24:8 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 



CLAYTONIA 



Perennials with thick roots or corms. 



Oorm globose; cauline leaves oblong I. C. lanceulata. 



Caudex elongate; cauline leaves linear-spatulate 2. C. megarrhiza. 



Perennials or annuals; roots not cormose. 



Stems bearing only two leaves, these opposite. 

 Cauline leaves not united. 



Pedicels mostly bractless ; perennial by rootstocks. 3. C. asarifolia. 

 Pedicels mostly with bracts; roots fibrous. 



Perennial, 10 to 50 cm. high; leaves ovate 4. C. sibirica. 



Annual, 5 to 15 cm. high; leaves narrow 5. C. arenicola. 



Cauline leaves united, at least at base. 



United leaves forming a roundish disk. 



Calyx 4 mm. long; seeds 2 mm. Ijroad. . . 6. C. ferfollata. 



Calyx 2 mm. long; seeds 1 mm. l)road. 



Basal leaves linear 7. C. jtarriflorn. 



Basal leaves ovate 7a. C. parrijlora depressa. 



United leaves not forming a disk, but linear or 



lanceolate 8. C. spathulata. 



Stems bearing more than two opposite leaves, or leaves . 

 alternate. 



Cauline leaves several pairs, opposite . 9. C. chamissoi. 



Cauline leaves alternate. 



Perennial, producing slender stolons; leaves very 



fleshy . - 10. C. parnfdia. 



Annual, not stoloniferous; leaves not very fleshy. 



Leaves broad, long-petioled ; seeds striate 11. C. diffusa. 



Leaves narrow, sessile. 



Seeds dull, less than 1 mm. broad 12. C. dichotorna. 



Seeds shining. 



Petals 4 mm. long; seeds 2 mm. 



broad 13. 6*. linearis. 



Petals minute or absent; seeds 1 mm. 



broad 14.6'. howellii. 



1. C laytonia lanceolata Pursh, Fl. 1: 175. 1814. \d.J^^ - 

 Type locality: "On the Rocky Mountains." Collected by Lewis, the exact place on 



the Lolo Trail, Bitterroot Moimtains, idaho. 



Range; Britisli Columbia to Wyoming and California. 



Specdiexs examined; Olympic Mountains, Piper 2228; Mount Rainier, Piper 2108; 

 Cascade Mountains, latitude 49°, LyaU in 1860; Goat Mountain, Allen 87; Cleman Moun- 

 tain, Henderson, June 14, 1892; Klickitat County, SuJcsdorf, June, 1878; Stevens Pass, 

 Sandberg cfc Leiherg 752; Simcoe Moimtains, Howell, June, 1879; Blue Mountains, Horner 

 63; Klickitat Hills, Gorman, April, 1895. 



Zonal distribution; Hudsonian and Canadian. ^ \ ^ 



2. Clajtonia me garrhiza (A. Gray) Parry; AVats. Bibl. Index 118. 1878. 

 Clayionia arc! tea megarrhiza A. Gray, Am. Journ. Sci. II. 33: 406. 1862. 

 Type LOCALITY : Rocky Mountains. Collected by PaiTy. 



Range; Washington to Alberta, Oregon, and Colorado. 



Specimens examined; Mount Stuart, Elmer 1224; Fish Lake, Dunn, August 4, 1900. 



3. Claytonia asarifolia Bong. Mem. Acad. St. Petersb. VI. 2: 137. 1832. 

 Claytonia cordifolia Wats. Proc. Am. Acad. 17: 365. 1882. 



Montia asarifolia Howell, Erythea 1 : 39. 1893. 



