MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 205 



California : S. B. Parish, No. 1818, 1886, from the San Bernardino Mountains. 



13- CHAMAERHODOS Bunge. 



Sibbaldia L. Sp. PL 284. In part. 1753. 



Chamaerhodos Bunge, in Ledeb. Fl. Alt. 1: 429. 1829. 



Hypanthium cup- shaped, small. Petals and sepals 5 ; bractlets wanting. Petals 

 obovate or cuneate, somewhat clawed. Stamens 5, opposite the petals ; filaments subu- 

 late, short, persistent; anthers didymous, opening by a slit. Pistils 5-10, or more; style 

 basal, filiform. Seed inserted near the base of the style, ascending and nearly orthot- 

 ropous. 



Small biennial or perennial, branching plants, generally glandular-pubescent and 

 with finely dissected leaves and dichotomous cymes. The genus consists of about half 

 a dozen species, all natives of Northern Asia, one also extending into northwestern 

 America. 



I. Chamaerhodos erecta (L.) Bunge. 



Sibbaldia erecta L. Sp. PL 284. 1753. 



Sp. PL Ed. 2: 407; Willd. Sp. PL 1: 1567; Pers. Syn. PL 1: 341; Spreng. Syst. 

 1: 956 ; DC. Prod. 2 : 587 ; Poem. & Schult. Syst. 6 : 769; Dietr. Syn. PL 2 : 1020; 

 Pursh, Fl. Sept. Am. 211. 



Chamaerhodos erecta Bunge, in Ledeb. Fl. Alt. 1: 430. 1829. 



Don, Gard. Diet. 2 : 562 ; Walp. Rep. 2 : 37 ; Ledeb. Fl. Ross. 2 : 33. 



Torr. & Gray, Fl. N. Am. 1: 433; Torr. Nicol. Rep. 149; Gray, Pac. R. R. Rep. 

 12: 43; Proc. Acad. PhiL 1863: 61; Porter, Hayd. Rep. 1871: 481; Porter & Coult. 

 FL Col. 35; Coult. Man. Rocky Mts. 86; Rothrock, Bot. Wheeler Surv. 114. 



Sibbaldia erecta var. parviflora Nutt. Gen. 1: 207. 1818. 



Eat. & Wr. N. Am. Bot. 424. 



Chamaerhodos erecta var. Nuttallii Torr. & Gray, Fl. N. Am. 1: 443. 1840. 



Illustrations : Lam. 111. pi. 221, f. 2 ;^ Amman, Ruth. pi. 15. Plate 112, f. 6 ; dis- 

 section of flower, /. 7 ; pistil, /. 8 ; stamen, /. 9 ; fruiting hypanthium and calyx, /. 10. 



Plant 1-3 dm. high, erect, branching and leafy, hirsute and glandular. Basal 

 leaves numerous and rosulate, 2-4-ternately divided into linear or oblong divisions. 

 Stem leaves also numerous, similar but smaller and less divided. Hypanthium 2-3 

 mm. in diameter, hispid ; sepals narrowly lanceolate, equalling or somewhat shorter than 

 the white obovate-cuneate petals. 



Rather common on the dry plains of northwestern America from Saskatchewan to 

 South Dakota, Wyoming and northwestward. Also common in Siberia. 



