240 University of California Publications in Botany [Vol. 9 



9. GEUM 



Flowers yellow; styles jointed, the distal part deciduous 1. G. macrophyllum 



Flowers purple; styles not jointed, persistent and plumose 2. G. triflorum 



1. Geum macrophyllum Willd., Enum., p. 557. 1809. 



Type locality. — ' ' Camtschatca. ' ' 



Range. — Alaska to California and east to the Kooky Mountains; 

 Newfoundland and northern New England. 



Zone. — Transition and Canadian. 



Specimens examined. — About Marlette Lake, Washoe County, 2,460 

 m.. Baker 1387; King's Canon, Ormsby County, 1,700-2,000 m., Baker 

 1284; Twin Lakes, Alpine County, 8,500 feet, Hansen 1312; Sierra 

 County, Lemmon 731 ; trail to Castle Peak, 7,500 feet. Smiley 470. 



2. Geum triflorum Pursh., Fl. Am. Sept., vol. 1, p. 736. 1814. 



Sieversia triflora (Pursh.) R. Br., in Richards., Bot. App. Fraukl. Journ., 

 ed. 2, p. 21. 1823. 



Type locality. — "Upper Louisiana" (South Dakota). 



Range. — Widely distributed in North America : transcontinental 

 at the north ; on the Pacific Coast from British Columbia to California 

 and Arizona ; along the Rockies to Colorado. 



Zone. — Arid Transition and Canadian. 



Specimens examined. — Ridge south of Donner Pass, 8,500 feet, 

 Heller 7157 ; Sierra Nevada, Kellogg, July 12, 1870 ; Mt. Rose, C. L. 

 Brown, July 25, 1907; on a volcanic cone above Ebbett's pass, 8,500 

 feet, Brewer in 1863. 



The last collection furnished Dr. Greene the basis for Erythrocoma 

 canescens (Leaflets, vol. 1, p. 178. 1906), for the acceptance of which, 

 no adequate reasons were advanced at the time of publication or have 

 since been proposed; see C. P. Smith.^^^ 



10. HORKELIA 



Sepals becoming reflexed; stamens about 20 1. H. purpurascens 



Sepals not becoming reflexed; stamens about 10. 



Leaflets 10-16; hypanthium glandular and purplish 2. H. fusca 



Leaflets 4-8; hypanthium silky but scarcely glandular, and green 



3. H. tridentata 



1. Horkelia purpurascens Wats., Proc. Am. Acad., vol. 11, p. 

 148. 1876. 



Potentilla purpurascens Greene, Pitt., vol. 1, p. 105. 1887. 

 HorJceliella purpurascens Rydb., N. Am, Fl., vol. 22, p. 282. 1908. 



Type locality. — "On the headwaters of Kern River, at 9,000 feet 

 altitude. ' ' 



