MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 39 
22. Horkelia congesta Hook. 
Horkelia congesta Hook. Bot. Mag. 56: pl. 2880. 1829. 
Don, Gard. Dict. 2: 562; Dietr. Syn. Pl. 2: 1628; Walp. Rep. 2: 36; Regel, Act. 
Hort. Petr. 1: 153 (in part); Howell, Fl. N. W. Am. 1: 180. 
Hook. Fl. Bor. Am. 1: 196; Eat. Man. Ed. 7: 339; Eat. & Wr. N. Am. Bot. 273. 
Sibbaldia congesta Dietr. Syn. Pl. 2: 1020. 1840. 
Potentilla congesta Baillon, Hist. Pl. 1: 369. 1867-9. Greene, Pittonia, 1: 104. 1887. 
Intustrations: Hook. Bot. Mag. 56: pl. 2880; PuaTE 76, f. 1; dissection of 
flower, f. 2; pistil, f. 3; stamen, f. 4; fruiting hypanthium and calyx, f. 5. 
Stem from a short erect perennial rootstock, slender, strict, sparingly ciliate below, 
glabrous or finely puberulent above, 3-4 dm. high. Stipules pectinately dissected, the 
lower occasionally divided into linear segments as in the next section, Basal leaves pin- 
nate; leaflets 4 or 5 pairs, sparingly appressed-silky and ciliate, light green, thin and 
shining, linear-oblong, 1-1.5 em. long, entire, except at the very apex, where they are 
deeply 2-3-toothed, the teeth acute. Stem leaves smaller with linear leaflets. Cyme 
branched, with few upright branches, terminated by small subcapitate clusters of flowers. 
Hypanthium hemispheric, tinged with light brown, sparingly silky-villous, about 5 
mm. in diameter; bractlets linear-filiform, a little shorter than the ovate acuminate 
sepals. Petals broadly spatulate, yellowish, at least in the dry state, exceeding the sepals 
by one-half. Stamens 10; filaments all lanceolate. 
This species is intermediate between H. tridentata and H. hirsuta, with the latter of 
which it has been confused. The original description fits both, but Hooker’s plate was 
without doubt drawn from a specimen of this and not of the next. The few leaflets, 
slender stem and rather few flowers represented in the plate are those of the present spe- 
cies. It is a rare plant; the only specimens seen by me are the following: 
Oregon: Thomas Howell, 1881; 1884; No. 684, 1887. 
$s. HIRSUTAE. 
23. Horkelia hirsuta Lindl. 
Horkelia hirsuta Lind). Bot. Reg. 28: under pl. 1997. 1837. 
Horkelia congesta Torr. & Gray, Fl. N. Am. 1: 434. 1840." 
Hook. & Arn. Bot. Beechey’s Voy. 339; Gray, Proc. Am. Acad. 6: 529; Wats. 
King’s Rep. 5: 448; Torr. Wilkes’ Exp. 17: 288; Brewer & Wats. Bot. Cal. 1: 181; 
Rattan, An. Key W. Coast Bot. 52; Howell, Fl. N. W. Am. 1: 189, in part. 
Horkelia pilosa Nutt.; Torr. & Gray, Fl. N. Am, 1: 484. Assynonym. 1840. 
1 As to description, this citation and the following ones may also refer to the true H. congesta. 
