136 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
17. Horkelia fusca Lindl. 
Horkelia fusca Lind). Bot. Reg. 23: ¢. 1997. 1837. 
Dietr. Syn. Pl. 2: 1628; Walp. Ann. 2: 36; Presl, Epim. 198; Regel. Act. Hort. 
Petre ds 152. 
Torr. & Gray, Fl. N. Am. 1: 485; Hook. and Arn. Bot. Beechey’s Voy. 338; Gray, 
Proc. Am Acad. 6: 529; Wats. King’s Rep. 5: 448; Brewer & Wats. Bot. Callas Lov: 
Rattan, An. Key W. Coast Bot. 52; Howell, Fl. N. W. Am. 1: 179. 
Potentilla Douglasii Greene, Pittonia, 1: 108. 1887. 
Greene, Fl. Fran. 1: 67. 
Innustrations: Lindl. Bot. Reg. 23: pl. 1997; Puats 71, f. 1-2; dissection of 
flower, f. 3; pistil, f. 4; stamens, f. 5; fruiting hypanthium and calyx, f. 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 em. long. Basal leaves generally numerous, 
1-2 am. long, somewhat glandular-pubescent or glabrate; leaflets 5-7 pairs, obovate 
or cuneate, toothed or incised toward the apex, .75-2 em. 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 Horkelia, 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. tenella Wats. Bot. Cal. 1: 181. 1876. 
Potentilla Douglasii var. tenella Greene, Fl. Fran. 1: 67. 1891. 
Horkelia tenella Rydb. Bull. Torr. Bot. Club, 25: Ray ws llicehes 
Howell, Fl. N. W. Am. 1: 179. 
Intustrations: Puare 72, f. 1; dissection of flower, f. 2; pistil, f. 3; stamens, pons 
fruiting hypanthium and calyx, f. 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 
