sepals 2; flowers medium; scapes commonly bearing a cyme or panicle. Subgenus OREOBROMA. 

 Stems from a small globose corm; leaves 2 or 3 below the inflorescence . . . .1. L. triphylla. 

 Stems scape-like, leafless. 



Scapes 1 to 4-flowered, with a pair of small bract-like leaves; root thick, fusiform to 



globose. 

 Leaves exceeding scapes; scapes 1 to 3-flowered. 



Bracts ovate, borne above the middle of scapes; sepals ovate, obtuse, glandu- 

 lar-denticulate 2. L. pygmaea. 



Bracts linear, borne at surface of ground; sepals ovate, acute, entire, not 



glandular 3. L. nevadensis. 



Leaves shorter than the 2 to 4-flowered scapes; bracts and sepals denticulate, not 



glandular 4. L. oppositifolia. 



Scapes bearing a panicle of numerous flowers ; leaves in a tuft on the caudex crowning 

 a thick fleshy root; bracts and sepals ciliate-glandular. 



Flowers 5 to 7 lines long; leaves narrowly linear 5. L. leana. 



Flowers 2i to 3 lines long; leaves spatulate-obovate 6. L. cotyledon. 



Sepals and sepal-like bracts 4 to 8 ; flowers .large ; scapes 1-flowered. Subgenus EULEWISIA. 

 Scapes jointed just beneath the calyx, with two bracts at the joint which resemble the 2 

 sepals. 



Sepals glandular-denticulate 7. L. Tcelloggii. 



Sepals not glandular-denticulate 8. L. brachycalyx. 



Scapes jointed above the middle, with an involucre of 5 to 7 scarious subulate bracts; 

 sepals 6 to 8 9- L - rediviva. 



1. L. triphylla Kob. (Fig. 95a.) Scape half underground, arising from a 

 globose tuber about the size of a pea, 1 to 2 inches high and bearing a simple 

 or compound umb'ellate raceme subtended by 3 or 2 narrowly linear leaves; 

 umbel 3 to 14 (or 27) -flowered, or the flowers only 2 or 1 ; petals white, 5 

 to 7 or 10, subequal or unequal, 1% to* 2 lines long; stamens 4 or 5; styles 5 

 (4 or 3). 



