144 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Greene, Fl. Fran. 1: 68. 
IntusrrAtions: Wheeler's Exp. 4: pl. 3A. PLatn 83, f. 1-2; dissection of flower, 
jf. 3; pistil, f 4; stamens, f. 5; fruiting hypanthium and calyx, f. 6. 
Caudex from a deep woody root, erect, short and covered with brown scales. Stem 
strict, 1-2 dm. high, densely but finely hirsute. Stipules ovate, entire, 3-4 mm. long. 
Basal leaves numerous, less than 1 dm. long, densely hirsute, pinnate, with about 20 pairs 
of rather thick crowded leaflets, which are only 2-4 mm. long and divided almost to the 
base into 2-4 oval segments. Cyme narrow with upright branches. Hypanthium hirsute, 
cupulate or nearly campanulate; bractlets linear, about half as long as the lanceolate 
sepals. 
California: J.'T. Rothrock (Wheeler’s Exp.), No. 327, 18175 (Headwaters of Kern 
River). 
$8. UNGUICULATAE. 
31. Horkelia argyrocoma. 
ILLUSTRATIONS: PLATE 84, f. 1; dissection of flower, f. 2; stamen, f. 3; pistil, f. 4; 
fruiting hypanthium and calyx, f. 5. 
Root thick and deep, crowned by a short rootstock covered by brown hairy scales. 
Stems decumbent or ascending, slender, tinged with brown, silky-villous, the lower part, 
as well as the petioles, covered with long silvery spreading or reflexed hairs in a most 
beautiful manner. Stipules ovate-lanceolate, often toothed, about 5 mm. long. Basal 
leaves numerous, about .6 dm. long, densely white-silvery silky, of very numerous densely 
imbricated leaflets. Cymes dense, subcapitate. Hypanthium cupulate, silky, in fruit 
3 mm. in diameter; bractlets oblong, shorter than the ovate sepals. Petals white, spatu- 
late, a third exceeding the sepals. Stamens 20. 
It is a native of the San Bernardino Mountains of southern California, and differs 
from all the related species by the filaments, which are somewhat dilated. The habit and 
the structure of the flowers are otherwise almost identical with those of the two following, 
It cannot therefore be placed in Euhorkelia. Dr. Watson has labelled some specimens 
of this species Ivesia Reevesii, but the name was never published. Specimens: 
Califorma: &. B. Parish, No. 151, 1886 ;' No. 2362, 1892; No. 3187, 1894; No. 
3164, 1895; Parry & Lemmon, No. 104, 1876; S. B. & W. F. Parish, No. 151, 1882. 
32. Horkelia sericoleuca. 
Ivesia unguiculata Brewer & Wats. Bot. Cal. 1: 183. Mainly, as to description and 
Lemmon’s specimens. 1880. Not Gray. 
Rattan, An. Key W. Coast Bot. 52. 
