136 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



17. Horkelia fusca Lindl. 



Horkelia fusca Lindl. Bot. Reg. 23 : /. 1997. 1837. 



Dietr. Syn. PL 2 : 1628 ; Walp. Ann. 2 : 36 ; Presl, Epim. 198 ; Kegel. Act. Hort. 

 Petr. 1 : 152. 



Torr. & Gray, Fl. N. Am. 1 : 435 ; Hook, and Arn. Bot. Beechey's Voy. 338 ; Gray, 

 Proc. Am Acad. 6 : 529; Wats. King's Rep. 5 : 448; Brewer & Wats. Bot. Cal. 1 : 181; 

 Rattan, An. Key W. Coast Bot. 52; Howell, Fl. N. W. Am. 1 : 179. 



Potentllla Doiiglusii Greene, Pittonia, 1 : 103. 1887. 



Greene, Fl. Fran. 1 : 67. 



Illustrations: Lindl. Bot. Reg. 23: pL 1997; Plate 71, f. 1-2; dissection of 

 flower,/. 3; pistil,/. J^; stamens,/ 5; fruiting hypanthium and calyx,/ 6. 



Stem 2-6 dm. high, erect or ascending, often much branched, more or less glandular, 

 especially upward, often more or less tinged with brown or purple. Stipules ovate to 

 lanceolate, acute, more or less toothed, 1-2 cm. long. Basal leaves generally numerous, 

 1-2 cm. long, somewhat glandular-pubescent or glabrate; leaflets 5-7 pairs, obovate 

 or cuneate, toothed or incised toward the apex, .75-2 cm. long. Stem leaves similar but 

 with fewer leaflets. Leaves subtending the subcapitate cymes small, much shorter than 

 the heads. Hypanthium glandular-villous, cupulate, more or less tinged with brown or 

 purple ; bractlets linear, much shorter than the ovate-lanceolate sepals. Petals broadly 

 cuneate, about 3 mm. long and 2 mm. wide. 



This is the most common species of Horlcdia, growing throughout the larger part of 

 California and Oregon, and has also been collected in Idaho by L. F. Henderson, No. 

 3144, 1896. 



18. Horkelia tenella (Wats.) Rydb. 



Horkelia fusca var. teneUa Wats. Bot. Cal. 1 : 181. 1876. 



PokntUla Douglasii var. tenella Greene, Fl. Fran. 1 : 67. 1891. 



Horkelia tenella Rydb. Bull. Torr. Bot. Club, 25: 55. 1898. 



Howell, Fl. N. W. Am. 1 : 179. 



Illustrations: Plate 72, f. 1; dissection of flower, / 2; pistil,/ 3; stamens,/ 4.; 

 fruiting hypanthium and calyx, / 5. 



Perennial. Stem 1-3 dm. high, slender, erect and simple, more or less tinged with 

 red, often nearly glabrous below, densely glandular above. Stipules lanceolate, generally 

 with a few coarse teeth. Basal leaves numerous, pinnate, hirsute-puberulent and glandu- 

 lar or glabrate ; leaflets 5-10 pairs, .5-1 cm. long, cuneate or obovate in outline, divided 

 to below the middle or sometimes almost to the base into linear or linear-oblong segments. 

 Stem leaves few and similar; those subtending the subcapitate or sometimes quite open 



