144 MEMOIRS FROM TELE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Greene, Fl. Fran. 1: 68. 



Illustrations : Wheeler's Exp. 4 : pi. 3 A. Plate 83, f. 1-2; dissection of flower, 

 /. 3; pistil,/. ^; stamens,/. 5 ; fruiting hypanthium and calyx,/. 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 Unear, about half as long as the lanceolate 

 sepals. 



California : J. T. Rothrock (Wheeler's Exp.), No. 327, 1875 (Headwaters of Kern 

 River). 



§8. UNGUICULATAE. 



31. Horkelia argyrocoma. 



Illustrations : Plate 84, f. 1 ; dissection of flower, / 2; stamen, /. 3 ; pistil, /. 4 ; 

 fruiting hypanthium and calyx, /. 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 .5 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 fllaments, 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 : 



California: S. B. Parish, No. 151,1886; No. 2362,1892; No. 3137,1894; No. 

 3764, 1895; Parry & Lemmon, No. 104, 1876; S. B. & W. F. Parish, No. 151, 1882. 



32. Horkelia sericoleuca. 



Ivesia ungmculata Brewer & Wats. Bot. Cal. 1 : 183. Mainly, as to description and 

 Lemmon's specimens. 1880. Not Gray. 

 Rattan, An. Key W. Coast Bot. 52. 



